凹槽带肋叶顶气膜冷却特性数值模拟

发布时间：2018-01-13 09:02

本文关键词：凹槽带肋叶顶气膜冷却特性数值模拟　出处：《热力发电》2016年10期 　论文类型：期刊论文

【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]:In order to improve the film cooling efficiency of the top of the grooved blade, a groove with rib blade top structure was proposed, and the blade top structure in different blowing ratio was studied by numerical simulation. The flow state of cooling gas and the distribution of film cooling efficiency in the grooved cavity under sliding wall conditions reveal the mechanism of improving the cooling efficiency at the top of the vane with ribbed blade top. The results show that the ratio of blowing air to air is 0.5. The cooling efficiency near the film hole is the highest; When the blowing ratio is 1.5, the cooling efficiency is the highest near the suction surface in the groove. The effect of ribbed flow on the air conditioning covers the groove in a wider range and improves the average cooling efficiency. This effect is more obvious when the blowing ratio is 0.5.
【作者单位】：沈阳航空航天大学辽宁省航空推进系统先进测试技术重点实验室;
【基金】：国家自然科学基金项目(51306126,51406124) 辽宁省自然科学基金项目(2015020112)
【分类号】：TK471
【正文快照】： 为了提高燃气轮机循环热效率,涡轮进口温度不断提高,涡轮所承受的热负荷不断增大[1],叶顶由于受到泄漏流作用,属于容易被热腐蚀的部位之一,因此,必须采取合理的方法降低涡轮叶顶工作温度。降低叶顶热负荷主要采取改进叶顶结构和先进的冷却技术2种措施。Chyu等人[2]提出了凹槽

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