Browse Topic: Superchargers

Items (59)

Detailed Combustion Analysis of a Supercharged Double-Fueled Spark Ignition Engine

03-15-04-002611/10/2021

The main goal of researches in the field of automotive engineering is to obtain a large-scale implementation of low- or zero-emissions vehicles in order to substantially reduce air pollution in urban areas. A fundamental step toward this green transition is represented by the improvement of current internal combustion (IC) engines in terms of fuel economy and pollutant emissions. The spark ignition (SI) engines of modern light-duty vehicles are supercharged, down-sized, and equipped with direct injection. Gaseous fuels, such as liquefied petroleum gas (LPG) or natural gas (NG), proved to be a valid alternative to gasoline in order to reduce pollutant emissions and increase fuel economy. In previous works the authors investigated the simultaneous combustion, in an SI engine, of gasoline and a gaseous fuel (referred to as Double-Fuel operation, DF) both in the naturally aspirated and supercharged version; a significant increment of engine efficiency and a great reduction of pollutant

Beccari, Stefano, Pipitone, Emiliano

Experimental Evaluation of Steady State Performance of an Automotive Electric Supercharger

2020-37-000806/23/2020

Nowadays, the electric supercharger for turbocharged downsized automotive engines is mainly used to improve torque at low engine speeds in order to obtain an improvement of the time to boost. These components are usually designed to fill the gap in terms of torque in transient operation caused by the main turbocharger with reference to the typical turbo lag issues. An advanced solution of the engine boosting system was taken into account, considering the adoption of an e-booster system coupled to a waste-gated turbocharger, typically adopted alone in order to provide a reduced turbo-lag, i.e. an optimized transient response of the system. In the experimental activity described in this work, the maximum speed of the e-booster used is about 70000 rpm, the maximum pressure ratio is 1.5 and the maximum power required on the shaft is less than 4 kW. The compressor unit have to be maintained in the idle condition in order to avoid excessive electric consumption and overheating problem when

Marelli, Silvia, Usai, Vittorio

Ford ‘cranks’ it up with another big V8 for Mustang

19AUTP09_1109/01/2019

When Ford introduced the Mustang Shelby GT350 in 2015, it was the pinnacle of Mustang-ness thanks to its 5.2-L DOHC “Voodoo” V8 that featured a flat-plane crankshaft design to enable sky-high revs (the GT350's 8200-rpm redline is one reason Ferrari has long specified flat-plane V8s) and a rollicking 526 hp at 7,500. Then there's the exotic “rip” exhaust note unique to flat-plane V8s. But contemporary musclecar development times seemingly are as quick as their ever-dropping 0-to-60 mph runs-and before Ford released the Shelby GT350, its SAE-certified 526 hp already had been eclipsed by the 707-hp supercharged 6.2-L Hemi V8 in the Dodge Challenger SRT Hellcat and later the 797-hp Hellcat Redeye. Prior to all this, GM's Chevrolet started the hyper-power frenzy by generating 650 hp from the supercharged 6.2-L OHV V8 launched for the 2012 Camaro ZL1.

2019 Dodge Challenger: Deceased Demon seeds stronger and wider muscle-car lineup

18AUTP09_1009/01/2018

The 2019 Dodge Challenger lineup sees a savvy refresh that keenly redistributes its muscle-car strengths. With the one-model-year-only Demon passing into quarter-mile lore, its bawdy 808-hp supercharged V8 has been reapplied to create a more powerful Redeye version of the supercharged Challenger SRT Hellcat. Both the “regular” Hellcat and new Redeye version will be available in normal or Widebody configurations, though the shapely sheetmetal option is no longer a Hellcat exclusive. For 2019, the track-focused, naturally aspirated Challenger R/T Scat Pack trim will also be available with the wider track and fenders. The organ donation continues with a new Hemi-powered “1320” model receiving some of the Demon's drag racing tech to make it the new choice for quarter-mile aficionados.

Seredynski, Paul

Development of a Gasoline Direct Injector Fouling Test and Its Application to Study of Keep-Clean Performance at Different Additive Treat Rates

2016-01-224810/17/2016

As direct injection technology in gasoline engines has become increasingly sophisticated to seek better performance, even a small amount of deposit can have a negative effect on the functionality of injectors. Against such a background, gasoline with effective additives is expected to fix this issue, however, the clean-up and keep-clean processes are not fully understood. In this study, a direct injector fouling test has been developed in order to inspect in more detail injector fouling phenomena in gasoline engines. The test engine used was a 2012 downsized supercharged direct injection spark ignition (DISI) engine equipped with an injector of maximum 15MPa injection pressure. The test fuel consisted of one regular grade gasoline (RG) and three premium grade gasoline with different concentrations of detergent. In the study, it was validated that the developed engine test generates gasoline direct injector deposit (GDID), and SEM-EDX analysis confirmed the presence of GDID inside and

Miura, Yuichiro, Miyahara, Kensaku, Sasaki, Shinya, Kashio, Tsuyoshi, Yoshida, Katsumi

Volvo S90: Niche for now, but…

16AUTP10_1110/01/2016

It's no secret the reconstituted Volvo, since 2010 owned by China's Zhejiang Geely, is doing interesting and innovative things-one of the most intriguing, maybe, being that it's survived and in some senses thrived (particularly if fellow Swedish auto brand Saab is used as a measure) under Geely's control. Fact is that Volvo and Geely have shut up the naysayers: in the nearly seven years Geely's been in charge, a studied and benevolent guidance (not to mention $11 billion in product-development funding announced in 2012) has delivered a Volvo that's somehow managed to evolve its brand back to a relevancy few thought it could ever recover.

Coding, Evaluation, Comparison, Ranking and Optimum Selection of Supercharger

2016-01-029304/05/2016

The paper expresses an important issue of optimum selection of a supercharger for a given application from the global market in the presence of a variety of superchargers available commercially off the shelf (COTS). Coding scheme suggested is based on developing an attribute based scheme for all superchargers available off the shelf. N-digit coding scheme provides in-depth understanding of all the attributes to be considered by the customers, designers, engineers and engineers of the industry for further improvement. We also aim to create exhaustive database of superchargers along with their attributes. The paper adopts a MADM-TOPSIS (Multiple Attribute Decision Making -Technique for Order of Preference by Similarity to Ideal Solution) technique and graphical methods that are being used widely in different disciplines and are published. The method ensures that the optimum supercharger is closest to the hypothetically best solution and farthest from the worst solution. This technique

Singh, Jaspreet, Agrawal, Vishnu

Development of a Supercharged Engine for Motorcycle with a Centrifugal Supercharger

2015-32-072911/17/2015

1 In the development of motorcycle engines, a strong feeling of power, an element of being fun to ride has continued strong demand. However, demand to meet environmental performance, a conflicting element, has increased dramatically in recent years and a breakthrough technology that achieves both environmental performance and a feeling of power is in demand. Here, the newly developed engine has greatly enhanced feeling of power while clearing stringent environmental restrictions through use of a centrifugal type supercharger. However, there were several problems that had to be resolved with regards to application of a supercharger to a motorcycle engine. In applying a supercharger to a motorcycle, a major problem is the best way to keep the engine size from increasing in size. The engine, which is the heaviest parts on a motorcycle greatly affects motorcycle maneuverability so it must be compact and the mass concentrated. Another one of the problems was suppression of knocking to the

Watanabe, Hiroyuki, Ichi, Satoaki, Saito, Masahito, Arima, Kazuki, Ishibashi, Yasushi

Chassis Development for the Motorcycle With High Power Output Supercharged Engine

2015-32-072311/17/2015

In motorcycles, the size and output performance of the engine itself has a major effect on the maneuverability of the motorcycle. In particular for cases where a high output engine is mounted on a lightweight frame, these effects are even more of a concern. In the case of developing a racing motorcycle with a high power engine, the behavior of the motorcycle differs depending on the output range used and there are a lot of cases where changes to the basic dimensions of the motorcycle as well as the main components are required. Here, there are a lot of cases where the rider and drive-able courses are limited to compatibility with distinct specifications and when considering use as a general mass production motorcycle by riders with varying levels of skills and in various environments, it difficult to determine how to provide support. In the case of installing a high output engine on a general mass production motorcycle that is not for racing, ensuring of robustness of motorcycle

Ishii, Hiroshi, Saeki, Daisuke, Yamamoto, Tomo, Morikawa, Manabu, Sakurada, Eiji, Ichikawa, Kazuhiro, Sonoda, Seiichi, Nagata, Taku, Kimura, Toshiyuki

Analysis for Influence of Inhomogeneity of Air-Fuel Mixture to Super-Knock Caused by Pre-ignition in Supercharged Direct-Injected SI Engine Based on Numerical Calculation

2015-01-186609/01/2015

Nowadays, highly super charging is required corresponded to downsizing concept for improving thermal efficiency in direct-injected spark ignition (DISI) engine. However, highly super charging increases the possibility of super-knock caused by pre-ignition. Recently, in many studies, the reason of pre-ignition has been investigated but the reason why pre-ignition leads such strong knocking called super-knock has not been investigated. In DISI engine, it is estimated that there is more inhomogeneity of equivalence ratio and temperature of air-fuel mixture than it in port injection SI engine. In this study, factors which decide self-ignition timing was reviewed and the influence of inhomogeneity of air-fuel mixture to super-knock was investigated based on numerical calculation.

Negoro, Keito, Seki, Yuichi, Nishi, Mina, Iida, Norimasa, Matsuura, Katsuya, Sato, Yoshihisa

Banks Super-Turbo Freightliner a testbed for advanced technology

1175311/27/2013

The engineering behind this souped-up Class 8 truck that screamed up Pikes Peak earlier this year was detailed at the 2013 SEMA Show by Gale Banks and race/stunt driver Mike Ryan. Read full article at http://articles.sae.org/12620.

Ignition, Combustion and Exhaust Emission Characteristics of Micro-pilot Ignited Dual-fuel Engine Operated under PREMIER Combustion Mode

2011-01-176408/30/2011

The objective of this study is to investigate the performance and emissions in a pilot-ignited supercharged dual-fuel engine, fueled with different types of gaseous fuels under various equivalence ratios. It is found that if certain operating conditions are maintained, conventional dual-fuel engine combustion mode can be transformed to the combustion mode with the two-stage heat release. This mode of combustion was called the PREMIER (PREmixed Mixture Ignition in the End-gas Region) combustion. During PREMIER combustion, initially, the combustion progresses as the premixed flame propagation and then, due to the mixture autoignition in the end-gas region, ahead of the propagating flame front, the transition occurs with the rapid increase in the heat release rate.

Azimov, Ulugbek, Tomita, Eiji, Kawahara, Nobuyuki

JULY 2010 AUTOMOTIVE DESIGN

AUTODES071007/01/2010

Spotlight on Neville Jackson Ricardo's group technology director discusses powertrain development with Andrew English Charging into the future Electrically-driven superchargers could be a key technology in enabling downsized engines as Ian Adcock discovers The case for CAE Mark Fletcher reports on an advanced virtual dynamics suite

Second Generation Lysholm Compressor

98077402/23/1998

The Lysholm compressors is developed and is produced as a high-efficiency supercharger optimum for use in automotive engines. This paper describes a second-generation Lysholm compressor that has a self-contained lubrication system and a low inertia, and describes the systems connecting the engine and the Lysholm compressor.

Takabe, Shigeru, Ikeya, Nobuyuki, Miyagi, Yoshiyuki

A Variable Displacement Compressor/Expander for Vehicular Fuel Cell Air Management

96171308/01/1996

A “Proof of Concept” demonstration of a vehicular fuel cell air management system has been performed by VAIREX Corporation of Boulder, Colorado, USA. Pressure was generated between two proprietary Variable Positive Displacement Superchargers; one acting as a compressor, and one acting as an expander. A constant pressure of 207 kPa was maintained over a 5:l speed range. As much as 25% of the compressor driving power was recovered by the expander. The development of a dedicated fuel cell compressor/expander system based on this technology is now being sponsored by the Department of Energy.

Milburn, Ski Muir, Cronin, Jeremiah J., Cohen, Bradley M.

Potential of Additional Mechanical Supercharging for Commercial Vehicle Engines

94226811/01/1994

Modern commercial vehicle engines are equipped with turbocharging and intercooling. This results in low emissions and fuel consumption. In the lower speed and load range and under transient conditions, these engines have disadvantages, as the fuel injection rate has to be limited to avoid excessive smoke emission. Also, the engine braking performance of highly charged, small displacement engines is also lower than that of large displacement engines. Mercedes-Benz decided to develop a combination of turbocharger and mechanical supercharger. In the lower speed range higher torque levels are possible and maximum torque is available without any lag especially in the transient mode with low smoke emission and fuel consumption. Vehicle performance during acceleration can be improved by up to 30%. During engine braking operation, the mechanical supercharger is activated throughout the whole engine speed range which results in a distinctive increase in braking power. Possible vehicle

Schmitz, Thomas N., Holloh, Klaus-D., Juergens, Rolf, Fleckenstein, Guenter

An Analysis of Frictional Power=Loss for Developed New Vane-Type Super Charger Compressor

02/01/1988

Recently, use of superchargers has been popularized as a means of improving output of passenger car engines. Supercharging is not a new problem. Gottlieb Daimler published an idea to supercharge a gasoline engine by a mechanically driven superchager in 1885 in DRP 34926 (Ref. 1)*. Two types of supercharging are used currently; turbo supercharging and mechanical supercharging. Turbo superchargers (exhaust gas turbine superchargers) are used in most case, however, have a weak point that the supercharging effect at a low speed is very small. For low speed operation, mechanical superchargers which can improve, this weak point greatly, are rather preferable to be used. However, they have several disadvantages, such as, with an increase in speed, power loss increases, delivery air temperature rises, delivery air density lowers, and so on. For automotive engine superchargers, it is necessary to overcome these problems.

Sakamaki, Hiroshi, Horikoshi, Yukio, Tanzawa, Kenji, Hirabayashi, Hiroshi

AS1915 Knob (Supercharger Control)

AS1915-6 (Current)03/01/1987

No scope available.

Engine and Airframe Technical Standards Committee (TSC)

High Efficiency Supercharger Increases Engine Output, Reduces Fuel Consumption Through Computer Control

86139210/01/1986

Efficiency of a supercharger mainly depends on the clearances between the rotors and the housing, but it has hitherto proved impossible to reduce the clearances without a strong possibility of seizure. A two lobe Roots type supercharger has been developed which overcomes this problem by means of a special resin coating on the rotors. As a result, an increase of 18% in volumetric efficiency of the supercharger is achieved. Engine torque is increased by 30%. Drive power loss resulting from the operation of a supercharger at partial load when boost was not required caused fuel consumption to increase by about 10%. An electro magnetic clutch and an air by-pass valve controlled by the onboard computer were used in the new supercharger to eliminate this fuel economy loss. A passenger car equipped with the new supercharged 2-liter engine demonstrated about the same acceleration performance as a 3-liter class car without sacrificing fuel economy.

Kato, Shinichi, Nakamura, Norihiko, Kato, Kichiro, Ohnaka, Hidemi

Comparison of a Supercharger vs. a Turbocharger in a Small Displacement Gasoline Engine Application

02/01/1985

Supercharging and turbocharging can improve engine power and vehicle performance by boosting the intake manifold absolute pressure (MAP) above atmospheric pressure. This higher MAP results in increased charge densities which increase the maximum power available from the engine. A program to evaluate the overall system effects of supercharging and turbocharging has defined the differences and similarities between the two devices in a manner that supports the following conclusions.

Singer, David A.

Assessment of Positive Displacement Supercharging and Compounding of Adiabatic Diesel

84043002/01/1984

A new alternative to turbocompounding for converting exhaust heat from adiabatic diesels to mechanical energy is evaluated. The concept is based on a positive displacement screw compressor and expander pair applied to an adiabatic diesel for supercharging and mechanical power compounding to form a compact and efficient power system. Predictions of theoretical performance for the system and its components are given, and the technical feasibility and potential advantages of this system are discussed.

Wurm, Jaroslav, Kinast, John A., Bulicz, Tytus

Air to Air Turbocharged Air Cooling Versus Air-to-Water Turbocharged Air Cooling

84035102/01/1984

In Europe, turbocharged air in diesel engines used in on-road vehicles is cooled only by air. It is expected that by 1990, ten to twelve percent of European heavy trucks with diesel engines will cool turbocharged air by water. Air-to-air turbocharged air cooling is reviewed and the evolution of air-to-water turbocharged air cooling presented before the two systems are compared.

Moranne, Jean-Pierre, Lukas, Jerome J.

Simulation of a Positive Displacement Supercharger

84024402/01/1984

A computer simulation of a three lobe, roots blower for use as a positive displacement supercharger has been developed. The simulation considers three to five control volumes existing at various times in the supercharger cycle, and numerically integrates continuity and energy equations for the control volumes throughout the cycle. Instantaneous properties for the control volumes and instantaneous flows throughout the supercharger are predicted. Comparisons between predicted and experimental performance show that the simulation can adequately model performance trends of the supercharger. Use of the simulation in providing a supercharger map and supercharger performance on an engine is shown.

Sorenson, S. C.

Supercharging Compressors-Problems and Potential of the Various Alternatives

84024302/01/1984

Demand for pressure charged automobile engines has grown steadily since the energy crisis. Although turbocharging is ideal for improving the performance and fuel economy of I.C. engines, it has practical limitations for small engines. The paper examines the problems and the potential of mechanically driven systems as alternative form of pressure chargers for small engines.

Characteristics and Matching of the Pressure Wave Supercharger ComprexSr to a Passenger Car Engine

84501501/01/1984

The Comprex pressure-wave machine is well qualified for supercharging automotive Diesel engines, demonstrating as it does, improvements in power output, fuel consumption and emissions. The special form of the charging characteristics is established from theoretical considerations of the pressure wave compression process. Data from the currently available production machines show, with the aid of supercharging parameters, such a pressure ratio, density ratio and adiabatic compression efficiency, the operating limits of the machine with respect to cell filling and pressure-wave tuning. A computer program, interpolating from measured data and using a simplified model of the engine, allows optimisation of an installation considering Comprex type, shaft drive ratio, charge air cooling and control system functions. The correlation of the program with measured values is adequate for the purpose of engine-to-Comprex matching.

Mayer, A., El Nashar, I., Komauer, Chr.

Regenerative Supercharging of Four Stroke Internal Combustion Engines

83050702/01/1983

A regenerative supercharging method has been studied and shows an improvement in four stroke engine performance. With this method the mechanical or pneumatic connection between the engine and the supercharger is removed and replaced by a thermal connection. The heat from the engine is converted into compression work by means of a suitable R.S. cycle and this process leads to an increase in power and efficiency. Regenerative supercharging has been compared with traditional turbocharging and the results arc presented for some kinds of engines.

Cerri, Giovanni

Supercharging for Fuel Economy

81000602/01/1981

This paper explores the apparent dichotomy between the performance benefits of supercharging and fuel economy. Following an investigation of the tools available for fuel savings, especially drivetrain and engine alternatives, the desirable characteristics and optimum configuration of a supercharger are examined. Engine dynamometer data for a 1.7-liter gasoline engine equipped with a Bendix Supercharger and performance and test data from Bendix-supercharged test vehicles confirm that supercharging provides a means to achieve fuel economy, performance, driveability, and acceptable emissions.

Buike, J., Davis, J., Marsh, J., Ryder, L.

Measurement of Instantaneous Gas Temperatures for Determination of the Exhaust Gas Energy of a Supercharged Diesel Engine

67092910/30/1967

To calculate the true exhaust gas energy of a high-pressure turbocharged diesel engine, the pressures and the instantaneous temperatures were measured in the exhaust gas pipe of a test engine. The results and the problems encountered during measuring are described, and simple approximation equations for the instantaneous temperature are compared with the measured temperatures. Energy calculations carried out with these temperature functions have shown that the deviations from the true values are only slight.

Mollenhauer, Klaus

HIGH-SPEED, HIGH-OUTPUT, LOOP-SCAVENGED TWO-CYCLE DIESEL ENGINES

57006201/01/1957

THIS paper deals with the problems connected with high-speed loop-scavenged 2-stroke diesel engines. The theoretical processes of scavenging are described, and methods for their calculation are discussed. It is shown that it is possible to predetermine, to a considerable extent, the most important characteristic values of scavenging and, thus, to shorten the development work. Various arrangements for the supercharging of 2-stroke engines are treated, and the problem of turbocharging this type of engine is described.

List, Prof. Dr. Hans

AS6392 Knob (Supercharger Control)

AS6392-2 (Current)05/22/1956

No scope available.

Engine and Airframe Technical Standards Committee (TSC)

A HIGH SUPERCHARGE TWO-STROKE DIESEL INVESTIGATION

54017801/01/1954

RS326 Supercharger Mounting Flange 4.500" CTS

RS326-2 (Current)02/12/1951

No scope available.

Engine and Airframe Technical Standards Committee (TSC)

RS323 Supercharger Mounting Flange. 6.000" CTS

RS323-1 (Current)02/12/1951

No scope available.

Engine and Airframe Technical Standards Committee (TSC)

RS324 Supercharger Mounting Flange 2.4404" (62MM) CTS

RS324-2 (Current)02/12/1951

No scope available.

Engine and Airframe Technical Standards Committee (TSC)

RS325 Supercharger Mounting Flange 3.307" (84M.M.) CTS

RS325-2 (Current)02/12/1951

No scope available.

Engine and Airframe Technical Standards Committee (TSC)

MECHANICAL SUPERCHARGER DRIVES

48000301/01/1948

SHOTWELL, D. B.

Operational experiences on the Constellation supercharging, handling and loading characteristics

47013901/01/1947

Loomis, R. C., Cannady, E. E., Harper, W. L.

DIESEL ENGINE SUPERCHARGING

47006301/01/1947

Analysis of Positive Supercharger Losses - (ENGINEERING DIVISION REPORT) (RESEARCH REPORT KG 22-1 (4))

47017201/01/1947

PIGOTT, R. J. S.

Coordination of Supercharger Speed to Manifold Pressure

45021001/01/1945

THE control discussed here is used with engines having two engine-driven superchargers; one being driven at constant ratio; the other being driven through a fluid coupling at a variable degree of slip, and called the auxiliary stage. The auxiliary supercharger fluid coupling control consists of: 1. Engine power control. 2. Auxiliary supercharger control. The engine power control maintains the selected manifold pressure by automatically operating the carburetor throttle. The supercharger control is altitude responsive, operating the scoop of the hydraulic coupling. It is possible with this device to limit the manifold pressure below detonation independently from the pilot's selected pressure. By means of this device it is possible to control manifold pressure 2 in. of mercury below borderline detonation on engines without inter- or aftercooler.

FLOW CHARACTERISTICS OF INDUCTION SYSTEMS

45002101/01/1945

Fraas, Arthur P.

FUELS and ENGINES for Higher Power and Greater Efficiency

45019501/01/1945

THIS paper deals with importance of fuels in connection with the future development of engines for higher power and greater efficiency. Described here are investigations made on the effect of molecular structure on fuel knocking characteristics. These studies have lead to the discovery and manufacture of tank car quantities of an outstanding paraffin hydrocarbon known as triptane. This fuel is capable of increasing enormously the permissible output of engines with a high degree of supercharge and is also capable of permitting the attainment of higher efficiencies through the use of higher compression ratios. The commercial development of such fuels opens up new possibilities for the gasoline engine in the future.

KETTERING, C. F.

Supercharged two stroke cycle diesels

44010901/01/1944

Herold, Richard

CABIN SUPERCHARGERS

44008801/01/1944

The ELLIOTT-LYSHOLM SUPERCHARGER

43013601/01/1943

TODAY, the application of supercharging to all types of engines, and particularly to diesel engines, is becoming more and more widespread. Of the many schemes for supercharging, the mechanically driven positive-displacement compressor is very effective for the small high-speed engine and for the diesel engine that requires high torque at low speed. The authors illustrate the advantages of the Elliott-Lysholm supercharger by describing a 400- to 500-cfm unit.

LYSHOLM, ALF, SMITH, RONALD B., WILSON, W. A.

ALTITUDE PERFORMANCE of High-Output Aircraft Engines

41009901/01/1941

THIS paper deals principally with a description of the methods used in, and a discussion of the results of, an investigation of the possible altitude performance with liquid-cooled engines of high output and consequent high ground boost. As the first step in the investigation of altitude performance the power of the engine cylinder under all possible conditions of manifold pressure, manifold temperature, and exhaust pressure is determined. The single-cylinder laboratory employed can produce any desired exhaust suction; manifold pressures up to 150 in. hg; inlet air temperature up to 400 F; and handle engine speeds up to 5000 rpm. Maintenance of power at altitude by means of the exhaust-driven turbo compressor, Mr. DuBois believes, affords a most convenient way out for the engine manufacturer; the troubles, if any, are transferred to the builder of the turbo and of the airplane. He considers “worthy of considerable attention” the use of a two-stage supercharger with an auxiliary engine

SUPERCHARGED MOTORS FOR HIGHWAY TRANSPORT

41002101/01/1941

Problems Relating to the CONTROL of FLOW in SUPERCHARGERS

41009601/01/1941

COMPARISONS are drawn, in this paper, between engine supercharger and cabin supercharger flow-control problems. Some new methods of obtaining efficient flow control are discussed. Interdependent factors existing between flow control and impeller speed control must be recognized. It is pointed out that design features in the supercharger should be correlated closely with the type of control applied. Effects arising from the connection of superchargers to receivers of large volume are presented. Necessity for regulation of flow, pressure, and rate of pressure change in pressure cabins requires the solution of numerous new problems. The advantage of simultaneous design of the supercharger and controls, and the desirability of integral supercharger and control units, are stressed. It has been necessary to overcome many mechanical problems in order to produce units of a type suited for pressure cabin operation. Typical control constructions are described. Aircraft manufacturing concerns are

PRICE, NATHAN C.

MECHANICAL SUPERCHARGING of DIESEL ENGINES

41013601/01/1941

THE most serious problem arising from higher degrees of supercharging is the increase in exhaust temperatures and the amount of additional heat to be handled. This conclusion is expressed following a theoretical exploration into the possibilities of supercharging and the ultimate limit to which it is possible to go. Efficiencies which may be expected with increasing degrees of supercharging, with and without compressor intercooling, are predicted. Some of the present-day superchargers are discussed, including the Roots, vane, centrifugal, and exhaust turbo-type blowers, and the advantages and disadvantages of each are given. Before closing his paper, Mr. Knudsen emphasizes the need for more compact and efficient accessories. No attempt has been made, he says, to improve the specific capacity of these units, with the result that, “as we go down in engine size and up in horsepower, the auxiliaries become larger, heavier and bulkier than ever - so much so that, at the present time, we are

A BRIEF ANALYSIS OF THE AUTOMOTIVE LUBRICATION SYSTEM

36003201/01/1936

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