上游转子对下游静子叶片气动力的影响

为了研究轴流压气机上游转子对下游静子干扰产生的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,在一台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。测量覆盖了不同轴向间距、不同转速下从近堵塞到近失速的宽广范围,并对实验测量得到的静子叶片非定常气动力进行离散傅里叶变换,以分析其频谱特性。通过对实验结果的分析,初步认识了流量、轴向间距及转速等因素对轴流压气机转/静干扰影响的规律。

Effects of Up-stream Rotor on the Aerodynamic Force on Down-stream Stator Blades

To study the amplitude and frequency of the aerodynamic force on stator blades,micro-sensors are buried under the surface of stator blades of a low-speed single-stage axial compressor to measure the unsteady pressure on blades.The measure covers different axial spacings between rotor and stator,different speeds and an extensive range of massflow.And the amplitudes and frequencies of aerodynamic forces are analysed by means of Fourie Transform.Under the effects of rotor wake,the dominant frequencies of pressure fluctuations on stator blades are the rotor blade passing frequency and its harmonics.But in the fore part of suction side,the higher harmonics of the rotor blade passing frequency are more prominent than those in other parts of stator blade.Otherwise,the fluctuations of pressure as well as the aerodynamic force on stator blades intensify with the decrease in the mass flow,the increase in the rotate speed or the decrease in the axial spacing between rotor and stator.