冲击/发散冷却壁温分布和冷却效率研究

胡超; 许全宏; 徐剑; 林宇震

冲击/发散冷却壁温分布和冷却效率研究

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防科技重点实验室, 北京 100191

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出版历程
- 收稿日期: 2007-09-20
- 修回日期: 2007-11-26
- 刊出日期: 2008-10-28

Investigation of the wall temperature distribution and cooling efficiency for impingement/effusion cooling scheme

National Key Laboratory on Aero-Engines, School of Jet Propulsion, Beijing University of Aeronautics and Astronautics, Beijing 100191, China

摘要

摘要: 针对高温升燃烧室长寿命火焰筒的要求,实验研究了孔排列方式、发散壁壁厚与孔径之比以及单位面积开孔率对壁温分布和冷却效率的影响.实验中冷却气为常温常压,主流速度20m/s,发散壁孔内气流与主流速度比为0.63,主流与冷却气温度比为1.6.实验结果表明:长菱形排布与正菱形排布相比冷却效率更高,但孔的排布方式对于壁温分布的影响较小;增大发散壁壁厚与孔径比可以增强冷却效果,并使壁温分布变得均匀;而减小单位面积开孔率对于壁温分布的影响较小,同时冷却效率也会降低.
- 壁温分布 /
- 冷却效率 /
- 燃烧室 /
- 冲击/发散 /
- 火焰筒
Abstract: In order to meet long-duration requirements of high-temperature combustor liner,impingement/ effusion cooling scheme was investigated experimentally in the following aspects: the influence of the hole arrangements,the ratio of the wall thickness to the hole diameter,and the opening rate per unit area on the overall cooling effectiveness and wall temperature distribution.The condition of cooling air was under atmospheric temperature and pressure.The velocity of the main flow was 20 m/s.The velocity ratio of the cooling air to the main flow was 0.63,and the temperature ratio of the main flow to the cooling air was 1.6.The experimental results indicate that it has a better performance in the cooling efficiency with the long rhombus hole arrangement,while little influence on wall temperature distribution,and reducing the opening rate per unit area has the same result.The wall temperature distribution becomes more uniform when the ratio of the wall thickness to the hole diameter increases,and the cooling efficiency will decrease at the same time.
- wall temperature distribution /
- cooling efficiency /
- combustor /
- impingement/effusion /
- liner

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参考文献(12)

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