缝式处理机匣轴向位置对压气机特性影响的机理研究

文中对轴向倾斜缝处理机匣轴向位置的改变如何影响轴流压气机性能进行研究。试验与数值结果均表明三个轴向位置的机匣处理均扩宽压气机的稳定工作范围，轴向位置不变时扩稳效果最好，轴向位置后移的最差。同时轴向位置前移或后移使压气机等熵效率损害程度降低。通过详细地分析压气机内部流场表明：机匣处理轴向位置后移使叶顶机匣约1/3的轴向弦长宽度无机匣处理，因此不能抑制叶顶泄漏流的发展，后移处理机匣缝的抽吸能力弱，致使扩稳效果差；与处理机匣轴向位置未变的比较，轴向位置前移或后移能够减少了间隙流及二次流带来的流动损失，并使叶顶加功量上升，使压气机转子等熵效率提高。

The mechanism of investigation of influences of Axial positions of axial Skewed Slot Casing Treatment on a compressor performance

Two Investigations were performed on an axial-flow compressor rotor to explore the effects of axial positions of axial skewed slot Casing Treatment on the rotor performance. The steady operating range of compressor rotor was extended and the compressor efficiency was reduced with all casing treatments in the experimental and numerical investigations. The ability to improve the rotor steady operating range was the best when the axial position of casing treatment was unchanged. The ability was depressed obviously with moving the axial position of casing treatment backward. The degree of damage on compressor isen-tropic efficient was decreased when the axial position of casing treatment was moved forward or backward. The detailed analyses of the flow-filed in compressor with casing treatment indicated that: the development of tip leakage vortex could not been re-strained with moving the axial position of casing treatment backward and the pumping ability of slot was reduced likewise, which weakened the effect of extending the steady operating range of compressor; The work of blade forcing on air in the blade tip was not only increased but also the flow loss rooted in tip leakage flow and secondary flow were reduced when the axial position of casing treatment was moved forward or backward, which made the rotor isentropic efficiency increase comparing the slot with axial position unchanged.