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本文利用数值模拟方法在不同雷诺数、自由来流湍流度(FSTI)下对某高负荷低压涡轮叶型边界层转捩流动进行了数值模拟,并与实验测试结果进行了对比。结果表明:该转捩模型在不同的雷诺数和FSTI情况下均可以得到满意的数值计算结果,而仪仪利用湍流模型得不到合理的计算结果;当进口特征雷诺数较低时,叶型表面长分离泡的出现在很大范围内改变了壁面处的静压分布;随着自由来流湍流度的提高,叶型吸力面分离点的位置靠后且其对应的再附点位置靠前,即分离泡长度较短,高来流湍流度可以减小叶型吸力面的分离区域,减小叶型损失。而较低的自由流湍流度则在叶型尾缘对应着较长的分离泡,增大了流动分离再附的预测难度。
In this paper, numerical simulation is used to simulate the flow around a high load and low pressure turbine blade boundary layer under different Reynolds numbers and free flow turbulence (FSTI), and compared with experimental results. The results show that the turbulence model can get satisfactory numerical results under different Reynolds number and FSTI conditions, but the turbulence model can not get a reasonable calculation result. When the inlet Reynolds number is low, The emergence of long-surface-separated bubbles changed the distribution of static pressure in the wall to a large extent. With the increase of free-flow turbulence, the position of the separation point of the suction surface of the airfoil and the corresponding point of re-attachment , That is, the length of the separation bubble is short and the high turbulence degree can reduce the separation area of the leaf suction surface and reduce the loss of the leaf type. The lower turbulence of free flow corresponds to a longer separating bubble at the trailing edge of the blade, which increases the prediction difficulty of separating and re-attaching the flow.