为研究处理机匣对压气机总体性能、叶顶流动非定常性以及旋转不稳定性的影响，基于圆弧斜缝处理机匣对一台单级低速轴流压气机叶顶泄漏流进行被动控制.通过实验对不同工况下的叶顶脉动压力进行频谱分析，并对比机匣处理前后压气机性能以及转子叶顶区域流场特性的变化.结果表明：圆弧斜缝处理机匣能够使压气机获得6.8%的失速裕度提升量，抑制旋转不稳定性现象对应的频谱上的宽频带凸起，推迟泄漏涡的起始位置，进而消除了跨越相邻叶片周向传播的流动现象.斜缝内形成的回流能够抽吸低速流体，减少流道堵塞，改善叶顶的通流能力.
To explore the influence of casing treatment on compressor overall performance, flow unsteadiness, and rotating instability (RI) at blade tip region, arc-curve skewed slot casing treatment is applied to the passive control of the tip clearance flow of a single-stage low-speed axial compressor. The spectrum analysis of blade tip fluctuating pressure under different operating conditions is conducted, and the changes of performance and flow field characteristics at rotor tip region before and after casing treatment are compared. The results show that arc-curve skewed slot casing treatment could increase stall margin by 6.8%, suppress the broadband hump in the frequency spectrum caused by RI, delay the starting position of the leakage vortex, and eliminate the circumferential flow propagation across adjacent blades. The backflow formed in the skewed slot can suck low-velocity fluid, reduce the blockage in the flow passage, and improve the flow capacity near blade tip.
［1］KOCH C C. Experimental evaluation of outer case blowing or bleeding of single stage axial flow compressor, part VI: Final report［R］. Lynn, USA: NASA, 1970.
［2］OSBORN W M, LEWIS JR G W, HEIDELBERG L J. Effect of several porous casing treatments on stall limit and on overall performance of an axial flow compressor rotor［R］. Lynn, USA: NASA, 1971.
［3］OSCARSON R P, WRIGHT D L. Experimental evaluation of a honeycomb rotor shroud configuration to improve the stall margin of a 0.5 hub-tip ratio single-stage compressor. Volume 2: Data supplement［R］. Lynn, USA: NASA, 1970.
［4］MOORE R D, KOVICH G, BLADE R J. Effect of casing treatment on overall and blade element performance of a compressor rotor［R］. Lynn, USA: NASA, 1971.
［5］BAILEY E E. Effect of grooved casing treatment on the flow range capability of a single-stage axial-flow compressor［R］. Lynn, USA: NASA, 1972.
［6］FUJITA H, TAKATA H. A study on configurations of casing treatment for axial flow compressors［J］. Bulletin of JSME, 1984, 27(230): 1675-1681.
［7］DANNER F C, KAU H P, MULLER M M, et al. Experimental and numerical analysis of axial skewed slot casing treatments for a transonic compressor stage［C］∥ASME Turbo Expo 2009. Orlando, USA: American Society of Mechanical Engineers, 2003: 227-238.
［8］楚武利, 朱俊强, 刘志伟. 折线斜缝式机匣处理的实验研究及机理分析［J］. 航空动力学报, 1999, 14(3): 270-274.
CHU Wuli, ZHU Junqiang, LIU Zhiwei. Experimental research and analysis of sloped slotted casing treatment［J］. Journal of Aerospace Power, 1999, 14(3): 270-274.
［9］WILKE I, KAU H P. A numerical investigation of the flow mechanisms in a HPC front stage with axial slots［C］∥ASME Turbo Expo 2003. Atlanta, USA: American Society of Mechanical Engineers, 2003: 456-477.
［10］LU X, CHU W, ZHU J, et al. Numerical investigations of the coupled flow through a subsonic compre-ssor rotor and axial skewed slot［J］. Journal of Turbomachinery, 2009, 131(1): 011001.
［11］EMMRICH R, HNEN H, NIEHUIS R. Time resolved experimental investigations of an axial compressor with casing treatment［J］. Journal of turbomachinery, 2009, 131(1): 011018.
［12］张皓光, 楚武利, 吴艳辉, 等. 轴向倾斜缝机匣处理影响压气机性能的机理［J］. 推进技术, 2010, 31(5): 555-561.
ZHANG Haoguang, CHU Wuli, WU Yanhui. et al. Investigation of the flow mechanisms of affecting compressor performance with axial skewed slots casing treatment［J］. Journal of Propulsion Technology, 2010, 31(5): 555-561.
［13］张皓光, 楚武利, 吴艳辉. 缝式处理机匣轴向位置对压气机特性影响的机理［J］. 航空动力学报, 2011, 26(1): 92-98.
ZHANG Haoguang, CHU Wuli, WU Yanhui. Mechanism of influences of axial positions of axial skewed slot casing treatment on a compressor performance［J］. Journal of Aerospace Power, 2011, 26(1): 92-98.
［14］张皓光, 安康, 楚武利, 等. 角向倾斜缝处理机匣对压气机性能的影响［J］. 推进技术, 2018, 39(6): 1260-1266.
ZHANG Haoguang, AN Kang, CHU Wuli. et al. Effects of blade-angle skewed slots casing treatment on compressor performance［J］. Journal of Propulsion Technology, 2018, 39(6): 1260-1266.
［15］WANG H, WU Y D, OUYANG H, et al. Circumferential propagating characteristics of tip leakage flow oscillation and its induced rotating pressure wave［J］. Proceedings of the Institution of Mechanical Engineers, Part A: Journal of Power and Energy, 2016, 230(4): 374-387.
［16］WANG H, WU Y D, OUYANG H, et al. Investigations of rotating instability and fluctuating tip clearance flow in a low-speed axial compressor［J］. Proceedings of the Institution of Mechanical Engineers, Part G: Journal of Aerospace Engineering, 2016, 230(6): 981-994.
［17］王昊, 吴亚东, 欧阳华. 低速轴流压气机中气动旋转不稳定性和叶顶泄漏流脉动特性［J］. 航空动力学报, 2016, 31(9): 2239-2250.
WANG Hao, WU Yadong, OUYANG Hua, et al. Aerodynamic rotating instability and fluctuated cha-racteristics of tip clearance flow in low speed axial compressor［J］. Journal of Aerospace Power, 2016, 31(9): 2239-2250.
［18］朱铭敏. 轴流压气机轴向缝类机匣处理设计策略研究［D］. 上海: 上海交通大学, 2018.
ZHU Mingmin. Investigation of design strategies for axial slots casing treatment in axial compressors［D］. Shanghai: Shanghai Jiao Tong University, 2018.
［19］HUNT J C R, WRAY A A, MOIN P. Eddies, streams, and convergence zones in turbulent flows［C］∥Proceedings of the Summer Program. USA: Stanford University, 1988: 193-208.
