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首页> 外文期刊>International Journal of Heat and Mass Transfer >Conjugate heat transfer analysis of leading edge and downstream mist-air film cooling on turbine vane
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Conjugate heat transfer analysis of leading edge and downstream mist-air film cooling on turbine vane

机译：涡轮叶片前缘和下游雾气膜冷却的共轭传热分析

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摘要

Numerical simulations are performed to explore leading edge and downstream film cooling enhancement by application of injecting water mist into the air. The accuracy of numerical simulation program for conjugate heat transfer methodology is verified with the C3X gas turbine vane cooled with leading edge and downstream film holes. The Eulerian-Lagrangian particle tracking method is adopted to investigate the two phase film cooling. The effects of various parameters including mist concentration, mist diameter and mist injection location on the improvement of cooling performance are investigated in this paper. The results show that the average wall temperature reduction at mid span increases from 20 K to 48 K from 1% to 3% mist ratio, the corresponding average heat transfer coefficient reduction increases from 77W m~(-2)K~(-1) to 103W m~(-2)K~(-1). Mist cooling can decrease the boundary layer temperature without impact on the mainstream temperature and boundary layer thickness. The degree and the location of cooling performance can be controlled by manipulating the sizes of injected water mist. The superimpo-sition of different mist injection locations can be used to further strengthen the two phase cooling performance.
机译：通过向空气中注入水雾进行数值模拟，以探索前沿和下游薄膜冷却的增强。用前缘和下游薄膜孔冷却的C3X燃气轮机叶片验证了共轭传热方法数值模拟程序的准确性。采用欧拉-拉格朗日粒子跟踪方法研究了两相膜的冷却过程。研究了雾浓度，雾直径和雾注入位置等参数对改善冷却性能的影响。结果表明，中跨平均壁温降低从20 K增加到48 K，从1％到3％雾化比，相应的平均传热系数降低从77W m〜（-2）K〜（-1）增加至103W m〜（-2）K〜（-1）雾冷却可以降低边界层温度，而不会影响主流温度和边界层厚度。冷却性能的程度和位置可以通过控制注入的水雾的大小来控制。可以使用不同雾喷射位置的超定位来进一步增强两相冷却性能。

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