进气系统对无阀脉冲爆震发动机性能影响试验研究

Experimental study for the effect of induction systems on valveless pulse detonation engine

模拟亚声速自由来流,以汽油和空气为推进剂,对吸气式PDE模型机进行了地面多循环爆震试验,研究了6种进气系统下PDE模型机的多循环爆震性能和推进性能。试验结果显示,不论采用何种进气系统,均能以低于50mJ的点火能量实现模型机的多循环单级起爆,且PDE平均推力均随着工作频率的增加而增加;来流喷口和进气道进口面积较小时增加速率较快。随着环缝堵塞比的增加,PDE的平均推力有所降低。

This paper addressed the operation and propulsive performance of air-breathing pulse detonation engine with inner diameters of 50mm based on the semi-free-jet simulated ground experiments.Gasoline was used as the liquid fuel and the air was supplied upstream of the air inlet by a semi subsonic free flow field.Six assembled induction systems were employed to investigate the effects of some geometry parameters,such as inlet area,blockage ratio of circumferential seam,length of conical inner body,on PDE performance.The results indicated no matter which induction system was used,PDE can be initiated by one-step with low-energy ignition system（less than 50mJ）.The average thrust of PDE with six all assembled inlet systems increased as the operation frequency increased,while the increasing ratio of average thrust was faster when the area of coming air injector and inlet were both less.As the blockage ratio of circumferential seam increased,the PDE average thrust decrease slightly.