【摘 要】
：
Three dimensional Computational Fluid Dynamics(CFD)simulations of Gasoline Direct Injection(GDI)combustion in a spray-guided Spark Ignition(SI)engine have b
【机 构】
：
ANSYSInc.EngineResearchCenter,UniversityofWisconsin
【出 处】
：
13th International Conference on Liquid Atomization and Spra
论文部分内容阅读
Three dimensional Computational Fluid Dynamics(CFD)simulations of Gasoline Direct Injection(GDI)combustion in a spray-guided Spark Ignition(SI)engine have been performed using ANSYS Forte CFD software.A multi-component surrogate fuel blend was used to represent the chemical and physical properties of the gasoline used in the experimental spray chamber and engine tests.A 230-species validated reaction mechanism was used to accurately model the fuel combustion and emission formation.Full cycle simulations were performed including intake and exhaust ports and valve and piston motion.Automatic mesh generation was used to dynamically generate a mesh with selective refinement at boundaries and in certain critical flow regions.To ensure accurate simulation of spray evolution,which is critical to GDI engine simulations,spray models were also validated in this study against experimental spray injection measurements in a chamber.These data included spray penetration,transient spray velocities and Sauter Mean Diameter(SMD)at different axial and radial points from the spray tip,obtained using a Phase Doppler Particle Analyzer(PDPA)system.The simulations agreed well with these spray chamber measurements.For the GDI engine,the predicted results agreed well with the experimental data for cylinder pressure and combustion phasing,while varying spark timing and equivalence ratio.
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