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应用商用流体计算软件求解定常雷诺平均N-S方程组耦合Lantry-Menter转捩模型,对来流湍流度1.5%,不同进口雷诺数下,前加载超高负荷低压涡轮叶型进行了数值模拟。在与相关实验数据对比的基础上,研究了三种被动控制方式的控制效果与控制机理。结果表明:弧形凹槽的最佳开槽位置在分离点,最佳深宽比为0.15,表面拌线和矩形条的最佳加载位置在速度峰值点与分离点的中点;控制方式能否有效与其增加的掺混损失和减少的分离损失有关;三种控制方式均通过产生小漩涡来增加低能流体与高能流体之间的交换,从而加速转捩减小分离泡降低叶型损失。
The commercial Lancome-Menter transition model was used to solve the steady-state Renault average N-S equations coupled with commercial fluid calculation software. Numerical simulations were carried out on the turbine blades with ultra-high load and low pressure before 1.5% turbulence and different inlet Reynolds numbers. Based on the comparison with the relevant experimental data, the control effects and control mechanisms of the three passive control modes are studied. The results show that the optimal groove position of the arc groove is at the separation point, the best aspect ratio is 0.15, and the optimum loading position of the surface mixing line and the rectangular strip is at the midpoint between the peak speed and the separation point. No effect is related to the increase of blending loss and the decrease of separation loss. All three control modes increase the transition between low-energy fluid and high-energy fluid by generating small vortex to accelerate the transition, reduce the separation bubble and reduce the leaf loss.