燃烧室轴向长度对旋转爆震发动机性能的影响  

Influence of chamber length on rotating detonation engine performance

作　　者：孙健[1] 周进[1] 林志勇[1] 刘世杰[1] 

机构地区：[1]国防科学技术大学航天科学与工程学院,长沙410073

出　　处：《航空动力学报》2016年第9期2080-2086,共7页Journal of Aerospace Power

基　　金：国家自然科学基金(51306202)

摘　　要：采用氢氧单步化学反应模型,对以当量比为1.0的氢气空气预混气为反应物的旋转爆震发动机（RDE）进行了数值模拟,系统研究了燃烧室轴向长度对RDE性能的影响.通过详细分析燃烧室进出口气体状态参数,揭示了燃烧室轴向长度对发动机影响的内在机理.研究结果表明：燃烧室轴向长度过短时,爆震波的形成不够充分;在发动机推力中,动量推力占主要部分;在计算的燃烧室轴向长度范围内,发动机的比冲为5 410-5 566s,燃烧室轴向长度对发动机比冲的影响较小.Numerical simulations using single step chemical model were carried out to investigate the influence of chamber length on rotating detonation engine （RDE） with an equivalence ratio of 1.0. By analyzing the gas condition parameters of chamber inlet and outlet, the internal mechanism of the influence of chamber length on RDE performance was revealed clearly. The results show that when the chamber length is too short, the detonation wave is not fully formed; the momentum thrust is the main part of thrust; within the range of chamber lengths simulated, the specific impulses are 5 410-5 566 s, thus the chamber length has little effect on RDE performance.

关 键 词：旋转爆震发动机 燃烧室轴向长度 推力密度 比冲 爆震波 

分 类 号：V435[航空宇航科学与技术—航空宇航推进理论与工程]