| 横流对冲击射流换热特性的影响 |
| |
| 引用本文： | 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[J].航空动力学报,2011,26(8):1768-1774. |
| |
| 作者姓名： | 张传杰 孙纪宁 李浩 毛宏霞 |
| |
| 作者单位： | 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 |
| |
| 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) |
| |
| 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Nuav,is随横流的增大而增大;②冲击靶面前区努塞尔数Nufia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Nubia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.
|
| 关 键 词： | 横流 对流换热 冲击射流 拉伸涡 马蹄涡 |
| 收稿时间： | 9/1/2010 12:00:00 AM |
| 修稿时间： | 2011/1/14 0:00:00 |
Investigation on heat transfer mechanism of impinging jet with cross-flow |
| |
| ZHANG Chuan-jie,SUN Ji-ning,LI Hao and MAO Hong-xia.Investigation on heat transfer mechanism of impinging jet with cross-flow[J].Journal of Aerospace Power,2011,26(8):1768-1774. |
| |
| Authors: | ZHANG Chuan-jie SUN Ji-ning LI Hao and MAO Hong-xia |
| |
| Institution: | 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,China2.Beijing Institute of Environmental Features, China Aerospace Science and Industry Corporation,Beijing 100854,China |
| |
| 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. |
| |
| Keywords: | cross-flow convection transfer impinging jet stretching vortex horseshoe vortex |
| 本文献已被 CNKI 万方数据 等数据库收录！ |
| 点击此处可从《航空动力学报》浏览原始摘要信息 |
| 点击此处可从《航空动力学报》下载免费的PDF全文 |
|
