厚液膜敞口型离心喷嘴自激振荡特性试验  

Test on self-excited oscillation characteristics of an open-end swirl injector with thick liquid film

作　　者：薛帅杰 刘红军[1,2] 洪流 陈鹏飞[1,2] XUE Shuaijie;LIU Hongjun;HONG Liu;CHEN Pengfei(Xi＇an Aerospace Propulsion Institute,Xi＇an 710100,China;Key Laboratory of Science and Technology on Liquid Rocket Engine,Xi＇an 710100,China)

机构地区：[1]西安航天动力研究所,西安710100 [2]液体火箭发动机技术重点实验室,西安710100

出　　处：《航空学报》2018年第9期72-81,共10页Acta Aeronautica et Astronautica Sinica

基　　金：国家"973"计划(613239010102)~~

摘　　要：为了解补燃循环液氧煤油发动机预燃室煤油离心喷嘴的自激振荡特性,在大气环境下开展了厚液膜敞口型离心喷嘴自激振荡特性试验研究。无外加激励条件下,使用水作为工作介质,通过增加喷嘴长度的方法实现了敞口型离心喷嘴旋流腔液膜增厚和内流过程持续自激振荡。采用脉动压力传感器和高速相机记录了喷前压力、旋流腔气涡和喷注雾化的振荡特性。研究发现:喷嘴自激振荡过程中,旋流腔气涡周期性地"间断"和"贯通",气涡"间断"时喷注过程具有显著的Klystron效应;喷前压力、旋流腔气涡和喷注雾化过程的振荡频率接近且不同喷注压降条件下振荡频率基本保持在10~45Hz之间,喷注压降对振荡过程的影响较小,喷前压力相对振荡峰值与其振荡频率显著相关;喷嘴的自激振荡过程可能由旋流腔内的液膜流动过程和气涡流动过程的耦合作用主导。To understand the self-excited oscillation characteristics of the kerosene swirl injector in the pre-burner of staged combustion LOx/kerosene rocket engine,self-excited oscillation in the open-end swirl injector has been investigated experimentally in the atmospheric environment using water as the working fluid.Sustained self-excited oscillation of the internal flow process was spontaneously generated in an open-end swirl injector with long swirl chamber and thick liquid film.The fluctuations of the pressure before injecting,the gas core in the swirl chamber and the spray process were detected by a dynamic pressure sensor and a high-speed camera.It is found that the gas core in the swirl chamber became disconnected periodically when self-excited oscillation was generated,and the Klystron effect of spray was induced when the gas core was disconnected.The fluctuation frequencies of the pressure,the gas core and the spray were close to each other under the same working condition,and were limited in the range from 10 to 45 Hz with different injection pressure drops.The pressure drop of the injector had unremarkable impact on the fluctuation process.There is a significant correlation between the relative amplitude of dynamic pressure and the fluctuation frequency.The self-excited oscillation of the injector may be induced by interaction of the gas core with the film in the swirl chamber.

关 键 词：敞口型离心喷嘴 厚液膜 气涡 雾化 自激振荡 Klystron效应 

分 类 号：V434.3[航空宇航科学与技术—航空宇航推进理论与工程]