脉冲爆震发动机无阀工作对供给系统影响研究

通过测量无阀脉冲爆震发动机非定常工作对供气供油系统影响的压力数据,对建立的燃油和空气管路数值仿真模型进行了验证,基于建立的模型研究了供给系统的流量特性.研究结果表明,供油供气系统受同一爆震管头部压力作用带来的影响是不同的,这进一步导致供给系统气动开启初始充填的非定常特性,对于给定的供给系统,这种非定常特性的持续时间是固定的,当发动机工作频率增大时,其占单个周期的比重越来越大,最终导致脉冲爆震发动机的不稳定工作. 

Research on the effects of valveless operations of pulse detonation engine on supply system

Experimental research on the effects of valveless pulse detonation engine on supply system was conducted. The pressures at different positions of pipe were measured, which were also used to verify the numerical simulation models of fuel pipe and air pipe. Based on the numerical model, flow characteristics of the supply system was investigated. It was shown that the influences of same head pressure on the air and fuel supplies were different. And it caused the unsteady filling when supply system opened because of differential pressure. The unsteady filling time was fixed and was determined by the given supply system. When the work frequency of the engine increased, the ratio of this time to one cycle time increased, that is to say the more influences of unsteady feeding were imposed on the operation characteristics of the engine. Therefore, the distribution of fuel concentration was more non-uniform and the work state of pulse detonation engine came into instability.