直连式脉冲燃烧风洞起动过程研究

Investigation on the starting process of the direct impulse combustion wind tunnel

直连式脉冲燃烧风洞的起动过程是一个非常复杂的瞬态过程,采用光电测量系统和数值方法对其进行探索性研究。试验中,光电探测系统在非常短的传输距离上测出了高速起动激波的速度。通过与试验结果对比,验证了所采用的数值方法的可行性。研究表明:起动激波往下游的运动过程具有一定的规律性;由于内型面的变化导致起动激波速度在起动过程中发生变化。

The starting process of the direct impulse combustion wind tunnel was unsteady and very complex.ln this paper,the starting process has been investigated by the photoelectric system and the Fluent CFD code. The velocity of starting shock can be measured at a very short distance during the experiments. The computational method is validated by the experimental resuh. It is shown that the transmission of starting shock has some characters. The velocity of starting shock will change because of the variation of inner profile during the starting process.