离心压气机与脉冲爆震燃烧室共同工作分析

为了掌握压气机与爆震室相互作用机理,实现压气机与爆震室稳定匹配工作,针对离心压气机与爆震室共同工作过程建立了数值计算模型,并采用脉冲爆震涡轮发动机原理性试验系统进行验证,在此基础上结合传统航空发动机中压气机特性分析方法,对反传作用下的压气机工作特性进行了计算分析。结果表明:反传压力波使压气机内出现了瞬间的气体倒流现象,并且会在进气转接段内形成压力波动,使压气机出口长时间处于非稳态工况;压气机与爆震室匹配工作时,压气机工作特性线朝喘振边界靠近,效率低于0.39,而同转速下,压气机单独工作时,其效率均在0.81以上。

Analysis on interaction between centrifugal compressor and ,pulse detonation combustor

In order to realize the stable operation of centrifugal compressor and pulse detonation combustor (PDC) combined system, it is necessary to investigate the interaction between them. A pulse detonation turbine engine principle test system was established, in which reversal-pressure wave was continuously generated from the high-pressure combustor to the centrifugal compressor. A simulation model was constructed to analyze the reversal-pressure wave. The simulation model was verified by the pulse detonation turbine engine principle test system. Based on that, the operating characteristics of the centrifugal compressor were calculated and analyzed. Results showed the reversal-pressure wave caused an instantaneous gas back flow in the compressor, leading to pressure oscillations at the compressor exit, and the compressor outlet was under unstable condition for a long time consequently. When the compressor worked together with the PDC, the compressor operating line got closer to the surge boundary, with the compressor efficiency dropping below 0.39, while the efficiency was over 0.81 under the condition of the compressor working alone.