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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。
In order to explore the feasibility of the ultrasonic nozzle applied to the pulse detonation engine, a pre-membrane pole sentry ultrasonic nozzle was designed and its atomization characteristics were experimentally studied by laser particle sizer and high-speed camera. The flow characteristics , Saussurea mean droplet diameter SMD and atomization angle. The experimental results show that the average atomized particle size SMD is about 20μm and the droplet size distribution index N is greater than 2 under the requirement of satisfying the nozzle flow rate. SMD increases slightly with the increase of hydraulic pressure difference, The distance between the measuring point and the exit of the nozzle increases and the SMD increases. The cavitation effect is best when the cavity distance is 15mm from the exit of the nozzle, and the spray angle increases with the increase of the hydraulic pressure difference.