【摘要】 以经过改装的火花点火式发动机作为研究对象,首先进行不考虑燃烧室声场影响的内燃机燃烧三维模型燃烧模拟,并将模拟结果同燃烧过程高速摄影结果比较分析;然后进行燃烧室声激励下的压力场研究和考虑燃烧室声场影响的准维模型的燃烧模拟计算。不考虑燃烧室声学影响的燃烧模拟结果与实际的燃烧试验结果存在较大的差异;闭式燃烧室内考虑声学影响时,由于燃烧激励使得燃烧室的压力场存在着波动。结果表明,燃烧室的声学特性对燃烧过程中压力的变化存在显著的影响。更多还原

【Abstract】 A modified SI engine is chosen as the research object.Simulation in three-dimensional combustion process without the influence of the combustion chamber acoustics was made and compared with the high-speed photo of engine combustion process.The changes of the combustion chamber’s pressure fields with multi-point excitation were studied,and the quasi-dimensional combustion process taking into account of combustion chamber acoustic were conducted.Remarkable difference between combustion simulation with and without combustion chamber’s acoustic was presented.Pressure oscillation was presented when considering the acoustic influence.Acoustic characteristic of combustion chamber greatly affects the pressure variation of combustion process.更多还原