| 自激励旋进射流冲击冷却的对流换热特性 |
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| 引用本文： | 周静伟,耿丽萍,王玉刚.自激励旋进射流冲击冷却的对流换热特性[J].航空动力学报,2009,24(6):1197-1203. |
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| 作者姓名： | 周静伟 耿丽萍 王玉刚 |
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| 作者单位： | 中国计量学院,计量测试工程学院,杭州,310018 |
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| 基金项目： | 国家自然科学基金(50676088);;浙江省自然科学基金(Y105679);;浙江省钱江人才计划(2007R10030) |
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| 摘 要： | 对自激励旋进射流冲击冷却的对流换热特性进行了实验研究.通过对旋进射流出口速度进行频谱分析研究其流动特性,结果表明旋进频率显著地受喷嘴尺寸影响,而Strouhal准则数则受喷嘴尺寸和流量的影响都很小.冲击传热实验表明,由于旋进射流对周围流体的卷吸作用使得射流流速显著下降,强化换热效果反而不及普通的冲击射流,而且随喷嘴尺寸的变化,旋进射流与直射射流之间换热性能的差异也没有统一的变化趋势.旋进射流只有在水平外掠加热平板时,才可能获得比普通射流更高的对流换热系数.
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| 关 键 词： | 对流换热特性 自激励旋进射流 冲击冷却 旋进频率 喷嘴尺寸 |
| 收稿时间： | 2008/6/12 0:00:00 |
| 修稿时间： | 2008/11/7 0:00:00 |
Convective heat transfer characteristics of impingement cooling for a self-excited precessing jet |
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| ZHOU Jing-wei,GENG Li-ping and WANG Yu-gang.Convective heat transfer characteristics of impingement cooling for a self-excited precessing jet[J].Journal of Aerospace Power,2009,24(6):1197-1203. |
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| Authors: | ZHOU Jing-wei GENG Li-ping and WANG Yu-gang |
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| Institution: | College of Metrology and Measurement Engineering;China Jiliang University;Hangzhou 310018;China |
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| Abstract: | Heat transfer performance under precessing jet impingement cooling was experimentally studied.The flow characteristic of the self-excited precessing jet was firstly investigated by a frequency spectra analysis to the jet velocity obtained at the nozzle exit.It was demonstrated that the precessing frequency of the jet was greatly influenced by the nozzle diameter while the Strouhal number was only slightly influenced by the nozzle diameter and the flow rate.The heat transfer experiments indicate that,because... |
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| Keywords: | convective heat transfer characteristics self-excited precessing jet impingement cooling precessing frequency nozzle size |
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