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用非对称马赫1.98的隔离段直连实验研究了不同波形不同频率的脉动反压对隔离段内流动的影响。实验结果表明:隔离段能有效地隔离不同频率不同波形周期性反压脉动对上游进气道的影响;反压脉动以第二特征波速向上游传播,但在激波振荡区域,压力脉动主要受激波振荡的影响;厚附面层一侧的下壁面激波振荡区域内压力脉动前传时以指数规律衰减,衰减的程度随着频率和波形的改变而改变。而薄附面层的上壁面激波振荡区域内压力脉动前传时不是单调下降,而是波动的。
The influence of the pulsating backpressure on the flow in the isolated section with different frequencies and different frequencies was studied experimentally by using the asymmetric Mach 1.98 isolator. The experimental results show that the isolation section can effectively isolate the influence of periodic backpressure pulsations of different waveforms at different frequencies on the upstream inlet port. The back pressure pulsation propagates upstream at the second characteristic wave velocity. However, in the shock oscillation region, the pressure pulsation is mainly affected by Shock wave oscillation. When the pressure pulsation in the oscillation area of the lower wall on the thick surfacing side attenuates exponentially, the degree of attenuation changes with the change of frequency and waveform. However, when the pressure pulsation in the area of shock wave on the upper wall of the thin attachment surface is not monotonically decreasing, it fluctuates.