| 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].气动实验与测量控制,2009(2):31-35. |
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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（50606024）;NSFC-KOSEF基金（50711140398）资助项目 |
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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 TR—PIV 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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| Authors: | WAN Jin-jin SHI Liu-liu YU Jun LIU Ying-zheng |
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| Institution: | (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 velocity 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 turbulent flow was revealed in terms of spectral analysis. The vortex shedding and development processes were described using the instantaneous velocity fields. |
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| Keywords: | square cylinder TR-PIV separated flow reattaching turbulent flow coherent structure correlation analysis |
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