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采用机匣壁动态压力测量技术对某高速亚音轴流压气机转子中转数可压条件下不同工况点叶尖流场进行了测量。在对试验测量结果进行详细分析的基础上,结合全通道定常数值模拟结果对试验观察到的流动现象进行了解释。结果表明:随着工况点从大流量向近失速工况推进,主流和间隙流交接面位置向叶片前缘平面推进,这是试验测量态压力FFT分析中的整个带宽范围的高幅值区向叶片前缘平面移动的原因。当工况点推进到近失速边界的某一点时,位于叶片通道中的动态压力传感器感受信号的FFT分析中均发现了低于叶片通过频率的一定带宽的高幅值区,这表明近叶尖流场出现了类似于“旋转不稳定性”的非定常流动现象。
The flow field at the tip of a certain high speed subsonic compressor at different operating conditions was measured by dynamic pressure measurement of the casing wall. Based on the detailed analysis of the experimental measurement results, the flow phenomenon observed in the experiment is explained based on the results of the constant numerical simulation of all channels. The results show that as the operating point progresses from large flow to near stalling condition, the position of the interface between the mainstream and the clearance flow advances toward the leading edge of the blade, which is the high amplitude region of the whole bandwidth in the experimental measurement pressure FFT analysis The reason for moving to the blade leading edge plane. As the operating point progresses to a point near the stalling boundary, a high-amplitude region of a certain bandwidth lower than the blade pass frequency is found in the FFT analysis of the dynamic pressure sensor feel signal in the vane channel, indicating that the proximal tip Flow field appeared similar to the “rotation instability ” unsteady flow phenomenon.