利用横向槽改善气膜冷却效率的实验
Experiments on improving film cooling effectiveness with transverse slots
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摘要: 为了获得横向槽对气膜冷却效率的影响规律,分别对气膜孔出口全开槽、上游开槽和不开槽三种气膜冷却结构形式的平板实验模型进行了实验研究,获得了带横向槽气膜冷却结构的冷却效率随吹风比的变化规律和开槽形式对冷却效率的影响规律,以揭示横向槽改善气膜冷却效率的机理.研究表明:在横向槽的作用下,冷却射流向主流的垂直扩散受到抑制,二次流在流出横向槽后能更好的贴覆绝热壁面,提高了气膜冷却效率,并且在气膜孔出口处开槽,对提高气膜孔下游的平均冷却效率有较大的作用,上游开槽结构的下游平均冷却效率高于全开槽和不开槽结构的平均冷却效率.Abstract: To investigate the influence of transverse slots on film cooling effectiveness,an experimental study was employed with three different film cooling experimental plates in several ratios,two of which have different transverse slots.And the distributions were compared with the baseline holes' to reveal the good effects of the transverse slots on the film cooling performance.The results show that,the penetration of the film secondary flow into the cross flow is suppressed under the action of the transverse slots,so the film effectiveness is higher with better coverage on the hot side.And SCASE 2 of sloped downstream slot outperforms the other cases with respect to the cooling effectiveness.
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Key words:
- film cooling /
- transverse slots /
- flow and heat transfer /
- cooling effectiveness
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