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本文介绍的气冷涡轮性能预测是以一元特性计算方法为基础的,其中考虑了涡轮叶栅的叶型损失、二次流损失、漏气损失和尾缘损失,还引入了气冷涡轮的掺混损失。并将损失模型计算的不同攻角的损失系数分布与CFD模拟结果进行了对比。根据涡轮级动叶不同的工作状态,选取不同的自变量组合形式,使其能够用于计算亚音速、跨音速、有冷却和无冷却涡轮的性能。最后针对某型涡轮给出了性能预测结果。
The air-cooled turbine performance prediction presented in this paper is based on the calculation of a univariate characterization, taking into account the blade-type loss, secondary flow loss, blow-by loss and trailing edge loss of the turbine cascade, as well as the incorporation of air- Mixed loss. The distribution of loss coefficients at different angles of attack calculated by the loss model is compared with the results of CFD simulation. According to the different operating states of the turbine-stage buckets, different combinations of independent variables are selected so that they can be used to calculate the performance of subsonic, transonic, cooled and non-cooled turbines. In the end, the performance prediction of some turbine is given.