发散冷却与冲击/发散冷却的冷却效率对比

杨谦; 林宇震; 张弛; 许全宏

doi:10.13224/j.cnki.jasp.2014.02.004

发散冷却与冲击/发散冷却的冷却效率对比

doi: 10.13224/j.cnki.jasp.2014.02.004

北京航空航天大学能源与动力工程学院航空发动机气动热力国家级重点实验室, 北京 100191

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出版历程
- 收稿日期: 2012-12-28
- 刊出日期: 2014-02-28

Cooling effectiveness comparison between effusion cooling and impingement/effusion cooling

National Key Laboratory of Science and Technology on Aero-Engine Aero-thermodynamics, School of Energy and Power Engineering, Beijing University of Aeronautics and Astronautics, Beijing 100191, China

摘要

摘要: 为了得到最佳的冷却结构，在相同冷却气量下对发散孔单层壁与冲击/发散孔双层壁冷却结构的冷却效率进行了试验研究.试验保证相同的发散孔排布规律、热侧与冷侧进气温度、冷却气量、热气量以及热冷侧之间的空气压降，使用红外热像仪对发散孔壁的热侧壁面温度进行测量以得到冷却效率，并对两种结构的冷却效率进行对比分析.试验结果表明：在相同冷却开孔面积、相同冷热气条件下，冲击/发散孔双层壁的冷却效率要比发散孔单层壁大约高30%，这归因于冲击/发散冷却方式存在更高的换热强化能力.
- 发散孔 /
- 冲击/发散孔 /
- 单层壁 /
- 双层壁 /
- 冷却效率
Abstract: In order to acquire the optimal cooling approach of aero-engine chamber,experimental approaches were taken to study the cooling effectiveness of effusion cooling and impingement/effusion cooling.Cooling effectiveness of these two types of cooling configurations were investigated on the same hot/cold air conditions of inlet,such as position of effusion holes,inlet temperature of hot/cool side,mass flow of hot/cool air,pressure drop between hot/cool sides.Infrared camera was used to measure the temperature of effusion cooled surfaces on the side of hot main stream to get the cooling effectiveness,and analyzed the cooling effectiveness of these two cooling configurations.The results show that on the condition of the same opening area and hot/cold air conditions of inlet,double wall cooling gets higher cooling effectiveness than effusion cooling configurations by approximately 30%, owing to the heat transfer enhancement within the gap of the double walls.
- effusion holes /
- impingement/effusion holes /
- single wall /
- double walls /
- cooling effectiveness

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