二甲醚闪急沸腾喷雾的实验研究

采用高速摄像技术在常温常压状态下对二甲醚闪急沸腾喷雾过程进行了观察,研究了启喷压力和喷孔直径对喷雾形态发展过程、喷雾贯穿距和喷雾锥角的影响。实验结果表明,喷嘴启喷压力越大,涡环形成时间越晚,喷雾锥角越小,喷雾贯穿距越大;喷孔直径越小,涡环形成时间越晚,喷雾锥角越小。喷孔直径对喷雾贯穿距的影响则比较复杂,在喷雾前期,喷孔直径越小,喷雾贯穿距越大,但在喷雾后期,情况正好相反。

Experimental Research on Flash Boiling Spray of Dimethyl Ether

In this study,the high-speed digital imaging technique is applied to observe the developing process of flash boiling spray of dimethyl ether at low ambient pressure, and the effects of nozzle opening pressure and nozzle hole diameter on the spray shape,spray tip penetration and spray angle during the injection are investigated. The experimental results show that with the enhancement of nozzle opening pressure, the time when the vortex ring structure of flash boiling spray forms becomes later,the spray tip penetration increases and the spray angle decreases;the influence of nozzle hole diameter on the spray tip penetration is relatively complicated,the spray tip penetration is longer at smaller nozzle hole diameter at the early stage of injection,while the situation is just opposite at the late stage of injection.