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以汽油为燃料,空气为氧化剂,在内径为60mm的吸气式脉冲爆震发动机上进行了反压传播规律实验研究。测量了10～30Hz频率范围内进气道内的反传压力。实验结果表明,进气道内的反压峰值随着工作频率的增加而增加,两者基本呈线性关系。随着工作频率的增加,压力波动的时间占每个工作循环时间的比例增加。压力脉动比在20Hz时达到最大。建立了数值模型,采用小能量点火及温度梯度自适应方法,计算得到了反压的形成及传播特性。计算结果印证了反压是由于回传爆震引起的。将计算结果与实验结果进行了比较,结果表明两者符合地较好。
Using gasoline as fuel and air as oxidant, experimental study on the law of back pressure propagation was carried out on an aspirated pulse detonation engine with an inner diameter of 60 mm. The back pressure in the inlet was measured in the frequency range of 10 ~ 30Hz. The experimental results show that the peak value of back pressure in the inlet increases with the increase of operating frequency, and the two are basically linear. As the operating frequency increases, the pressure fluctuation time increases in proportion to each duty cycle. Pressure pulsation ratio reaches its maximum at 20 Hz. A numerical model was established. The formation and propagation characteristics of back pressure were calculated by using small energy ignition and temperature gradient adaptive method. The result of the calculation confirms that the back pressure is caused by the return knocking. Comparing the calculated results with the experimental results, the results show that the two are in good agreement.