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A DNS Study on the Effects of Streamwise Convex Surface Curvature on Coherent Structures in Turbulent Boundary Layers.

机译:对湍流边界层中相干结构的流向凸曲面曲率影响的DNS研究。

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摘要

Direct numerical simulation results are used to establish the effect of streamwise convex surface curvature on the development of turbulent boundary layers, and the effect of such curvature on the forced-convection heat transfer variations observed at certain supercritical thermodynamic states. The results illustrate the stabilizing effects of this flow geometry through modification of the structure and distribution of hairpin-like vortical flow structures in the boundary layer. Specifically, the radial equilibrium mechanism existing on the streamwise convex surface acts to decrease the streamwise spacing of hairpin-like structures within a wave packet and increase the spanwise spacing of the hairpin-like structures in comparison to the behaviour of such structures within the boundary layer on a flat surface. Furthermore, enhancement of convective heat transfer realized at a particular heat flux-to-mass flux ratio with the working fluid at a supercritical thermodynamic state is observed to be reduced by the stabilizing effect of convex surface curvature.
机译:直接数值模拟结果用于建立沿流凸面曲率对湍流边界层发展的影响,以及这种曲率对在某些超临界热力学状态下观察到的对流换热变化的影响。结果表明,通过改变边界层中发夹状涡流结构的结构和分布,可以稳定这种流动几何形状。具体地,与边界层内的此类结构的行为相比,存在于流向凸面上的径向平衡机制用于减小波包内的发夹状结构的流向间距并增加发夹状结构的展向间距。在平坦的表面上。此外,观察到通过凸表面曲率的稳定作用,在工作流体处于超临界热力学状态下以特定的热通量与质量通量比实现的对流换热的增强被减小。

著录项

  • 作者

    Dave, Nikunj.;

  • 作者单位

    Carleton University (Canada).;

  • 授予单位 Carleton University (Canada).;
  • 学科 Engineering Aerospace.;Engineering Nuclear.;Engineering Mechanical.
  • 学位 M.A.Sc.
  • 年度 2012
  • 页码 134 p.
  • 总页数 134
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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