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为进一步优化设计工作做准备,以基于主/被动联合控制技术设计的高负荷扩压叶栅作为研究对象,在进口为高亚声速的条件下,利用数值模拟的方法,详细研究了冲角变化对扩压叶栅壁面流谱以及气动损失的影响。结果表明,负冲角下,后列叶栅内部存在较大尺度的角区分离流动,构成叶栅损失的主要来源;随着冲角增加,流经串列叶栅近端壁处缝隙流道内流体的相对动量增强,后列叶栅角区分离流动受到抑制,端区二次流动损失降低,+3°冲角下,上、下20%叶展区域内总压损失分别降低了4.4%、6.8%,但前列叶栅叶型分离流动加剧,主流区损失增加;合理协调端壁附面层抽吸技术与串列叶栅技术的应用是提升高负荷扩压叶栅全工况气动性能的关键。
In order to prepare for the further optimization of the design work, a high-load diffuser cascade designed based on the main / passive joint control technology is taken as the research object. Under the condition of high subsonic inlet velocity, numerical simulation is used to study the variation of the angle of attack Effects of diffuser cascade wall flow spectrum and aerodynamic losses. The results show that there is a large-scale angular separation flow in the back cascade under the negative impingement angle, which is the main source of the cascade loss. As the impingement angle increases, it flows through the crevice flow channel near the cascade cascade The relative momentum of the fluid is enhanced, the segregation flow in the rear cascade is restrained, the secondary flow loss in the end zone is reduced, and the total pressure loss in the upper and lower 20% %, But the separation flow of front cascade leaves aggravate and the loss of mainstream increases. The reasonable coordination of application of cascade suction cascade and tandem cascade is the key to improve the aerodynamic performance of high duty cascaded cascade .