回流型脉冲爆震燃烧室工作特性分析

Operating Characteristics of a Reverse Flow Pulse Detonation Combustor

关键词:  脉冲爆震  回流型脉冲爆震燃烧室  工作特性  增压比  燃气温度

Key words:  Pulse detonation  Reverse flow pulse detonation combustor  Operating characteristic  Pressure ratio  Gas temperature

摘要:

为了获得回流型脉冲爆震燃烧室在不同工作频率下的工作特性，通过试验和数值相结合的方法对该爆震室工作频率10~30Hz时的出口燃气总压、总温、流量变化规律以及该爆震室的增压能力进行了测试与计算分析。结果表明：出口燃气总压、总温具有极高的峰值和较高的平台区，其工作频率10~30Hz时，压力平台值为0.36~0.91MPa，时均温度为710~1270K。此外，该爆震室排气流量十分集中，以10Hz为例，在一个爆震循环的16%时间内，排出了整个循环60.5%的燃气。为此对出口燃气总压进行质量加权平均，发现该爆震室的增压比随工作频率的增加而降低，在2.05~2.37。

Abstract:

In order to obtain the operating characteristics of the reverse flow pulse detonation combustor at different operating frequencies， the change rule of outlet total pressure， total temperature and flow rate and the boosting capability of the detonation combustor were measured and calculated when the operating frequency is 10 ~ 30Hz. The results show that the total pressure and total temperature of outlet gas have very high peak value and high platform area. When the operating frequency of the detonation chamber is 10 ~ 30Hz， the pressure platform value is 0.36 ~ 0.91MPa， and the time-average temperature is 710 ~ 1270K. In addition， the exhaust flow is very concentrated. Taking 10Hz as an example， 60.5% of the gas in a whole cycle is discharged in 16% duration of a detonation cycle. Therefore， the mass weighted average of the total pressure of the outlet gas is carried out. The results show that the pressure ratio of the detonation chamber decreases with the increase of operating frequency. The variaion range of the pressure ratio is between 2.05 and 2.37.