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On the bursting condition for transitional separation bubbles

机译：关于过渡分离气泡的破裂条件

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摘要

The reattachment region in a transitional, separated boundary layer has been experimentally investigated using non-intrusive, laser based flow diagnostics. The separated flow is generated over a flat plate that is subject to an externally imposed adverse pressure gradient. After boundary layer separation, the resulting shear layer undergoes transition and it may reattach to form a closed recirculation bubble. Particle Image Velocimetry measurements are used to obtain a detailed description of the separated flow region. Subcritical and supercritical reattachment regimes, respectively characterized by short and long recirculation bubbles, are found to depend on the Reynolds number based on the maximum edge velocity and on the pressure gradient characteristic length. Previously reported criteria are explored to describe the value of the critical Reynolds number limiting the two flow configurations. Detailed measurements are conducted to describe phenomenological differences between the two flow regimes. Based on these descriptions, a simplified model is proposed to estimate the critical Reynolds number, showing that it is able to provide appropriate scaling of this parameter. (C) 2014 Elsevier Masson SAS. All rights reserved.
机译：已经使用非侵入式，基于激光的流量诊断程序对过渡分离的边界层中的重新连接区域进行了实验研究。分离的流在平板上产生，该平板受到外部施加的不利压力梯度的影响。在边界层分离之后，所得的剪切层经历转变，并且它可以重新附着以形成闭合的再循环气泡。粒子图像测速仪测量用于获得分离流动区域的详细说明。发现分别以短和长的再循环气泡为特征的亚临界和超临界再附着方式取决于基于最大边缘速度和压力梯度特征长度的雷诺数。探索先前报道的标准来描述限制两种流动配置的临界雷诺数的值。进行详细的测量以描述两种流动方式之间的现象学差异。基于这些描述，提出了一种简化模型来估计临界雷诺数，表明该模型能够提供此参数的适当缩放比例。 （C）2014 Elsevier Masson SAS。版权所有。

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  • 来源
    《Aerospace science and technology》 |2015年第julaaauga期|43-50|共8页
  • 作者

    Serna J.; Lazaro B. J.;

  • 作者单位

    Univ Politecn Madrid, Sch Aeronaut, E-28040 Madrid, Spain|Univ Ctr Def, MDE UPCT, Spanish Air Force Acad, Murcia 30720, Spain;

    Univ Politecn Madrid, Sch Aeronaut, E-28040 Madrid, Spain;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Separation bubble; Boundary layer; Bursting; Reattachment;

    机译：分离气泡;边界层;破裂;重新附着;

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