| 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。 |
| 关键词: 超声波喷嘴 雾化特性 流量特性 喷雾角度 平均粒径 |
| DOI： |
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| Investigation of Atomization Characteristics of a Pre-Filmed Ultrasonic Nozzle with Central Rod |
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WU Yu-wen,HAN Qi-xiang,YANG Guang-yuan,WANG Jia-hua
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(School of Energy and Power Engineering，Nanjing University of Aeronautics and Astronautics，Nanjing 210016，China)
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| Abstract: |
| In order to investigate the feasibility of the ultrasonic nozzle used in the pulse detonation engine，a pre-filmed ultrasonic nozzle with central rod was designed，and its atomization characteristics were experimentally investigated with a laser diffraction analyzer and a high-speed camera. Mass flow characteristics，Sauter mean diameter (SMD) and spray angle were obtained. The results indicate that when the nozzle mass flow rate is satisfied，the SMD is about 20μm and the particle size distribution index N is larger than 2. SMD rises with the increase of the fuel pressure differential，and it drops with the increase of air-to-liquid ratio. SMD increases when the distance between the measuring location and the nozzle outlet increases. The atomization quality is the best when distance between the nozzle and the resonator is 15mm. The spray angle rises when the fuel pressure differential increases. |
| Key words: Ultrasonic nozzle Atomization characteristics Mass flow characteristics Atomization angle Particle mean diameter |
