INFLUENCE OF FILM COOLING HOLES PARTIAL BLOCKAGE ON COOLING EFFECTIVENESS

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外文摘要：To study the effect of blockage on the film cooling performance， film cooling plate models with cylindrical hole， compound hole， and fan-shaped hole under the all-round blockage， leading-edge blockage， and trailing-edge blockage were established respectively。 The anti-blockage performance of three kinds of the hole was compared。 The result shows that the cooling performance of cylindrical holes is the worst due to the appearance of counter-rotating vortex pair (CRVP) under blockage。 The cooling effectiveness decreases with the increase of the blockage ratio。 With the re-attachment effect， the cooling effectiveness of downstream increases by 11% on the contrary。 The cooling effectiveness of the compound hole decreases obviously with the all-round and trailing-edge blockages， meanwhile， the peak cooling effectiveness and the coolant coverage area decrease。 However， the cooling effectiveness increases by 15% when the leading-edge is blocked。 For fan- shaped hole， the change of velocity gradient affects the development of the anti-CRVP， which disappears under the all- round blockage and reduces the cooling effectiveness greatly。 The change of cooling performance of leading-edge and trailing- edge is very slight no more than 5%。 In conclusion， the fan- shaped hole shows the best anti-blockage capability under the trailing-edge blockage condition and the all-round blockage condition with a high blow ratio， while the compound hole performs better in other conditions。

外文关键词：

Film coolingBlow ratioCooling efficiencyBlockageAnti-blockage performance

作者：

Junhong ZHANG、Wenxin DONG、Jiewei LIN、Huwei DAI、Xibo WANG

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作者单位：

State Key Laboratory of Engines, Tianjin University, Tianjin, 300354, China,Mechanical Engineering Department of Tianjin Ren'Ai College, Tianjin, 301636, China

State Key Laboratory of Engines, Tianjin University, Tianjin, 300354, China

会议名称：

International Mechanical Engineering Congress and Exposition

会议母体文献：

Proceedings of the ASME International Mechanical Engineering Congress and Exposition 2021

页码：

V011T11A007.1-V011T11A007.12

出版时间：

2021