【摘 要】
：
In a direct injection spark ignition(DISI)engine,the spray impingement on cylinder wall and piston creates a significant challenge to the homogeneity of fuel-air mixture formation in the engine cylind
【机 构】
：
University of Michigan-Shanghai Jiao Tong University Joint Institute,Shanghai Jiao Tong University,S
【出 处】
：
13th International Conference on Liquid Atomization and Spra
论文部分内容阅读
In a direct injection spark ignition(DISI)engine,the spray impingement on cylinder wall and piston creates a significant challenge to the homogeneity of fuel-air mixture formation in the engine cylinder.Moreover,the spray structure varies significantly due to the cycle-to-cycle variation of the intake air charge motion caused by the piston movement and valve motion.Hence,it is a complex process to evaluate the spray-wall interaction in the combustion cylinder of an engine.In this research,a variable intake manifold with an adjustable valve is designed to control the swirl ratio so that the interaction of the intake air flow and spray can be studied accordingly.The overall transient spray impingement structure and fuel film formation are analyzed with different swirl ratio during the intake stroke.A 3-D numerical model using the CONVERGE CFD code is developed and integrated with a 1-D GT-Power model in this research to provide the numerical results.Extensive validation and verification of the model results are conducted to ensure the accuracy of the models.The results are presented by comparing the Mie-scattered spray images from the engine testing and the numerical data from the engine model.Under different swirl ratio conditions,the transient spray structure,the piston impingement distribution,and the liner impingement distribution can be investigated.
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