预膜式杆射哨超声波喷嘴雾化特性研究

发布时间：2018-01-18 15:32

本文关键词：预膜式杆射哨超声波喷嘴雾化特性研究　出处：《推进技术》2016年06期 　论文类型：期刊论文

【摘要】：为了探索超声波喷嘴应用于脉冲爆震发动机的可行性,设计了一种预膜式杆射哨超声波喷嘴,并采用激光粒度仪和高速相机对其雾化特性进行了实验研究,得到了其流量特性、液滴索太尔平均直径SMD和雾化角度。实验结果表明:在满足喷嘴流量的要求下,平均雾化粒径SMD约为20μm,液滴尺寸分布指数N大于2;SMD随油压差的变大而略有增大,随气液比ALR的增加而减小;随着测点距喷嘴出口的距离变大,SMD增大;共振腔距离喷嘴出口15mm时雾化效果最好;喷雾角度随着油压差的增加而增大。
[Abstract]:In order to explore the feasibility of application of ultrasonic nozzle to pulse detonation engine, a prefilm rod shot ultrasonic nozzle was designed, and the atomization characteristics of the nozzle were studied by laser particle size meter and high speed camera. The flow characteristics, droplet average diameter SMD and atomization angle were obtained. The experimental results show that the average atomization diameter SMD is about 20 渭 m when the nozzle flow rate is satisfied. Droplet size distribution index N > 2; The SMD increases slightly with the increase of the oil pressure difference and decreases with the increase of the gas-liquid ratio ALR. The SMD increases with the increase of the distance between the measured points and the nozzle outlet. The atomization effect is the best when the cavity is 15mm away from the nozzle outlet. The spray angle increases with the increase of oil pressure difference.
【作者单位】：南京航空航天大学能源与动力学院;
【分类号】：V231.2
【正文快照】： 1引言发展先进的航空发动机燃烧室技术需要依靠良好的雾化以及快速均一的掺混,燃油喷嘴作为其中一个关键部件,其雾化性能直接关系到燃烧室能否可靠点火和稳定工作,满足推力油耗率、污染物排放和工作寿命的要求[1~3]。超声波燃油雾化是利用空气射流在共振腔产生高频率、高振幅

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