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首页> 外文期刊>Experimental Thermal and Fluid Science: International Journal of Experimental Heat Transfer, Thermodynamics, and Fluid Mechanics >Experimental investigation of the grid-generated turbulence features in a free surface flow
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Experimental investigation of the grid-generated turbulence features in a free surface flow

机译：自由表面流中网格产生的湍流特征的实验研究

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The present study aims to investigate the features of a grid-generated turbulence occurring in a current flow with a free surface flow. The interest is focused on the length and time scales of the turbulence. These are the macro, the micro and the Kolmogorov scales. To analyze the flow, a 2D LDV system has been used to measure (U) over bar, (W) over bar, u' and w'. This non-intrusive and optical technique is really accurate (in terms of space and time resolution). Furthermore, it does not disturb the flow and provides a high data rate. Both horizontal and vertical velocities are recorded at the same time according to a coincidence window (tau(cw)). Bias measurements are avoided by using a filtering technique during data processing. The improved homogeneity and isotropy of the turbulence downstream of the grid allows the use of the Taylor hypothesis. Thus, all length and time scales of the flow can be estimated. Results are discussed as well as the influence of the upcoming mean velocity ((U) over bar) on the turbulence properties. (c) 2005 Elsevier Inc. All rights reserved.
机译：本研究旨在研究在具有自由表面流的电流中发生的网格生成湍流的特征。兴趣集中在湍流的长度和时间尺度上。这些是宏观，微观和柯尔莫哥洛夫尺度。为了分析流量，已使用2D LDV系统测量棒上的（U），棒上的（W），u'和w'。这种非侵入式光学技术非常准确（就空间和时间分辨率而言）。此外，它不会干扰流程并提供高数据速率。根据重合窗口（tau（cw））同时记录水平和垂直速度。通过在数据处理过程中使用过滤技术来避免偏差测量。网格下游湍流的均匀性和各向同性的改善允许使用泰勒假设。因此，可以估计流的所有长度和时间尺度。讨论了结果以及即将到来的平均速度（（U）over bar）对湍流特性的影响。 （c）2005 Elsevier Inc.保留所有权利。

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