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Drag Reduction Using Aerodisks for Hypersonic Hemispherical Bodies

机译:使用航空磁盘对高超音速半球体进行减阻

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摘要

Themain challenge facing the designers of hypersonic vehicles is the significantly high levels of pressure drag andnaerodynamic heating. Although blunt noses are preferred for better heat distribution, they introduce substantialndrag to the vehicle. Spikes and aerodisks proved to be efficient drag and heating reduction devices. However, fornsome flow conditions and model designs, the flow around spiked bodies can be unstable, which deteriorates theirneffectiveness. In the present study, a numerical investigationwas conducted on a hemispherical body equippedwith anspike of variable length and a hemispherical aerodisk of variable size in laminar hypersonic freestreamconditions. Anmechanism is proposed to explain the drag reduction and the cause of flow instability based on the shape of anneffective body. In addition, the dependence of drag reduction on the spike’s detailed design was investigated. For thenmodels investigated in this work, an optimum aerodisk size produced the minimum drag and this optimum size wasnfound to be inversely proportional to the spike length.
机译:高超音速飞行器设计者面临的主要挑战是压力阻力和空气动力学加热的水平很高。尽管钝头是更好的热量分配首选,但它们会给车辆带来很大的阻力。事实证明,尖刺和磁盘是有效的减阻降温装置。但是,在繁琐的流动条件和模型设计中,尖刺体周围的流动可能会不稳定,从而降低其有效性。在本研究中,在层流高超音速自由流条件下,对半球体进行了数值研究,该半球体具有可变长度的前突和可变大小的半球形气碟。提出了用机理来解释基于有效体形状的减阻和流动不稳定性的原因。此外,还研究了减阻对长钉设计的依赖性。对于随后在这项工作中研究的模型,最佳的磁盘尺寸产生了最小的阻力,并且发现该最佳尺寸与峰值长度成反比。

著录项

  • 来源
    《Journal of Spacecraft and Rockets》 |2010年第1期|p.62-80|共19页
  • 作者单位

    University of Sheffield, Sheffield S1 3JD, England, United Kingdom;

  • 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

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