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对三套不同折转角的低速扩压叶栅的局部损失机制进行了分析.结果表明:以较高总压损失系数为特征的分离角区仅是低能流体的集中区,以上区域与主流的相邻区才是主要的局部损失产生区.角区分离前,栅内局部损失主要由端壁附面层摩擦所致,且不同折转角下流道前部局部损失生成规律变化不大.角区分离后,角区低能流体与主流相邻区的强耗散效应使得其局部损失急剧增加,而端壁局部损失下降,但总损失增加.折转角越大,以上趋势越明显.
The local loss mechanisms of three low-speed cascades with different turning angles are analyzed.The results show that the separation angle zone characterized by a higher total pressure loss coefficient is only the concentration zone of low-energy fluid, The adjacent area is the main area of local loss before the corner zone separation, the local loss of the grid is mainly caused by the friction of the end wall cladding, and the deflection angle of the front part of the local loss of the formation of little change. After that, the strong dissipative effect of the low-energy fluid in the corner area and the main adjacent area causes the local loss to increase sharply, but the local loss of the endwall decreases, but the total loss increases.When the turning angle is larger, the above trend is more obvious.