液体火箭发动机离心式喷嘴振荡喷雾特性现状和发展趋势

Current status and trend of dynamic atomization characteristics of swirl injector under oscillating environment in liquid rocket engines

为加深对振荡喷雾的雾化特性及其与不稳定燃烧的关系的认识,针对低温推进剂液体火箭发动机中广泛应用的气液同轴离心式喷嘴和液液同轴离心式喷嘴,从受激振荡、自激振荡以及喷雾振荡与燃烧稳定性三个方面对研究现状进展进行了综述,总结了以往研究中的成果以及需要克服的关键技术难题,以加深对振荡喷雾及其与燃烧稳定性关系的认识。通过综述可知:对于受激振荡,对于常温常压条件下的供应系统流量振荡引起的前端压力振荡的研究比较充分,但缺少对燃烧室压力变化引起的反压振荡的研究以及超临界条件下喷雾受激振荡的研究;对于自激振荡,研究主要集中在液体中心型同轴离心喷嘴,对于气体中心型同轴离心喷嘴和液液同轴离心喷嘴的研究还较少;光学诊断技术仍难以提取单一的燃烧流场信息。

In order to master the atomization characteristics of oscillating spray and its relationship with unstable combustion,research and development of gas-liquid coaxial swirl injectors and liquid-liquid coaxial swirl injectors,which are widely used in liquid rocket engines,are reviewed from three aspects of excited oscillation,self-pulsation,and interactions of spray oscillation with combustion stability,so as to deepen our understanding of them.According to the review,for the excited oscillation,the research on the upstream pressure oscillation caused by flow oscillation of supply system under normal temperature and pressure conditions is relatively sufficient.However,the research on the backpressure oscillation caused by pressure oscillation in the combustion chamber and the research on the excited oscillation of spray under supercritical conditions are lack.For the self-pulsation,the current research is focused on the liquid-centered coaxial swirl injectors.There are few studies on the gas-centered coaxial swirl injectors and liquid-liquid coaxial swirl injectors.The optical diagnosis technology is far from enough to extract the single combustion flow field information.