摘要
利用热线风速法，研究了汽油机缸内紊流运动的部分控制因素，分析了转速、压缩比、挤气间隙、节气门开度等对缸内紊流运动的影响规律。研究结果表明，在压缩上止点附近，缸内紊流运动随转速的升高、挤气间隙的减小以及节气门开度的增大而加强，但随压缩比的升高而减弱；紊流时间尺度随转速的升高而减小，但基本不随其它参数变化；紊流空间尺度随转速的升高、挤气间隙的减小以及节气门开度的增大而增大，但随压缩比的增大而减小；转速升高时，紊流高频能量成份所占比例增大，但其它参数对紊流能量的频率分布状态影响不大。
In this paper,the control factors of turbulence in cylinder of gasoline engines are studied by hot wire method.The effects of speed,compression ratio,squeeze gap and throttling on turbulence characteristics are analysed.The study results show that,near the top of compression stroke,the turbulent motion is enhanced with the increasing in speed and throttling,enhanced with the decreasing in squeeze gap and compression ratio.The turbulence time scales decrease with the increasing in speed,but be nearly independent of other variables.The spatial scales increase with the increasing in speed,or decreasing in squeeze gap and throttling,but decrease with the increasing in compression ratio.With the increasing in speed,the fraction of high frequency turbulence energy increases,but other variables have little effect on the state of turbulence energy distribution in frequency.
出处
《内燃机学报》
EI
CAS
CSCD
北大核心
1999年第3期267-270,共4页
Transactions of Csice
