轴流压气机转子旋转不稳定性检测及机理探讨

发布时间：2019-02-28 18:17

【摘要】：为了探究固定通道中叶尖泄漏流非定常性引起旋转不稳定性(RI)的物理机理,以轴流压气机转子为研究对象分别进行试验和数值研究。通过对机匣壁动态压力信号的分析获取其叶尖流场的非定常特征,发现RI仅在靠近失速边界的狭窄的流量范围工况出现,RI的模态随时间变化。在此基础,采用五通道的数值模拟方法对该转子的内部流场进行了研究。结果表明,数值模拟流场中出现的静压扰动的变化规律和频率特征与试验测量结果一致,多通道的数值模拟成功地预测出RI产生的过程。进一步的流场分析表明,固定通道中出现了泄漏流自诱导非定常性,其对通道压力面近叶尖区压力分布的影响使得相邻叶片的泄漏流也出现自诱导非定常性,该过程在叶尖环面沿周向传播导致了RI现象的出现。
[Abstract]:In order to investigate the physical mechanism of rotating instability (RI) caused by unsteady tip leakage flow in a fixed channel, the axial flow compressor rotor was used for experimental and numerical studies respectively. The unsteady characteristics of the blade tip flow field are obtained by analyzing the dynamic pressure signal of the box wall. It is found that the RI appears only in the narrow flow range near the stall boundary, and the mode of RI changes with time. On this basis, the internal flow field of the rotor is studied by using a five-channel numerical simulation method. The results show that the variation rule and frequency characteristics of the static pressure disturbance in the numerical simulation flow field are consistent with the experimental results. The multi-channel numerical simulation successfully predicts the process of RI generation. Further analysis of the flow field shows that the leakage flow self-induced instability occurs in the fixed channel, and the influence of the leakage flow on the pressure distribution near the tip of the channel makes the leakage flow of the adjacent blades also appear self-induced instability. This process propagates in the circumferential direction of the tip torus leading to the appearance of RI phenomenon.
【作者单位】：西北工业大学动力与能源学院;先进航空发动机协同创新中心;
【基金】：国家自然科学基金(11572257、51536006、51276148) 航空科学基金(2015ZB53027)
【分类号】：TH45

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