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在前期发动机台架实验和高速摄影实验的研究基础上 ,为进一步了解燃油束撞击法形成混合气及其在小型柴油机上实现直喷式燃烧的机理 ,用多次喷雾叠加摄影技术以及马尔文激光粒子分析仪对带挡块的轴针式喷油器的喷雾过程进行了研究。实验中对不同形状挡块以及不带挡块的油束形成过程进行了详细的观察 ,并对撞击前后的油滴滴径进行了测量。结果表明 ,燃油经撞击后可显著地增大油束扩散角 ,不同程度地影响了燃油束的贯穿度 ,但燃油束撞击前后的滴径变化不大。加深了对油束撞击现象、撞击油束雾化特点和混合气形成过程以及在小型柴油机内实现直喷式燃烧的认识
Based on the research of the previous engine bench experiment and high-speed photography experiment, in order to further understand the mechanism of fuel jet impingement forming mixture and its direct injection combustion on a small diesel engine, with multiple spray overlay photography and Malvern laser The particle analyzer studied the spraying process of the pin-type injector with stopper. In the experiment, the forming process of the block with different shapes and no block was observed in detail, and the droplet diameter before and after impact was measured. The results show that the fuel jet can significantly increase the oil diffusion angle after impact, which affects the penetration degree of the fuel bundle to some extent. However, the droplet diameter before and after the fuel bundle impact does not change much. Deepen the understanding of the phenomenon of oil jet collision, the characteristics of collisional oil jet atomization and the formation of mixture, and the direct injection combustion in a small diesel engine