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Experimental Study on Wake Development in a Three-cylinder Model within a Tunnel in Transitional Flow

机译:过渡流隧道内三缸模型尾迹发展的实验研究

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摘要

The characteristics of the flow and heat transfer in transitional flow are not clear and especially the lack of some reliable experimental data hinders the numerical study of the heat exchanger. Based on this, a two-dimensional time-resolved digital particle image velocimetry from the American-TSI-corporation was adopted. Experiments were carried out in an open-loop, recirculating water tunnel that operated at steady-state conditions. The experimental object is a three-cylinder with an equilateral triangle configuration having center-to-center distance ratio of 3. Reynolds number based on the tube diameter and the velocity of inlet is set at 70, 90, 120, 150, 200, 250 and 300. The flow parameters were quantified to research the effect of Reynolds number on flow field for supporting some facts to analyze the heat transfer. Time-mean flow field, turbulence statistics and velocity processed by proper orthogonal decomposition were investigated at different Reynolds numbers. The wake closure length, oscillation and Karman vortex in the wake of the three-cylinder model were discussed in detail.
机译:过渡流中的流动和传热特性不清楚,尤其是缺乏可靠的实验数据阻碍了热交换器的数值研究。在此基础上,采用了美国TSI公司的二维时间分辨数字粒子图像测速仪。实验在稳态条件下运行的开环循环水隧道中进行。实验对象是具有等边三角形构型的三缸,中心距比为3。基于管径和入口速度的雷诺数设置为70、90、120、150、200、250和300。对流动参数进行了定量研究,以研究雷诺数对流场的影响,以支持一些事实来分析传热。研究了在不同雷诺数下的时均流场,湍流统计和通过适当的正交分解处理的速度。详细讨论了三缸模型尾流中的尾流闭合长度,振荡和卡尔曼涡旋。

著录项

  • 来源
    《Heat Transfer Engineering》 |2018年第20期|1507-1519|共13页
  • 作者

  • 作者单位

    Shanghai Jiao Tong Univ Sch Mech & Power Engn Shanghai Peoples R China;

    Nantong Univ Sch Mech Engn Nantong Peoples R China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
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