两级脉冲爆震发动机防止压力和温度反传研究

为解决两级脉冲爆震发动机中压力和温度反传的问题,提出了2种不同结构形式的射流喷管:倒板结构射流喷管和倒台结构射流喷管。以H_2/O_2/N_2混合气为介质,对不同倒板或倒台层数情况下激波聚焦起爆爆震过程进行了数值模拟,并揭示其影响规律。结果表明:倒板层数为3层、4层时成功起爆爆震,倒台层数为3层、4层、5层时成功起爆爆震;倒板或倒台层数为4层时激波聚焦起爆效果最好,且在降低反传压力和温度方面效果相对较好;实际上倒板或倒台对防止压力和温度反传的作用较为有限。

Investigation on Preventing Pressure and Temperature Back Propagation in Two Stage Pulse Detonation Engine

In order to solve the problem of pressure and temperature back propagation in two stage pulse detonation engine, this paper proposes two different kinds of jet nozzles with several planks or bosses. And with hydrogen as fuel and air as oxidizer, detonation initiation with different planks or bosses is simulated. The results indicate that detonation can be initiated when the number of planks is 3 or 4. When the number of bosses is 3, 4 or 5, detonation can be initiated successfully. When the number of planks or bosses is 4, the detonation initiation effect is the best by shock wave focusing, and the effect of preventing pressure and temperature back propagation is also well. On the whole the effects of planks or bosses on preventing pressure and temperature back propagation is very limited.