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Experimental Investigation of Roughness Effects on Transition on Blunt Spherical Capsule Shapes

机译：粗糙度对钝球形胶囊形状转变的影响的实验研究

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摘要

Boundary-layer transition plays an important role in aerodynamic heating of blunt capsule shapes. Transition may occur from disturbances created by surface roughness and fluctuations of the freestream. The present paper reports on a number of related experiments on Apollo-type capsule models in a range of hypersonic wind tunnels. The Adjustable Contour Expansion facility of the Texas A&M University provided Mach 6 experiments with distributed roughness at relatively low Reynolds numbers, 2.5E5 Re-d 5E5, with d denoting the capsule diameter. Observed boundary-layer transition data align well with current estimates of transient growth theory. Larger Reynolds numbers, 1E6 Re-d 3E6, could be assessed in the hypersonic Ludwieg tube Braunschweig of the Braunschweig University of Technology in Germany. Distributed roughness height values were broadly varied during these experiments, and different fluctuation levels of the freestream were considered. The results indicate roughness-induced transition for larger roughness heights, in accordance with correlations based on transient growth theory, and transition due to freestream disturbances, at subcritical roughness. Effects of total flow enthalpy on transition with isolated roughness were investigated in the High Enthalpy Shock Tunnel facility of the Japan Aerospace Exploration Agency. Here, roughness height, Reynolds number, and flow total enthalpy were varied. The paper reviews the most important results of these experiments and provides analysis, taking into account transient growth theory and numerical simulation data.
机译：边界层过渡在钝胶囊形状的空气动力学加热中起重要作用。过渡可能是由于表面粗糙度和自由流的波动所产生的干扰而发生的。本文报道了一系列在高超声速风洞中的阿波罗型胶囊模型的相关实验。得克萨斯州A＆M大学的可调轮廓扩展设施提供了马赫数为6的实验，具有相对较低的雷诺数（2.5E5

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  • 来源
    《Journal of Spacecraft and Rockets》 |2019年第2期|405-420|共16页
  • 作者

    Radespiel Rolf; Ali Syed R. C.; Munoz Federico; Bowersox Rodney; Leidy Andrew; Tanno Hideyuki; Kirk Lindsay C.; Reshotko Eli;

  • 作者单位

    Braunschweig Univ Technol, Inst Fluid Mech, D-38108 Braunschweig, Germany;

    Braunschweig Univ Technol, Inst Fluid Mech, D-38108 Braunschweig, Germany;

    Braunschweig Univ Technol, Inst Fluid Mech, D-38108 Braunschweig, Germany;

    Texas A&M Univ, Aerosp Engn, MS 3141, College Stn, TX 77843 USA;

    Texas A&M Univ, Dept Aerosp Engn, MS 3141, College Stn, TX 77843 USA;

    JAXA Kakuda Space Ctr, Res & Dev Directorate, Res Unit 4, Kakuda, Miyagi 9811525, Japan;

    NASA Johnson Space Ctr, Houston, TX 77058 USA;

    Case Western Reserve Univ, Engn, Cleveland, OH 44106 USA;

  • 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
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