LI Guangchao, ZHANG Zhandong, ZHANG Wei, et al. Numerical simulation on cooling effectiveness of gas film on tip of blade with groove and fins[J]. Thermal power generation, 2016, 45(10): 23-28.
LI Guangchao, ZHANG Zhandong, ZHANG Wei, et al. Numerical simulation on cooling effectiveness of gas film on tip of blade with groove and fins[J]. Thermal power generation, 2016, 45(10): 23-28.DOI:
凹槽带肋叶顶气膜冷却特性数值模拟
摘要
为了提高凹槽叶顶的气膜冷却效率
提出了一种凹槽带肋叶顶结构。通过数值模拟方法
研究了叶顶结构在不同吹风比、滑移壁面条件下冷却气体在凹槽腔内的流动状态和气膜冷却效率分布
揭示了凹槽带肋叶顶改善叶顶气膜冷却效率机理。结果表明:吹风比为0.5时
气膜孔附近冷却效率最高;吹风比为1.5时
凹槽内吸力面附近冷却效率最高;肋片导流作用使冷气更大范围地覆盖在凹槽内
提高了平均冷却效率
这种效应在吹风比为0.5时更明显。
Abstract
To enhance the cooling effectiveness of gas film on top of groove blade
a structure of groove blade with fins was proposed.The flow status and gas film cooling effectiveness distribution of cooling gas inside the groove were numerically simulated
under conditions with different blowing ratios and end wall slippage situations.The cooling effectiveness enhancement mechanism of the fins structure was revealed.The results show that
the highest cooling effectiveness appears near the film hole and the suction side at blowing ratio of 0.5and 1.5
respectively.The flow guidance effect the fins improves the film coverage
resulting in an increase in the average film cooling effectiveness on the squealer tip