| 细长旋成体大迎角绕流非定常特性的实验研究 |
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| 引用本文： | 刘沛清,常春雷,马宇.细长旋成体大迎角绕流非定常特性的实验研究[J].实验流体力学,2006,20(3):23-28. |
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| 作者姓名： | 刘沛清 常春雷 马宇 |
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| 作者单位： | 北京航空航天大学流体力学教育部重点实验室,北京,100083 |
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| 摘 要： | 在亚临界流动范围内,通过细长旋成体在无侧滑状态下的脉动压力测量,对大迎角细长旋成体多涡区域的轴向以及周向的压力脉动特性进行了研究,分析了旋成体周向压力脉动幅度及主频与背涡之间的对应关系,发现在多涡区存在一种完全不同于卡门涡脱落时的非定常现象,得到压力脉动主频的斯特劳哈数沿旋成体轴向有逐渐增大的趋势。
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| 关 键 词： | 旋成体 多涡 压力脉动 主频 |
| 文章编号： | 1672-9897（2006）03-0023-06 |
| 收稿时间： | 2005-10-18 |
| 修稿时间： | 2006-03-15 |
Experimental study of non-stationarity in the flow over slender body at high angles of attack |
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| LIU Pei-qing,CHANG Chun-lei,MA Yu.Experimental study of non-stationarity in the flow over slender body at high angles of attack[J].Experiments and Measur in Fluid Mechanics,2006,20(3):23-28. |
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| Authors: | LIU Pei-qing CHANG Chun-lei MA Yu |
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| Institution: | Key laboratory of Fluid Mechanics of the Ministry of National Education, Beijing. University of Aeronautics and Astronautics, Beijing 100083, China |
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| Abstract: | In order to study the pressure fluctuation characteristics along the axis and cross-section of the flow over slender body in multi-vortices area at high angels of attack and zero slip,an experiment of pressure measurement has been carried out in subcritical Re number range.The corresponding relationship between the pressure fluctuation magnitude of cross-section and the primary frequency and the vortices on the back of the slender cylinder has been analyzed.There is an unsteady phenomena which different completely from Karman vortex shedding in multi-vortices area.It can be found that the tendency of St number of predominant frequency of pressure fluctuating increases along the slender cylinder axis. |
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| Keywords: | body of revolution multi-vortices pressure fluctuation predominant frequency |
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