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给出了自激脉动燃烧系统产生的燃烧振荡的实验结果。稳定的燃料和空气供给仍能产生燃烧振荡,并且可以通过调节去耦室压力来控制燃烧振荡,而不需要机械阀或空气阀。风机用于控制去耦室内相对压力,调节范围从-10～10kPa。测量了燃烧器沿轴向的温度和压力以及尾管出口处的烟气成分。实验观察及测量表明:在功率和当量比不变时,燃烧室及尾管温度、燃烧室平均压力、燃烧器的热效率随去耦室压力升高而升高;当去耦室压力高于或低于大气压力时,尾管中的传热系数可以提高10%～28%。
The experimental results of the combustion oscillation generated by the self-excited pulsating combustion system are given. A stable fuel and air supply still produces combustion oscillations and the combustion oscillations can be controlled by adjusting the decoupling chamber pressure without the need for a mechanical or air valve. The fan is used to control the relative pressure in the decoupling chamber, and the adjustment range is from -10 to 10kPa. The axial temperature and pressure of the burner and the composition of the flue gas at the exit of the tailpipe were measured. The experimental observations and measurements show that the combustion chamber and the tail pipe temperature, the average pressure of the combustion chamber and the thermal efficiency of the combustor increase with the pressure in the decoupling chamber when the power and equivalence ratio are constant. When the pressure in the decoupling chamber is higher than Below atmospheric pressure, the heat transfer coefficient in the tailpipe can be increased by 10% to 28%.