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本文报导了在一台被拖动的单缸柴油机上利用平面侧壁的透明燃烧室模型和粒子示踪法对压燃式发动机中挤流和环涡运动谱进行研究的结果,解释了利用上述燃烧室模型模拟实际燃烧室的理论根据,并根据所得的流谱讨论了环涡的产生原因和有关影响因素。结果表明:实际的流谱与过去文献中出自想象的流谱有很大差别,挤流并不能穿透到燃烧室中心,只有在缩口燃烧室中可看到明显的环涡。影响环涡大小和位置的主要因素是燃烧室的扩张角。环涡的形成并不是由于挤流对撞,而是由于附面层分离造成的,且与挤流的大小并无直接的关系。
This paper reports the results of the study on the squeezed flow and ring eddy motion spectrum in a compression-ignition engine by using a flat combustion chamber model and a particle tracer on a single-cylinder driven diesel engine. The results of the above The combustion chamber model simulates the theoretical basis of the actual combustion chamber and discusses the causes of the formation of the ring vortices and the related influencing factors according to the obtained fluid spectrum. The results show that the actual flow spectrum is quite different from the imagined fluid flow spectrum in the past literature. The squish flow can not penetrate to the center of the combustion chamber. Only visible whirlpool can be seen in the necked-in combustion chamber. The main factor affecting the size and location of the annulus is the expansion angle of the combustion chamber. The formation of the ring vortex is not caused by the collision of the squeeze flow, but due to the detachment of the detachment layer, and has no direct relation with the size of the squeeze flow.