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Theoretical approach and experimental verification of the role of diffusive transport under binary scaling conditions

机译：二元尺度条件下扩散传输作用的理论方法和实验验证

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摘要

The binary scaling law is commonly used to study the aerothermodynamics of hypersonic vehicles in ground-based facilities. Its application is usually restricted to situations where diffusive transport is neglected. However, as demonstrated in this paper, the diffusion processes are embedded in the Peclet and wall Damkoehler numbers, which are conserved through the duplication of the binary scaling similitude parameters, namely the nature of the gas, the free-stream enthalpy h_∞ and the product of a density and a length-scale of the flow ρL. The role of diffusion is first demonstrated theoretically, and then experimentally through the obtention of binary scaled boundary layers in the Plasmatron, a plasma wind tunnel at the von Karman Institute. The stagnation point heat fluxes were measured and exhibit a good agreement with the theoretical scaling law. This also validates the use of the binary scaling law in subsonic high enthalpy flows.
机译：二元比例定律通常用于研究地面设施中高超音速飞行器的空气动力学。它的应用通常仅限于忽略扩散运输的情况。但是，正如本文所论证的那样，扩散过程被嵌入到Peclet和壁的Damkoehler数中，这些扩散过程是通过复制二元尺度相似性参数（即气体的性质，自由流焓h_∞和氢的密度）来守恒的。流量ρL的密度​​和长度比例的乘积。首先在理论上证明了扩散的作用，然后通过在冯·卡曼研究所的等离子风洞Plasmatron中获得了二元尺度的边界层来进行了实验。测量了驻点热通量，并显示出与理论比例定律的良好一致性。这也验证了亚音速高焓流中二元比例定律的使用。

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    G. de Crombrugghe; R. Morgan; O. Chazot;

  • 作者单位

    Centre for Hypersonics, University of Queensland, Brisbane 4072, Australia;

    Centre for Hypersonics, University of Queensland, Brisbane 4072, Australia;

    Von Karman Institute, Sint-Genesius-Rode 1640, Belgium;

  • 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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