横流对冲击射流换热特性的影响

张传杰; 孙纪宁; 李浩; 毛宏霞

横流对冲击射流换热特性的影响

1.
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
2.
中国航天科工集团公司北京环境特性研究所,北京 100854

基金项目: “凡舟”青年科研基金(20080402); 中央高校基本科研业务费专项资金(YWF-10-02-043)

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出版历程
- 收稿日期: 2010-09-01
- 修回日期: 2011-01-14
- 刊出日期: 2011-08-28

Investigation on heat transfer mechanism of impinging jet with cross-flow

1.
National Key Laboratory of Science and Technology on Aero-Engine Aero-thermodynamics, School of Jet Propulsion, Beijing University of Aeronautics and Astronautics, Beijing 100191,China
2.
Beijing Institute of Environmental Features, China Aerospace Science and Industry Corporation,Beijing 100854,China

摘要

摘要: 用实验和数值计算的方法研究了横流对单孔短距冲击换热特性的影响规律.结果表明:①在实验研究范围内,冲击靶面平均努塞尔数Nu_av,is随横流的增大而增大;②冲击靶面前区努塞尔数Nu_fia随横流的增大而减小,这是因为壁面附近x负向流动的气流流速绝对值变小,换热削弱;③靶面冲击点附近及冲击靶面后区努塞尔数Nu_bia随横流的增大而增大,原因是在冲击点上游出现的马蹄涡的旋涡方向和冲击射流自身形成的卷吸涡拉伸涡对方向相同,这两种涡的叠加使该区域冲击靶面的换热得到增强.
- 横流 /
- 对流换热 /
- 冲击射流 /
- 拉伸涡 /
- 马蹄涡
Abstract: Experimental and numerical investigations were made to simulate heat transfer characteristics of a single impinging hole and short impinging distance with cross-flow. The results show that:(1)in the experiment, the average Nusselt number of the impingement surface increases with the increase of cross-flow; (2)the Nusselt number in the front impact area decreases with the increase of cross-flow, because the flow velocity near the wall decreases, weakening the heat transfer effect; (3)the Nusselt number behind impact area near the impact point increases with the increase of cross-flow, because the vortexes directions between the horseshoe vortex in the upstream near the impact point and the stretching vortex produced by impinging jet are the same, and these two vortexes enhance the heat transfer in the impact surface.
- cross-flow /
- convection transfer /
- impinging jet /
- stretching vortex /
- horseshoe vortex

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参考文献(12)

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