大推力液氧煤油补燃发动机高频燃烧不稳定性的控制方法

摘要

针对大推力液氧煤油补燃发动机高频燃烧不稳定性问题,讨论了气液同轴式喷嘴、隔板和整流栅等主要控制方法及其控制机理.对喷注单元和隔板进行了声学实验,获得了气喷嘴长度、节流直径以及隔板高度、间隙等结构参数对燃烧室声学特性的影响规律.研究表明,合理设计气液喷嘴和隔板可有效控制高频燃烧不稳定性；对未来重型运载大推力补燃火箭发动机的高频燃烧不稳定性控制方法以隔板和气液喷嘴为主,应采取流强分区、整流栅等技术措施.%The primary available control techniques and principles of high frequency combustion instability for high thrust LOX/kerosene staged combustion cycle engine, such as gas-liquid coaxial injector, baffle and the perforated gas distribution plate were discussed. Acoustic modeling tests of single injector and baffle were respectively conducted, and the effects of the structural parameters(the length of injector, throttle diameter and the height of baffle, etc) on combustion acoustics characteristics were obtained. The results show that the reasonable configurations of injector and baffle were effective to control high frequency combustion instability and the control scheme of the high thrust chamber of LOX/kerosene engine for the future heavy lift launch vehicle was finally given.