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实验研究了低速条件下局部附面层吸除对高负荷扩压叶栅气动性能的影响.采用五孔气动探针测量了叶栅出口截面气动参数,并对叶片表面静压进行了测量,详细分析了局部吸气方式、吸气量和吸气位置对叶栅出口截面总压损失和负荷能力的影响.结果表明,采用吸力面两端吸气和中间吸气方式均能够有效吸除叶栅流道内低能流体,增加叶栅的气动负荷,从而提高叶栅的气动性能;采用吸力面两端吸气对叶栅气动性能的改善要优于吸力面中间吸气;叶栅气动性能的改善主要在靠近叶展中部区域,而对角区核心区和端部区域的影响并不明显.
The effect of toposphere suction on the aerodynamic performance of high-load diffuser cascade under low-speed conditions was experimentally studied.The aerodynamic parameters at the exit of cascade were measured by a five-hole aerodynamic probe and the static pressure at the blade surface was measured in detail The effects of partial suction mode, suction amount and suction position on the total pressure loss and load capacity of exit section of cascade are analyzed. The results show that both suction side and suction side of suction side can effectively suck cascade The low-energy fluid in the flow channel increases the aerodynamic load of the cascade and improves the aerodynamic performance of the cascade. The improvement of the aerodynamic performance of the cascade is better than that of the suction side by adopting the suction at both ends of the suction surface. The improvement of the aerodynamic performance of the cascade It is close to the central part of leaf blade, while the influence of core area and end part of diagonal area is not obvious.