Abstract At present, it is generally considered in the analysis of the secondary motion of engine piston that the piston skirt–cylinder liner friction pair is fully lubricated in an engine operating cycle. However, in practice, when the piston moves upward, the amount of lubricating oil at the inlet may not ensure that the friction pair is fully lubricated. In this article, the secondary motion of piston is studied when the transport of lubricating oil is considered to determine the lubrication condition of piston skirt–cylinder liner friction pair. The secondary motion of piston is solved based on the combined piston motion model, hydrodynamic lubrication model, asperity contact model, and lubricating oil flow model. The secondary motion equation of piston is solved by the Broyden method. The hydrodynamic lubrication equation is solved by the finite difference method. The asperity contact between piston skirt and cylinder liner is calculated by the Greenwood model. The flow of

Liu, Jihai, Sun, Jun

Simulation Study on EGR Condensate Flow and Uniformity of Each Cylinder in the Intake Manifold

2023-01-703410/30/2023

As engine technology developed continuously, engine with both turbocharging and EGR has been researched due to its benefit on improving the engine efficiency. Nevertheless, a technical issue has raised up while utilizing both turbocharging and EGR at the same time: excess condensed water existed in intake manifold which potentially trigger misfire conditions. In order to investigate the root-cause, a CFD model (conducted by CONVERGE CFD software) was presented and studied in this paper which virtually regenerated intake manifold flow-field with EGR condensed water inside. Based on the simulated results, it concluded that different initial conditions of EGR condensed water could significantly change the amount of water which deposited in each cylinder. Thus, a coefficient of variation of deposited condensed water amount among these cylinders, was marked as the evaluation reference of cylinder misfire. Theoretically, as this coefficient of variation reduced, the EGR condensed water from

Pan, Shiyi, Li, Guanting, Wang, Jinhua, Zhang, Nan, Xu, Zhiqin, Chen, Shanghua, Chen, Jun, Zhao, Shengwei

Simulation Study on the Effect of In-Cylinder Water Injection Mass on Engine Combustion and Emissions Characteristics

2023-01-700410/30/2023

The rapid development of the automobile industry has brought energy and environmental issues that scholars are increasingly concerning about. Improving efficiency and reducing emissions are currently two hot topics in the internal combustion engine industry. Direct water injection technology (DWI) can effectively reduce the cylinder temperature, which is due to the absorption of the heat by the injecting liquid water. In addition, lower temperature in the cylinder will reduce the formation of NO. In this paper, a CFD simulation of DWI application in a lean-burning single-cylinder engine with pre-chamber jet ignition was carried out. And the engine was experimentally tested for the simulation model validation. And then the effect of DWI strategy with different injecting water mass on the combustion and emissions characteristics are analyzed. Physically, injected water not only absorbs heat but also provides heat insulation. The results are shown under the rotating speed of 2800 r/min

Guan, Jun, Shang, Quanbo, Hu, Yinuo, Lu, Ye, Li, Liguang, Deng, Jun

3DCFD-Modeling of a hydrogen combustion-process with regard to simulation stability and emissions

2023-01-120906/26/2023

Author and Co-authors: M.Sc. Aristidis Dafis (IMS), Prof. Dr.-Ing. Hermann Rottengruber (IMS), Dr.-Ing. Paul Jochmann (Robert Bosch GmbH), Dr.-Ing. Erik Schünemann (Robert Bosch GmbH) Abstract: In the context of the energy transition, CO2-neutral solutions are of enormous importance for all sectors, but especially for the mobility sector. Hydrogen as an energy carrier has therefore been the focus of research and development for some time. However, the development of hydrogen combustion engines is in many respects still in the conception phase. Automotive system providers and engineering companies in the field of software development and simulation are showing great interest in the topic. In a joint project with the industrial partners Robert Bosch GmbH and AVL Germany, combustion in a H2-DI-engine for use in light-duty vehicles was methodically investigated using the CFD tool AVL FIRE®. The collaboration between Robert Bosch GmbH and the Institute for Mobile Systems (IMS) at Otto von

Dafis, Aristidis, Rottengruber, Hermann, Jochmann, Paul

Investigation of spark plug and passive pre-chamber ignition on a single-cylinder engine with hydrogen port fuel injection

2023-01-120506/26/2023

The race towards zero carbon emissions is ongoing with the need to reduce the consumption of fossil energy resources. This demands immediate and reliable developments regarding technical environmentally friendly solutions for the power and transportation sectors. An alternative way to achieve a carbon-free powertrain is the use of green hydrogen for internal combustion engines. Operating a hydrogen-fuelled engine offers many opportunities as well as challenges that need to be addressed. In this work the self-designed Fraunhofer single cylinder engine with a displacement volume of 500 cm³ derived for extreme lean combustion and passive pre-chamber ignition was adapted for hydrogen engine operation. With hydrogen combustion, the customized cooling system resulting in low metal temperatures is simulated and optimized to avoid hot spots in the combustion chamber. The basic engine setup being investigated on the test bench contains a compression ratio of 12.2, port fuel injection and a

Bucherer, Sebastian, Rothe, Paul, Sobek, Florian, Gottwald, Theo, Kraljevic, Ivica, Vacca, Antonino, Gal, Thomas, Chiodi, Marco, Kulzer, Andre

A fast and reliable CFD approach to design hydrogen SI engines for industrial applications

2023-01-120806/26/2023

SI engines fueled with hydrogen represent a promising powertrain solution to meet the ambitious target of carbon-free emissions at the tailpipe. Therefore, fast and reliable numerical tools can significantly support the automotive industry in the optimization of such technology. In this work, a 1D-3D methodology is presented to simulate in detail the combustion process with minimal computational effort. First, a 1D analysis of the complete engine cycle is carried out on the user-defined powertrain configuration. The purpose is to achieve reliable boundary conditions for the combustion chamber, based on realistic engine parameters. Then, a 3D simulation of the power-cycle is performed to mimic the combustion process. The flow velocity and turbulence distributions are initialized without the need of simulating the gas exchange process, according to a validated technique. However, coupled 1D-3D simulations of the engine scavenging can be carried out as well to increase the accuracy of the

Ramognino, Federico, Sforza, Lorenzo, Cerri, Tarcisio, Lucchini, Tommaso, Onorati, Angelo, Novella, Ricardo

Noise Reduction in High-Speed Sonic Under expanded jets using Slanted Perforated Tabs

2025-01-003205/05/2023

Studies on High-Speed Jet control is of prime importance to aerospace as well as related industries. Proper mixing of Jet of a fuel with the surrounding air is indispensable in the combustion chamber of a propulsive system, this contributes to the need of enhancing mixing of Jet with ambient air. The noise radiated by a jet engine is also a major problem for many cities around the world and this method also reduces the Jet associated noise which is of immense environmental concern for transport aircrafts. The High-speed Jet control is achieved by using two different methods. They are active Control method and passive control method. In active control method, the idea is to introduce stream wise vortices into the mixing layer of the jet. Passive control of the jet can be achieved by adding geometrical modifications. The present study deals with an innovative passive control of jet using slanted perforated tabs. which focuses on the method of changing the structures in turbulent free

R, Asad Ahmed, SUBRAMANIAN, THANIGAIARASU

Indirect blocked force measurement of a hydraulic power pack for structural vibration transmission into an airframe

2025-01-005205/05/2023

Centralization of electrically driven hydraulic power packs into the body of aircraft have increased the attention on the noise and vibration characteristics of the system. A hydraulic power pack consists of a pump coupled to an electrical motor, accumulator, reservoir, and associated filter manifolds. In previous studies, the characteristics of the radiated acoustic noise and fluid borne noise were studied. In this paper, we focus on the structure borne forces generated by the hydraulic pump characterized through blocked force measurements. The blocked force of the pump was determined experimentally using an indirect measurement method. The indirect method required operation with part under test fixed to an instrumented receiver structure. Measured operational accelerations on the receiver plate were used in conjunction with transfer function measurements to predict the blocked forces. Blocked forces were validated by comparing directly measured accelerations to predicted

Smither, Matthew, Tuyls, Zachary, Patel, Pratik, Yan, Xin, Herrin, David

Optimization of HEV Vehicle’s Engine Modulated Noise

2025-01-008405/05/2023

One 1.5L Miller-cycle turbocharged four cylinder gasoline hybrid engine is installed on a certain hybrid vehicle. When accelerating at low to medium speeds with a small throttle, there is a "da da" knocking noise inside the car, which seriously affects the overall sound quality of the vehicle. By analyzing the vibration and noise data of the engine, it was found that the frequency of the abnormal knocking sound is 200-1000Hz, which presents a half order characteristic in the time domain, that is, one knocking occurs when the engine crankshaft rotates twice. Through Hilbert demodulation analysis of the vibration data in the problem frequency range, it was found that the knocking noise was modulated in the frequency domain, with a modulation frequency of half of the crankshaft rotation frequency. By building a fully flexible multi-body dynamic model of a hybrid powertrain and inputting the engine's cylinder pressure excitation, the combustion excitation is coupled with mechanical

dan, Kong

Design, Fabrication, and Analysis of Vertical Press Cut Machine

2022-28-048311/18/2022

This study involves the design, fabrication, and analysis of a vertical press-cut machine (henceforth machine*) to cut wooden plates of 1mm thickness to directly produce an output of the required shape and dimension in one press. The aim is to manufacture a machine that could be portable, cost less (also includes operating costs and labor costs) and be able to produce outputs of any dimensions and shapes. This machine operates on the principle of slider crank mechanism which utilizes a slider, a connecting rod, and a crank. The necessary punch force required in this study to shear a wooden plate of 1mm thickness completely, is 3198 N. This necessary downforce is achieved by fabricating a die of mass 2kg with Mild Steel material and attaching 4 stainless steel blades (total mass = 0.68 kg) with 2mm allowance to the die using eight 12mm bolts. This die is bolted (8mm diameter) to a mild steel plate (150*60*6: l*b*t) which acts as the connecting rod in this setup, which is then bolted

S, Ravindran, Renganathan, Srikanth, D, Venkatragavan, S, Sundar, R, Steephan Raj, Sadhasivam, Navin

Determine Torque Plate Tightening Torque Strategy to Achieve Low Bore Distortion for Diesel Engine

2022-28-049011/18/2022

There is a two-step migration in the Indian automotive industry from Bharat stage IV to Bharat stage VI emission norms. This emission regulatory migration demands substantial engineering efforts to design, develop and validate engine, engine components, and complete exhaust after-treatment system. In this context, cylinder bore distortion plays a vital role in engine blow-by, oil consumption, and its effect on DPF ash loading. For Bharat stage VI engines, overall thermal loading is increased which exerts higher mechanical & thermal stresses over the engine and subsequent components. Increased engine bore distortion has ill effects on the engine and after-treatment devices. Reduction of bore distortion helps piston rings to confirm with the bore, which results in low oil passing through rings towards the combustion chambers which finally results in low oil burn off in the combustion chamber. In the present work, the study was conducted to reduce cylinder bore distortion by various

Bodake, Rajendra, Mahajan, Pratik, Thakur, Anil, Vaidya, Omkar

An experimental study to understand the effect of calibration parameters and operating conditions on piston and cylinder bore temperatures for a multi-cylinder DI diesel engine through piston telemetry.

2022-28-048511/18/2022

There is a huge shift in Indian emission standards and that had made a huge impact on engineering work allied with engines and their AFT devices. The piston is most loaded with thermomechanical stresses and early detection of failure can save much time, cost and overall organization can focus to make more robust, technically fit, and reliable products to market. So, it is important to know the effect of engine operating conditions on power cylinder components and other related systems during the development phase of an engine. The operating temperatures are known to be affected by various calibration/control parameters relating to sub-systems like air handling, injection, and cooling systems. These are often tuned based on performance and emission requirements. In this work, a detailed experimental investigation has been reported about the effect of key calibration parameters and boundary conditions on the temperatures of the power cylinder components of a multi-cylinder medium-duty DI

Chaudhari, Priyanka, Thakur, Anil, Chila, Shreepal, Paygude, Sachin, More, Rahul Shriram, Rohokale, Dilip

Design and Thermal Analysis of Intake Manifold and Investigation of Charge Motion in CI Engine

2022-28-044311/09/2022

It is close important so much a suitably designed consumption flatulence manifold is vital because the top-of-the-line performance concerning an IC Engine. This venture offers with the three-D simulation regarding a device yet the outcomes wish stand mentioned using computational softened dynamics (CFD) analysis. For foremost IC engine performance, airflow intimate the consumption miscellaneous is some regarding the necessary factors. The atmosphere rate is brought on at some point of the intake blow then another altered all through the suppression process, and the kinetic power on the fluid consequential between swirl and turbulence reasons quick mixing about gasoline yet wind inward the cylinder. Therefore, it is entirely a lot integral in conformity with recognize the in-cylinder fluid rate thoroughly. So up to expectation the version among special parameters certain namely drift coefficient, swirl coefficient, swirl velocity, swirl ratio, then version about stubborn electricity at

Deepan Kumar, Sadhasivam, A, Tamilselvan, M, Vignesh, P, Somasundaram, Singaravel, M

A Model-Based Investigation of Electrically Split Turbocharger Systems Capabilities to Overcome the Drawbacks of High-Boost Downsized Engines

2022-01-505207/20/2022

Engine downsizing is one the most common methods of coping with strict emission regulations. However, it must be coupled with complementary systems so that the engine performance would meet the standards. That is why new efficient solutions can pave the way toward this goal. The electric forced-induction system (EFIS) is the emerging replacement for conventional forced-induction systems (FIS), namely, turbochargers and superchargers. The reason behind this replacement is the drawbacks associated with FIS, among them are turbo lag and inefficiency in exhaust gas energy recycling. Electrically split turbocharger (EST) is a form of EFIS which offers a great potential for engine downsizing. In this paper, a new approach to EST utilization for lowering the fuel consumption (FC) without compromising performance has been introduced, through which the augmented degree of freedom enabled by an EST is used to optimize the air-charge boosting. To show the effectiveness of the proposed method, a

Kouhyar, Farzad, Nikzadfar, Kamyar

Design and Simulation of Isolated AC-DC Flyback Conversion System for High Energy Ignition Unit of Gas Turbine Engine

2022-26-118705/26/2022

A high energy ignition system is used in the gas turbine engine to provide desired heat energy which ignites the fuel and compressed air passing through the combustion chamber. The high energy output of the ignition system depends on the suitable selection of converter mechanism. Therefore, an AC-DC fly back converter mechanism is used in the exciter unit which supplies high input voltage (3000V) to the gas discharge tube.This converter design provides input and output side electrical isolation and assures the safety of the system. Also, by incorporating this circuit with the ignition coil, the desired output of 3-6 joules and spark rate of 200 to 350 micro seconds can be achieved. This paper discusses the procedures involved in the design and simulation of fly back conversion mechanism for high energy ignition unit.

J, Abarna, Kumari, Poonam, AN, Vishwanatha

Hydrogen Fueled Aircraft Engines

2022-26-115605/26/2022

In the recent years, the climate change has become more devastating, and its continuing use of fossil fuels seems unreasonable as humankind is being pushed into a corner where the need to choose an alternative fuel has become necessary. The two main alternatives currently available are: Electrical propulsion and Hydrogen injected air breathing engines. Electrical propulsion had come far since last 10 years with Li+ ion technology, but the problem with them persists. They provide a low power to weight ratio which reduces the range as well as the load while operating the aircraft. On the other hand, Hydrogen with fuel cells or H2-O2 combustion has a high power to weight ratio but very difficult to handle. So, using hydrogen comes with a lot of difficulties in the present scenario. However. the concept of hydrogen has come a long way since its first use as a Rocket fuel. But this alternate fuel provides many advantages as well as challenges which needs to be overcome to move on its use in

Sri, Ratan, Sivamani, Seralathan

Parameters Optimization of a Double Gyroscope Concept for a Two-Wheel Vehicle

15-15-02-0009

04/20/2022

Abstract The concept of making a two-wheeled self-stabilizing vehicle can be a possibility soon. These vehicles use control moment gyroscopes (CMGs) to provide enough torque for the vehicle to prevent it from rolling and falling to the ground. CMGs can be used with different numbers and configurations. In this article, the aim is to offer a design procedure for a double gyroscope system, which can be used for any two-wheel vehicle to be self-stabilized. The procedure is based on using optimization algorithms in reaching the optimum double gyroscope configuration for a certain two-wheel vehicle to reach a zero-degree roll angle in the least time possible, which is the novel part of the procedure. A design procedure for a double gyroscope with the yaw axis as a spinning axis for a two-wheel vehicle is offered. This procedure has been tested for both a small two-wheel robot and a two-wheel enclosed vehicle. The research method started with a presentation of motion equations, followed by a

Aboelsaoud, Mostafa, Taha, Ahmed Abdelsalam, Mabrouk, Mohamed Yasser, Aboelazm, Mohamed, Elgamal, Hassan

Parameters Optimization of a Double Gyroscope Concept for a Two-Wheel Vehicle

15-15-02-0009-TEST-REC04/20/2022

Aboelsaoud, Mostafa, Taha, Ahmed Abdelsalam, Mabrouk, Mohamed Yasser, Aboelazm, Mohamed, Elgamal, Hassan

The Rotating Liner Engine under Medium Loads and Speeds. Fuel economy benefit exceeds 10%

2022-01-050703/29/2022

The Rotating Liner Engine (RLE) is a design concept where the cylinder liner of a Heavy Duty Diesel engine rotates by about 2-4 m/s surface speed in order to eliminate the piston ring and skirt boundary friction near top and bottom dead center. Based on testing results from our single cylinder RLE prototype (a converted four cylinder Cummins ISB 3.9 diesel) compared to a similar baseline, under idle conditions, the friction reduction is approximately 50 kPa in FMEP (friction mean effective pressure), which translates to about 40% for a complete engine. In this new set of experiments, we are comparing the RLE performance under load of up to about 7 bar IMEP (indicated mean effective pressure). It has been proven that the elimination of metallic contact between the compression rings and cylinder persists under up to 75 bar peak cylinder pressure and 1.5-2 m/s liner surface speed (283-383 rpm) for the 850-1150 rpm crankshaft speed. Additionally, the RLE FMEP is substantially reduced under

Dardalis, Dimitrios, ALHAJ ASAD, Osama, Basu, Amiyo, Hall, Matthew, Matthews, Ron

A Comparison of Isobaric and Conventional Diesel Combustion using High-Speed Optical Imaging

2022-01-049903/29/2022

Isobaric combustion can achieve higher thermal efficiency, lower heat transfer losses, and NOx emissions compared to conventional diesel combustion (CDC). Previous studies on isobaric combustion provided a detailed analysis of performance/emissions characteristics with a limited emphasis on the fuel-air mixing process, high-temperature reaction, and soot formation zones. In the present study, high-speed imaging of Mie-scattering, CH* chemiluminescence, and soot luminosity were conducted in an optically accessible single-cylinder heavy-duty diesel engine for CDC and isobaric combustion. The fuel used for both the combustion modes is n-heptane, which is a surrogate of diesel fuel. The engine was equipped with a flat-bowl shaped optical piston to allow bottom-view imaging of the combustion chamber. The peak cylinder pressure (PCP) and the fuel mean effective pressure (Fuel MEP) for both the combustion modes are kept as 70 bar and 19 bar, respectively. For a given combustion mode, the

Panthi, Niraj, Goyal, Harsh, Magnotti, Gaetano

Frontloading of cam bearing friction and lubrication assessment through EHD analysis

2022-01-076803/29/2022

One of the key thrust areas in engine design and development is achieving friction reduction between rotating parts in engine bearings. Valvetrain and cam bearing friction losses contribute to around 15% of all friction losses. Inline to cranktrain bearings, cam bearings are also supplied oil through oil gallery. Hence, cam bearings also operate under mixed lubrication regime. There is an opportunity to frontload cam bearing assessment through EHD simulation with similar approach as in cranktrain EHD modeling. This paper discusses about simulation methodology developed for cam bearing EHD in AVL Excite Powerunit. Crantrain dynamic model has been extended by appending complete valvetrain dynamic model. A substructure of camshaft has been used to drive valvetrain. Engine is also defined as a substructure with retained nodes at cam bearing interface. These nodes are connected to camshaft using EHD joints. Timing of each cam has been defined to allow synchronous valve opening and closure

Bhattacharya, Anup

An experimental study of heat loss and spatially temperature distributions of the impinging plate

2022-01-060703/29/2022

Spray impingement tends to occur in compact-size engines and it affects the fuel-air mixing, local heat transfer between fluid and solid, and possibly leads to fuel deposition on the hard surface. The deposits which are typically called “film” become one of the main sources of soot particles generated in the subsequent combustion. Wall temperature is one of the factors that affect fuel deposition. A higher wall temperature would enhance the film evaporation and reduces the risks of fuel deposition to partially avoid the soot particles formed from the film. Also, the wall temperature would affect the ignition characteristics such as ignition delay and ignition location. However, in realistic operating engines, the wall temperature is not consistent but changed by the heat conduction from charge gas and heat convection when the spray hits the wall and propagates near the surface. Due to the arrangement of injectors in the engines, an oblique injection is typically observed. This scenario

Zhao, Zhihao, Lee, Seong-Young

Analysis of Gasoline Engine Piston for Carbon Fiber Material

2022-01-040603/29/2022

In the present study, an automotive gasoline engine piston was designed and its various structural and thermal properties were analyzed for three different materials, namely, Gray Cast Iron, Aluminum Alloy, and Epoxy Carbon Woven (230 GPa) Prepreg. The design was done on SolidWorks 2019 and the analysis was carried out on ANSYS v18.1. The lightweight of the Epoxy Carbon Woven (230 GPa) Prepreg piston as compared to the other two pistons suggests that the inertial forces are reduced for the carbon fiber material. It is also observed that the structural strength of the Epoxy Carbon Woven (230 GPa) Prepreg material piston is more than that of Gray Cast Iron, and Aluminum Alloy piston. The temperature variation for the Epoxy Carbon Woven (230 GPa) Prepreg piston is less than that of the Gray Cast Iron and Aluminum Alloy piston, thus giving it a better thermal conductivity. The heat flux for the Gray Cast Iron and Aluminum Alloy pistons is greater than that of Epoxy Carbon Woven (230 GPa

Jain, Devanshu, Paul, Shourya, Brella, Rohan, Kumar, Naveen

Novel Micro bowls combustion chamber piston for Diesel engines

2022-01-054103/29/2022

Pollution is a major concern in India, Government has moved to BS-VI emission norms in 2020 across the country directly from BS-IV skipping BS-V. Exhaust emissions are the non-useable gaseous waste products produced during the combustion process. "Exhaust gas" is the standard term used to describe the waste gas from internal combustion engines. In addition to harmless products such as water vapor, carbon dioxide and nitrogen, engine exhaust also contains pollutants, which are harmful to humanity and the environment: carbon monoxide (CO), hydrocarbons (HC) and nitrogen oxide (NOx). Exhaust emission can be controlled broadly into two category, 1) Before Combustion: Air fuel control equipment. 2) After combustion: After treatment equipment. In these both areas, much of work has been done so far to achieve BS-VI emissions. However, one spot left out, meeting of these two categories is combustion chamber. In this paper, novel approach has been tried out, whether after treatment cost can be

Hipparagi, Shivanand Guruling

A Numerical Study on the Effect of a Pre-Chamber Initiated Turbulent Jet on Main Chamber Combustion

2022-01-0469

03/29/2022

To elucidate the complex characteristics of pre-chamber combustion engines, the interaction of the hot gas jets initiated by an active narrow throated pre-chamber with lean premixed CH4/air in a heavy-duty engine was studied computationally. A twelve-hole KAUST proprietary pre-chamber geometry was investigated using CONVERGE software. The KAUST pre-chamber has an upper conical part with the spark plug, and fuel injector, followed by a straight narrow region called the throat and nozzles connecting the chambers. The simulations were run for an entire cycle, starting at the previous cycle's exhaust valve opening (EVO). The SAGE combustion model was used with the chemistry modeled using a reduced methane oxidation mechanism based on GRI Mech 3.0, which was validated against in-house OH chemiluminescence data from the optical engine experiments. Two different piston geometries, a flat piston geometry, and a more realistic bowl piston geometry were studied to understand the influence of jet

Sanal, Sangeeth, Echeverri Marquez, Manuel, Silva, Mickael, Cenker, Emre, Im, Hong G.

Development of numerical framework for research of the pre-chamber SI combustion

2022-01-046103/29/2022

A promising strategy for increasing thermal efficiency and decreasing emissions of a spark ignited (SI) internal combustion engine is the application of the lean mixtures. The flammability limit of lean mixtures can be increased by using an active pre-chamber containing an injector and a spark plug, resulting in a combustion mode commonly called Turbulent Jet Ignition (TJI). The optimization of combustion chamber shape and operating parameters for TJI combustion can be a demanding task since the number of design parameters is significantly increased and is today supported by numerical simulations. In this paper, the process of development of numerical framework based on 3D CFD and 1D/0D numerical models that will support the research of the pre-chamber design and optimization of operating parameters will be shown. For 3D CFD modelling the AVL Fire™ code is employed where the full combustion chamber model with intake and exhaust ports of the experimental engine is prepared. In the pre

Krajnovic, Josip, Dilber, Viktor, Sjeric, Momir, Tomic, Rudolf, Vucetic, Ante, Kozarac, Darko

Performance, Emission, and Combustion Characteristics of Semi-adiabatic Compression Ignition Engine fuelled with Waste Cooking Oil Methyl Esters and Diesel Blend.

2022-01-062103/29/2022

The utilization of energy produced in an internal combustion (IC) engine plays a key role in improving the engine performance. Thermal Barrier coating (TBC) is one of the effective engines modification methods to utilize the energy effectively in an IC engine. The alternative fuels with very poor fuel properties can be fuelled successfully in a TBC mode. In this study, an investigation was carried out in a TBC, single-cylinder, diesel engine fuelled with waste cooking oil-diesel blend. In the first phase, the waste cooking oil methyl ester (WCOME) is fuelled in the standard engine for the performance, combustion, and emission characteristics. In the second phase, the WCOME blend with diesel to an appropriate percentage of 20% by volume (WCOMEB20) and tested in the standard engine for the characteristics. In the third phase, the standard engine is converted to TBC mode. The engine combustion chamber components such as Piston crown, cylinder head, inlet, and exhaust valve were coated

Elumalai, Sangeethkumar, Mayakrishnan, Jaikumar, Velmurugan, Ramanathan

Laminar flame speed measurements of propane/DME/air mixtures

2022-01-062403/29/2022

An experimental study on the laminar flame speeds (LFS) of premixed propane/dimethyl-ether (DME)/air flames was conducted inside a constant-volume chamber at UCF. Mixtures of propane and DME were selected for this study as they show promise as a fuel source that can be utilized in the automotive diesel industry as a low emission alternative fuel. The LFS of a fuel mixture is a key characteristic of combustion for its application in the design process of engines, as it can be used as a metric for fuel performance. Further underscoring the importance of gathering LFS data for these mixtures is its use in validating chemical kinetic mechanisms that can be utilized for further research in the field. LFS is dependent on fuel/oxidant mixture temperature, pressure, and equivalence ratio. While some studies exist examining other characteristics of combustion with regards to propane/DME fuel mixtures, there is minimal information pertaining to the laminar flame speed of the mixtures. This study

Weiner, Joshua, kim, Gihun, Ghorpade, Ritesh

Items per page:

1 – 50 of 8887