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针对典型高压涡轮叶型平面叶栅压力面气膜冷却,采用数值模拟方法,比较分析了不同冷气进口方式对计算结果的影响,并对冷气入射角度等参数对叶栅流场和性能的影响规律进行了研究。结果表明,在没有考虑二次流流动影响情况下,平面叶栅中通过管道给定冷气进口和直接在叶片表面给定冷气进口这两种方式对气膜冷却数值模拟结果影响很小,能量损失系数的差别仅为1%左右。冷气入射增加了叶栅损失,但能量损失系数与冷气入射角度并不是简单的单调关系,在入射角度从15°到60°的变化范围内,能量损失系数存在最小值,对应冷气入射角度在30°左右。
Aiming at the film cooling of the pressure surface of a typical high pressure turbine blade plane cascade, numerical simulation is used to analyze the influence of different inlet modes on the calculation results. The influences of the incident angle and other parameters on the flow field and performance of the cascade are also analyzed Were studied. The results show that without considering the influence of the secondary flow, the two methods of air-cooling inlet in a plane cascade given the inlet of the cold air through the pipeline and the direct air-inlet at the blade surface have little effect on the numerical simulation of the film cooling, and the energy loss The difference between the coefficients is only about 1%. However, the energy loss coefficient is not a simple monotonic relationship with the incident angle of the cold air. The energy loss coefficient has the minimum value within the range of 15 ° to 60 ° of the incident angle, corresponding to the incident angle of the cold air at 30 about.