通过传热-传质类比法研究了湍流度对单排圆柱孔及后扩孔气膜冷却效率的影响.计算结果表明,小吹风比M=0.5时,圆柱孔与后扩孔的壁面冷却效率相当,湍流度趋向于在整个下游区域使冷却效果恶化;大吹风比M=2时,后扩孔产生的壁面气膜冷却效率的提高明显,而湍流度的提高强化了冷却剂向壁面的扩散,削弱了冷却气膜脱离壁面的现象,趋向于在整个下游区域提升冷却效率.
The influence of turbulence intensity on film cooling in a cylindrical hole and back-diffused hole was studied numerically with heat/mass transfer analogy.At low blowing ratio M=0.5,the cooling effectiveness in cylindrical hole and back-diffused hole were similar and the cooling performances were deteriorated with an increase of turbulence intensity.At high blowing ratio M=2.0.a dramatic increase in cooling effectiveness in a back-diffused hole was observed when compared to the cylindrical hole.Meanwhile,cooling effectiveness was elevated with increase in turbulence intensity in the entire downstream region because of the enhancement of coolant spreading over the wall as well as suppression of cooling stream detachment.
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