摘要
内燃机运转过程中,燃烧室的容积不断地发生变化,燃烧室内的燃烧源分布也随之变化,因而燃烧过程中缸内压力的高频振荡是很复杂的过程.KIVA软件结合SYSNOISE声学软件,建立燃烧室内热声耦合引起的压力场变化模型,定量分析了缸内压力的高频振荡过程.模拟计算多点燃烧激励状态下的燃烧室内压力波的传播过程,模拟结果与试验结果较吻合.模拟计算较好地体现燃烧室内某个位置的压力振荡过程,以及分析造成压力振荡的主要声源特性.结果表明:燃烧放热与燃烧室声场存在相互影响,压力波传播必须考虑声学的迟滞效应.
Volume of combustion chamber changes during the operation of an internal combustion engine.Meanwhile,the distribution of combustion sources also changes. High-frequency pressure oscillations are a very complex process. The model of pressure change caused by thermo-acoustic coupling was built by combining KIVA and SYSNOISE. Process of high-frequency pressure oscillations was analyzed quantitatively. Propagation of pressure waves was simulated under various combustion excitation conditions. The simulation results are consistent with the test measurement. The simulation results better demonstrate the process of pressure oscillations in some exact positions of combustion chamber. The characteristics of main acoustic sources were analyzed. Results show that there exists an interaction between heat release and acoustic field in the combustion chamber. Hysteresis effect should be considered during the propagation of pressure waves.
出处
《内燃机学报》
EI
CAS
CSCD
北大核心
2014年第5期454-459,共6页
Transactions of Csice
关键词
内燃机
燃烧
热声耦合
压力振荡
internal combustion engine
combustion
thermo-acoustic coupling
pressure oscillations
