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为研究轴流压气机下游静子叶片非定常气动力的大小和频率的变化规律,采用在静子叶片表面埋设微型动态压力传感器的方法,在低速单级轴流压气机实验器上进行了静子叶片表面压力的测量。测量了不同轴向间距、不同转速下从近堵塞到近失速的宽广流量范围,并对所测得的静子叶片非定常气动力进行了离散傅立叶变换,以分析其频谱特性。实验结果表明:在转子尾迹的影响下,静子叶片表面的波动频率是转子的尾迹频率及其倍频。转子尾迹频率的高频分量对静子叶片吸力面前缘的影响比对其他位置的影响大。叶片表面的非定常压力和气动力随压气机流量、转速和轴向间距的变化而变化。
In order to study the variation regularity of unsteady aerodynamic force of stator blades downstream of axial flow compressor, a micro-dynamic pressure sensor embedded in the stator blade surface was used to simulate the stator blade surface on the low-speed single-stage axial compressor. Pressure measurement. The wide range of flow rate from near to near stall at different axial distances and at different speeds was measured. Discrete Fourier transform was applied to the measured unsteady aerodynamic forces on the stator blades to analyze their spectral characteristics. The experimental results show that under the influence of the rotor wake, the fluctuation frequency of the stator blade surface is the rotor wake frequency and its multiple frequency. The influence of the high frequency component of the rotor wake frequency on the leading edge of the suction surface of the stator blade is greater than that of the other positions. Unsteady pressure and aerodynamic forces on the blade surface vary with compressor flow rate, rotational speed and axial spacing.