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准确地预测叶片吸力面层流分离诱导转捩过程是高升力、低压涡轮气动设计的关键。应用RANS方法的γ槇-Reθt转捩模型和LES方法的WALE亚格子模型对T106C高升力低压涡轮叶栅进行计算分析;比较了两种方法在不同雷诺数工况下对分离流转捩的模拟精度。结果显示,在高雷诺数工况时,γ槇-Reθt转捩模型预测结果与试验值较为一致,而在低雷诺数工况时严重低估了分离泡尺寸,与试验结果差距较大;WALE模型在高、低两种雷诺数工况下,其时均结果与试验值均吻合较好。
Accurately predicting the laminar flow induced separation in the suction side of the blade is the key to aerodynamic design of high lift and low pressure turbines. By using the γ 槇 -Reθt transition model of RANS method and the WALE sub-Lattice model of LES method, the T106C high-lift and low-pressure turbine cascades are calculated and analyzed. The simulation accuracy of the two methods in different Reynolds number conditions is compared. . The results show that at high Reynolds number, the predicted results of γ 槇 -Reθt transition are in good agreement with the experimental values, while at low Reynolds number, the sizes of isolated bubbles are greatly underestimated, which is far from the experimental results. The WALE model Under both high and low Reynolds number conditions, the time-averaged results are in good agreement with the experimental values.