引射空气对压力旋流喷嘴喷雾特性的影响

用定容器模拟斯特林发动机的燃烧室，以低硫柴油为介质，利用高速摄影仪和激光粒度仪，研究了空气引射对压力旋流喷嘴的喷雾发展规律和粒径分布的影响规律.结果表明，喷油量和气流引射对喷雾发展特征和雾滴直径分布影响很大，引射气流能消除静态喷雾初期的液体滴漏现象，使得形成稳定喷雾的时间变短, 喷雾扩散度增大，雾滴扩散程度明显增大，宏观喷雾形态改善；气体引射使得喷雾粒径减小，粒径分布范围更加集中，雾化效果明显改善.

Experimental Study of Influence of Air Ejecting on Spray Characteristics of Pressure Swirl Nozzle in a Stirling Engine

The objective of this paper is to investigate the influence of air ejecting on the fuel spray and atomization characteristics of a pressure swirl nozzle in a Stirling engine by using high a speed camera and a FAM laser particle size analyzer. The experimental results indicated that the air ejection produced good effects on the spray morphology. With the help of ejection, the spray drip phenomenon disappeared and the spray diffusion increased greatly. The results also indicated that the air ejection enhanced fuel atomization quality, the droplet sizes tended to be smaller and the size distribution was more uniform.