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对将双射流引入高压涡轮导向器叶栅进行了二维数值研究。在叶栅出口为高亚声速和超声速条件下,对三种具有不同曲率尾缘的环量控制叶栅,采用在吸力面和压力面各加一股射流的双射流方式对叶栅的气动性能进行探讨。结果表明:叶栅出口气流马赫数为0.6和1.1时,采用双射流方案取得了好于单射流的出口气流角和膨胀比,但由于多加了一股射流,能量损失有所增加;马赫数为0.85时,单射流结构的环量控制涡轮叶栅气动性能已经比较好,再加入一股射流对叶栅的气动性能没有明显改善;双射流条件下,压力面射流后方存在低压区,使得在叶栅尾缘曲率较大时,吸力面射流也保持了较好的附壁效果。
The two-dimensional numerical study of introducing double jets into the high-pressure turbine guide cascade was carried out. Under the conditions of high subsonic speed and supersonic speed at the outlet of cascade, three types of cascade cascades with different curvature trailing edges were used to simulate the aerodynamic performance of the cascade by using double jets with one jet on the suction side and the pressure side respectively. To explore. The results show that the outlet airflow angle and expansion ratio are better than the single jet flow when the air flow Mach number is 0.6 and 1.1, respectively. However, the jet loss increases with the increase of jet pressure. The Mach number is 0.85, the aerodynamic performance of the turbine cascade controlled by the single-jet structure is good, and the aerodynamic performance of the cascade is not improved obviously when one jet is added. Under the condition of double-jet flow, the low-pressure zone exists behind the jet of pressure so that When the curvature of the gate trailing edge is large, the suction surface jet also maintains a good Coanda effect.