高亚声速吸附式叶栅气动特性实验研究

Experimental Research on Performance of High Subsonic Aspirated Cascade

关键词:  吸附式叶栅  附面层抽吸  攻角特性  扩散因子

Key words:  Aspirated cascade  Boundary layer suction  Incidence characteristic  Diffusion factor

摘要:

以高亚声速叶栅风洞为实验平台，建立了附面层抽吸系统，针对吸力面开槽的吸附式叶栅进行了系统的平面叶栅吹风试验。定量地分析了附面层抽吸对于叶栅气动特性的影响。试验结果表明，抽吸槽的存在恶化了叶型攻角特性，总压损失系数平均升高了70%。通过附面层抽吸可以明显地减小栅后气流尾迹，改善叶型攻角特性。与原始叶型相比，当各工况抽吸流量处于实验最佳值时，吸附式叶型总压损失系数平均降低了20.5%，叶型扩散因子在来流为设计进口马赫数0.6时平均提高了70.7%。

Abstract:

Boundary layer suction(BLS)system has been built on the basis of a continuous high subsonic wind tunnel. With the experimental facilities，aspirated cascade with slot on suction surface has been tested systematically. Effects of BLS on the performance of aspirated cascade are analyzed quantitatively. Results show that suction slot has an adverse effect on incidence characteristic of cascade，total pressure loss coefficient increases by 70% in average under the test conditions. Through BLS，wake of cascade is weakened，and the performance of cascade is improved at each incidence. When every comparative massflow has the best experimental value，total pressure loss coefficient decreases by 20.5%，diffusion factor with designed inlet Mach number 0.6 improves by 70.7% in average.