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采用高频响动态压力探针测量了小流量轴流/离心组合压气机的旋转失速和喘振,并采用基于Morlet小波时频分析和小波系数奇异分解的方法分析了压气机失速信号.研究结果表明:稳定工况下,频率分量较多、幅值较小.失速工况下,特征频率能量较大、且成倍频关系.在该组合压气机的失稳过程中,并没有引起大幅度的压力脉动.压气机光滑地从失速前出现的模态波过渡到完全失速.周向存在2个失速团,失速团传播速度约为44.8%～45.9%转速.
The high frequency dynamic pressure probe was used to measure the rotational stall and surge of a small flow axial / centrifugal combined compressor, and the compressor stall signal was analyzed based on Morlet wavelet time-frequency analysis and wavelet coefficient singularity decomposition. The results show that under steady conditions, the frequency components are large and the amplitude is small.When stalling, the characteristic frequency energy is larger and the relationship is multiplied.With the instability of the combined compressor, Of the pressure pulsation.The compressor smoothly transition from the mode wave appeared before stalling to complete stalling.There are two stalling groups in the circumferential direction and the propagation speed of the stalling group is about 44.8% -45.9%.