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首页> 外文期刊>International Journal of Heat and Mass Transfer >Large eddy simulation of pulsed film cooling with vortex generators
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Large eddy simulation of pulsed film cooling with vortex generators

机译：涡流发电机脉冲膜冷却的大型涡流模拟

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摘要

Film cooling is an effective approach to cool the blades in a high-performance gas turbine engine. Pulsed and unpulsed film cooling with vortex generators pair (VGP) are studied using large eddy simulations. The Strouhal number of the sinusoidal coolant pulsation is 0.25, and the blowing ratio for the unpulsed cooling is M=1.0. Time-averaged and instantaneous results indicate that both the upstream installed VGP and the dynamic pulsing effect significantly improve cooling effectiveness. The passive method of VGP enhances the cooling effectiveness by generating an anticounter-rotating vortex pair (anti-CRVP), which accelerates the coolant reattachment, expands the spanwise coolant coverage, and weakens the strength of the detrimental counter-rotating vortex pair (CRVP). For the unpulsed cooling, an uncooled gap region exists between the trailing edge of the hole and the onset of the coolant reattachment. The gap is offset when applying the pulsed cooling. Detailed vortical structures show the generation and evolvement of anti-CRVP and CRVP. The transportation of the separated wakes in the pulsed cooling is presented. It is observed that the strength of CRVP is weakened in the pulsing process. The interaction of the VGP introduced anti-CRVP and the separated coolant wakes is discussed.
机译：薄膜冷却是一种有效的方法，可以在高性能燃气轮机发动机中冷却叶片。使用大涡模拟研究了涡流和无脉冲膜冷却与涡流发生器对（VGP）进行研究。正弦冷却液脉动的稳定性数为0.25，无乳液冷却的吹出比为m = 1.0。时间平均和瞬时结果表明上游安装的VGP和动态脉冲效果都显着提高了冷却效果。 VGP的被动方法通过产生逆转器旋转的涡旋对（防CRVP）来增强冷却效果，该对加速冷却剂重新连接，展开枝条冷却剂覆盖，并削弱了有害的反向旋转涡流对（CRVP）的强度。对于未脉冲的冷却，存在在孔的后缘和冷却剂重新连接的初始缘之间存在未冷却间隙区域。施加脉冲冷却时，间隙偏移。详细的志性结构显示了抗CRVP和CRVP的产生和演变。提出了在脉冲冷却中分离的淋巴的运输。观察到CRVP的强度在脉冲过程中被削弱。讨论了VGP引入的抗CRVP和分离的冷却剂唤醒的相互作用。

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