| 摘要: |
| 对９种不同几何尺寸的冲击孔板及其换热靶板，在冷流压力损失控制在１０％以下时，测量其换热的平均努氏数，并依据结果分析冲击换热的影响和影响程度，最后采用多元线性回归法，将结果数据整理成换热的准则关系式。实验结果表明：（１）冲击换热的平均努氏数Ｎｕｄ随冲击孔的雷诺数Ｒｅｄ的增加呈上升趋势，（２）冲击换热的平均努氏数Ｎｕｄ在冲击间距Ｚｎ＝０．８ｍｍ～４．８ｍｍ内，随Ｘｎ／ｄ的增加呈下降趋势，（３）冲击间距Ｚｎ＝０．８ｍｍ～４．８ｍｍ内，冲击换热随冲击间距与冲击孔孔径之比Ｚｎ／ｄ增加而微弱上升，（４）在实验范围内冲击换热的平均努氏数可用下式表示：Ｎｕｄ＝０．２８１（Ｚｎ／ｄ）０．０７１（Ｘｎ／ｄ）－１．２９Ｒｅ０．７６ｄ，式中１５００≤Ｒｅｄ≤１００００，６．２５≤Ｘｎ／ｄ≤８．３３，０．５３≤Ｚｎ／ｄ≤３．００。 |
| 关键词: 燃烧室 空气冷却 热传导试验 |
| DOI： |
| 分类号: |
| 基金项目: |
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| THE EXPERIMENTAL INVESTIGATION OF IMPINGING COOLING IN THE COMBUSTION CHAMBER |
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Gao Chao, Chu Xiaorong, Wang Baoguan
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Dept of Power Engineering,Nanjing Univ.of Aeronautics and Astronautics,Nanjing,210016
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| Abstract: |
| The experimental study of heat transfer by a multiple square array of round air jets impinging perpendicular to a flat plate is presented.The aim of the study is to simulate a combustor wall cooling construction for future advanced jet engine.In the procedure of the investigations,nine different impingement plates and seven relevant target plats were studied.The average Nusselt numbers were measured with nine different Reynold′s number and six different impinging gaps.The influence of the hole′s Reynold numbers and the geometry of impingement plates on the impinging heat transfer were analysised.The multivariate linear regression method was used in data processing,and a general correlation was obtained. |
| Key words: Combustion chamber Air cooling Heat transfer test |
