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基于涡旋识别方法的高速列车尾涡结构的讨论

潘永琛 姚建伟 刘涛 李昌烽

潘永琛, 姚建伟, 刘涛, 李昌烽. 基于涡旋识别方法的高速列车尾涡结构的讨论[J]. 力学学报, 2018, 50(3): 667-676. doi: 10.6052/0459-1879-17-383
引用本文: 潘永琛, 姚建伟, 刘涛, 李昌烽. 基于涡旋识别方法的高速列车尾涡结构的讨论[J]. 力学学报, 2018, 50(3): 667-676. doi: 10.6052/0459-1879-17-383
Pan Yongchen, Yao Jianwei, Liu Tao, Li Changfeng. DISCUSSION ON THE WAKE VORTEX STRUCTURE OF A HIGH SPEED TRAIN BY VORTEX IDENTIFICATION METHODS[J]. Chinese Journal of Theoretical and Applied Mechanics, 2018, 50(3): 667-676. doi: 10.6052/0459-1879-17-383
Citation: Pan Yongchen, Yao Jianwei, Liu Tao, Li Changfeng. DISCUSSION ON THE WAKE VORTEX STRUCTURE OF A HIGH SPEED TRAIN BY VORTEX IDENTIFICATION METHODS[J]. Chinese Journal of Theoretical and Applied Mechanics, 2018, 50(3): 667-676. doi: 10.6052/0459-1879-17-383

基于涡旋识别方法的高速列车尾涡结构的讨论

doi: 10.6052/0459-1879-17-383
基金项目: 中国铁路总公司科技研究开发计划课题(2015T005-A),国家自然科学基金(11072091,51576092)和江苏省“青蓝工程”项目资助.
详细信息
    作者简介:

    通讯作者:李昌烽,教授,主要研究方向:复杂流体动力学、湍流减阻与流动控制. E-mail:cfli@ujs.edu.cn

    通讯作者:

    李昌烽

  • 中图分类号: O357.5+2,U266;

DISCUSSION ON THE WAKE VORTEX STRUCTURE OF A HIGH SPEED TRAIN BY VORTEX IDENTIFICATION METHODS

  • 摘要: 利用改进型延迟分离涡模拟方法对缩尺比例1:30的高速列车简化模型的绕流流场进行数值计算,主要针对近尾流区的涡旋结构展开具体讨论. 通过不同的涡旋识别方法,发现在尾涡结构中,高涡量的强涡旋主要聚集于尾车附近,而涡量较低但处于相对稳定状态的涡旋分布在大部分尾流空间中. 对此,主要基于最新提出的涡旋定义及其物理意义认为,由于边界层在尾部发生的流动分离,剪切变形以及高涡量的扩散对强涡旋的形成发挥着重要的作用,而涡旋会被较强的剪切旋转拉伸,使得局部复杂的流动表现出突出的湍流特性;另一方面,尽管涡强度明显下降,但是在强剪切应变迅速衰减的情况下,流向涡核中的涡旋涡量是主要的,此时,在较接近地面的情况下,流体微团以涡核为中心的旋转运动使得涡旋与地面之间的相互作用成为主导的流动机制. 虽然涡强度会相对缓慢地衰减,但是从湍流能量产生的角度,该机制对涡旋的自维持发挥重要的作用,从而使尾涡结构能够相对稳定地存在于尾流流动中.

     

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出版历程
  • 收稿日期:  2017-11-17
  • 刊出日期:  2018-05-18

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