Effect of different Fuels Characteristics for Cavitation of Vaporous Clusters of Bubbles Close to a Wall assessed with Real Fluid Thermodynamics
2022-01-0468
03/29/2022
- Event
- Content
- High-pressure fuel injection may lead to an optimized combustion process, high efficiency, and low emission formation for Dual-Fuel engines. In such systems, fuel heating/cooling and phase-change are inherent phenomena. Furthermore, cavitation inside injectors could lead to erosion damage and, thus, jeopardize the performance of the injector. Usually, simple thermodynamic equations of states (EoS) are the most employed to model such phenomena and predict where and how they appear, especially for their simplicity and computational cost trade-off. The most popular is the barotropic EoS, where thermal effects are not considered. In the current work, we aim to examine the pressure peaks and thermal effects for the collapse of a vaporous cluster of bubbles using a real thermodynamic EoS. Thus, the closure of the numerical framework is achieved by using a structured table and a simple algorithm that performs a linear reconstruction of the thermodynamic properties of the working fluid. Its searching speed is independent of the resolution of the table. We incorporated the tabulated EoS in an explicit density-based solver in OpenFOAM. Given the wide range of velocity and speed of sound values that can be found in simulations of this nature, a Mach-consistent numerical flux for subsonic up to supersonic flow conditions has been employed. For the first time, real-fluid thermodynamics have been considered in the study of the collapse of a vaporous cluster of bubbles. Because of our interest in cavitation-induced erosion, we focus on the collapse close to a wall in order to capture both pressure peaks and thermal effects. The solver has been validated for different clusters of bubbles against published data. Finally, we performed a parametric analysis with different fuels (i.e. Diesel, Ethanol, Methanol) where it is evident pressure peaks are strongly dependent on fuels characteristics such that density and saturation pressure.
- Citation
- BELLINI, R., "Effect of different Fuels Characteristics for Cavitation of Vaporous Clusters of Bubbles Close to a Wall assessed with Real Fluid Thermodynamics ," SAE Technical Paper 2022-01-0468, 2022, .