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The components of combustion chamber (cylinder head-cylinder liner-piston assembly-oil film) were taken as a coupled body.Based on the three-dimensional heat transfer numerical simulation of the coupled body,a coupled three-dimensional calculation model for in-cylinder working process and the combustion chamber components was built with domain decomposition and boundary coupled method,which implements the coupled three-dimensional simulation of in-cylinder working process and the combustion chamber components.The model was applied in the influence investigation of the space non-uniformity in heat transfer among combustion chamber components on the generation of in-cylinder emissions:NOx.The results showed that the heat transfer space non-uniformity of combustion chamber components directly influences the formation of in-cylinder NOx.The main area being influenced was the accessory area on the wall,while the influence on the generation of NOx in the central area couold be omitted. 相似文献
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四气门柴油机缸内流场LDA实验数据的分析研究 总被引:1,自引:0,他引:1
在一台经过改装的105单缸四气门柴油机上,由电机倒拖,使用激光多普勒测速仪(LDA)测量了缸内上部在进气和压缩过程的速度信号,分别使用小波分析法和集总平均法对进气和压缩过程中缸内的流场的平均速度和湍流强度进行了计算比较。小波分析结果中,对不同小波函数及小波分解层数分析结果进行了讨论。结果表明,在进气过程中,各尺度下的湍流强度值均较大,在压缩过程中,湍流强度值减小,使用集总平均法得到的湍流强度值大于小波分析法得到的结果。而且各不同尺度湍流强度变化曲线一致,说明各频段之间能量变化一致。 相似文献
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