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对轴流压气机转子机匣壁面静压进行动态测量,采用小波分析方法处理近失速工况动态压力测量信号,功率谱显示在与二次涡相近的频率上存在较高的能量带,能量峰值沿轴向的衰减与二次涡的变化规律相符,表明二次涡在流场中存在是可能的。针对相同转子进行全通道非定常数值模拟,计算结果表明,近失速工况下,转子圆周每个通道叶顶附近均存在规律一致的二次涡运动。叶片中后段间隙泄漏流与间隙泄漏涡破碎产生的低能流体相互作用,在泄漏涡破碎形成的堵塞区域中形成二次涡。二次涡运动使得近叶顶载荷分布发生变化,从而导致近叶顶流场出现了一种周期性的自维持的非定常流动现象。
The static pressure of axial compressor rotor casing is measured dynamically. The dynamic pressure measurement signal of near-stall condition is processed by wavelet analysis. The power spectrum shows that there is a higher energy band at the frequency near the secondary vortex. The energy peak The attenuation in the axial direction is consistent with the variation of the secondary vortex, indicating that it is possible for the secondary vortex to exist in the flow field. For the same rotor, an all-channel unsteady numerical simulation is carried out. The calculation results show that there is a regular quadratic vortex motion around the tip of each channel near the rotor circumference under near-stall conditions. The leakage flow in the backsection of the vane interacts with the low-energy fluid produced by the breakage of the leakage vortex in the vane, forming a secondary vortex in the clogged area formed by the crushing of the leakage vortex. The secondary vortex movement changes the near-tip load distribution, resulting in a periodic self-sustaining unsteady flow in the tip-top flow field.