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通过尾缘喷气模型与涡轮叶栅流场计算及附面层参数的关联 ,初步提供了能较为准确预测尾缘冷气喷射对尾迹参数分布规律及气动性能影响的理论预测系统。对半开缝和对开缝两种尾缘冷气喷射的研究表明 :喷气流量比增大时 ,两种不同形式叶栅的能量损失系数都有先减小后增大的趋势 ;在相同条件下 ,半开缝叶栅的能量损失系数比对开缝在相应条件下的要稍小一些 ;尾缘喷射对于叶栅的平均出口气流角的影响很小
Based on the calculation of the flow field of turbine cascade and the calculation of the flow field of the turbine cascade and the parameters of the surface layer, a theoretical prediction system which can predict more accurately the influence of the trailing edge air-jet on the wake distribution and the aerodynamic performance is provided. The research on the cold air injection at the two trailing edges of the semi-open seam and the split seam shows that when the jet flow ratio increases, the energy loss coefficients of the two different types of cascades first decrease and then increase. Under the same conditions , The energy loss coefficient of the half-slotted cascade is slightly smaller than that of the corresponding slot under the corresponding conditions. The influence of the trailing-edge jet on the average outlet airflow angle of the cascade is small