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首页> 外文期刊>Journal of visualization >Colour surface flow visualisation of interfering slender bodies at Mach 3
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Colour surface flow visualisation of interfering slender bodies at Mach 3

机译：干涉细长体在3马赫时的彩色表面流动可视化

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摘要

A study to understand the flow physics produced by two slender bodies in close proximity in highspeed airflow was undertaken. The interference flow field generated by the bodies is dominated by shock and expansion waves, and of particular significance is the complex interaction of the bow-shock wave emanating from the disturbance generator, striking the surface of the disturbance receiver. To gain insight into the shock wave-body interaction, the traditional surface oil flow visualisation technique was extended to include colour, which assists the eye in tracking the streak lines back to their separation and reattachment regions. In addition, the fine particle sizes of the colour pigment produced crisper and more definitive separation lines over the body, in comparison to the traditional monochrome pigments, such as lamp-black or titanium-dioxide. Subsequently, the dried surface pattern was lifted off the body using matte-acetate tape, digitised and then straightened using datum markings along the sting. This allowed the shock impingement location and shock diffraction path over the body to be established quantitatively, which was used to validate numerical simulations. The experimental and computational data showed good agreement for all configurations considered, providing complementary information about the disturbance-induced effects generated in the interference flow field, and provided detailed insight into the near-surface flow topology produced by the shock wave-slender body interaction.
机译：进行了一项研究，以了解两个细长体在高速气流中紧密相邻所产生的流动物理学。物体产生的干扰流场主要受到冲击波和膨胀波的影响，特别重要的是，扰动发生器发出的弓形冲击波会复杂地相互作用，撞击到扰动接收器的表面。为了深入了解冲击波与波体的相互作用，将传统的表面油流可视化技术扩展为包括颜色，该颜色可帮助眼睛跟踪条纹线回到其分离和重新附着区域。此外，与传统的单色颜料（如油黑或二氧化钛）相比，彩色颜料的细粒度在体内产生了更清晰，更明确的分离线。随后，使用哑光醋酸纤维胶带将干燥后的表面图案从身体上抬起，进行数字化处理，然后使用基准标记沿固定杆拉直。这样就可以定量地确定人体上的冲击撞击位置和冲击衍射路径，这可用于验证数值模拟。实验和计算数据表明，对于所考虑的所有配置都具有良好的一致性，提供了有关在干扰流场中产生的由干扰引起的影响的补充信息，并提供了对由激波-细长体相互作用产生的近地表流拓扑的详细了解。

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  • 来源
    《Journal of visualization》 |2015年第3期|413-423|共11页
  • 作者

    S. J. Hooseria; B. W. Skews;

  • 作者单位

    Flow Research Unit (FRU), School of Mechanical, Industrial and Aeronautical Engineering, University of the Witwatersrand, Johannesburg PO WITS 2050, South Africa;

    Flow Research Unit (FRU), School of Mechanical, Industrial and Aeronautical Engineering, University of the Witwatersrand, Johannesburg PO WITS 2050, South Africa;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Surface oil flow visualization; Compressible flow; Shock wave; Slender body;

    机译：表面油流可视化;可压缩流量激波;苗条的身材;

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