| 贴壁方柱湍流场TR-PIV实验研究 |
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| 引用本文： | 万津津,施鎏鎏,余俊,刘应征.贴壁方柱湍流场TR-PIV实验研究[J].实验流体力学,2009,23(2). |
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| 作者姓名： | 万津津 施鎏鎏 余俊 刘应征 |
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| 作者单位： | 上海交通大学动力机械与工程教育部重点实验室,上海,200240 |
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| 基金项目： | 国家自然科学基金，NSFC-KOSEF基金 |
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| 摘 要： | 采用时变粒子图像速度场测试技术(TR-PIV),对低速循环水槽中贴壁二维方柱绕流湍流场进行了细致的测量.通过对实验得到的30000个连续瞬态速度场进行分析,得到了时均速度场和流线图谱,以及流向、法向速度分量的脉动强度场和涡量场.此外,对脉动速度时序信号进行谱分析,得到了流场中低频大尺度相干结构脱落频率.通过对瞬态速度场的分析,揭示了贴壁方柱绕流的旋涡脱落及其发展过程.
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| 关 键 词： | 方柱 分离流 再附湍流 相干结构 相关分析 |
TR-PIV measurement of the flow past a square cylinder flush-mounted on the wall |
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| WAN Jin-jin,SHI Liu-liu,YU Jun,LIU Ying-zheng.TR-PIV measurement of the flow past a square cylinder flush-mounted on the wall[J].Experiments and Measur in Fluid Mechanics,2009,23(2). |
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| Authors: | WAN Jin-jin SHI Liu-liu YU Jun LIU Ying-zheng |
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| Affiliation: | Power Machinery and Engineering Lab;Shanghai Jiao Tong University;Shanghai 200240;China |
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| Abstract: | The turbulent flow past a two-dimensional square cylinder flush-mounted on a plane wall was extensively measured by time-resolved particle image velocimetry(TR-PIV).Toward this end,a low-speed recirculation water channel was established.Characteristics of the flow were statistically analyzed on 30,000 consecutive veloeity maps in terms of time-averaged streamline pattern,velocity field,turbulence intensity and vorticity distributions.Existence of low-frequency coherent vortical structure embedded in the tur... |
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| Keywords: | TR-PIV |
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