高温来流下U型脉冲爆震燃烧室燃烧特性试验

为了获得高温来流下气/液两相多循环U型脉冲爆震燃烧室(U-PDC)的燃烧特性,使用汽油/空气为燃料和氧化剂开展了相关试验研究.结果表明:当来流温度为373 K,U-PDC能够在15～38 Hz范围内稳定工作,且随着工作频率提高爆燃向爆震转变(DDT)距离缩短;在室温条件下、工作频率为15～25 Hz时,未能形成充分发展...

Experiment on combustion characteristics of U-bend pulse detonation combustor under high temperature inlet stream

In order to obtain the combustion characteristics of gas-liquid two-phase multi-cycle U-bend pulse detonation combustor （U-PDC） under high temperature inlet stream，experimental research was carried out by using gasoline and air as fuel and oxidant.The results indicated that the U-PDC can achieve stable operation at the working frequency of 15-38 Hz when the inlet temperature was 373 K，and the deflagration to detonation transition （DDT） distance was shortened when the working frequency increased.When the working frequency was 15-25 Hz，the detonation initiation failed at room temperature.The results showed that high temperature inflow can promote the DDT process.At room temperature and working frequency of 15-25 Hz，due to the uneven distribution of combustible gas in the U-bend detonation tube，the time when the flame was detected outside of the U-bend detonation tube was later than the exit of the U-bend detonation tube.When the inflow temperature increased to 373 K，the phenomenon was obviously improved.In addition，the ignition time of U-PDC was within 3-10 ms，which was greatly affected by ignition delay time.When the working frequency of U-PDC was the same and the inlet stream temperature raised from room temperature to 373 K，the wave velocity increased，and the ignition time decreased.