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Laminar incipient separation in supersonic and hypersonic flows

机译:超音速和高音速流动中的层流初始分离

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摘要

In this article, a correlation for the incipient separation angle is presented being valid for laminar boundary layers in supersonic and hypersonic flows. Such correlation is based on physical reasoning and numerical flow simulations whereby the latter were performed for a Mach number range of 1.5 and 15, unit Reynolds numbers of 10~6 l/m to 10~7 l/m and wall temperature ratios of 1.35 to 2.7. The derived correlation was verified with additional numerical simulations featuring different Mach number, wall temperature and Reynolds number combinations compared to the combination employed for the derivation of the correlation. The comparison of the newly developed correlation with correlations of Rizetta et al. (1978), Edelmann et al. (2007), Katzer (1989), Greber et al. (1958), Needham and Stollery (1966), and Holden (1971) shows good agreement within the range of free stream conditions, under which the other correlations had been developed with. The new correlation spans a wide range of free stream conditions thus includes all free stream conditions employed by the researchers mentioned above.
机译:在本文中,提出了初分离角的相关性对超音速和高超音速流动中的层流边界层有效。这种相关性基于物理推理和数值流模拟,其中后者在1.5和15的马赫数范围内进行,单位雷诺数为10〜6 l / m至10〜7 l / m,壁温比为1.35至10。 2.7。与用于推导相关性的组合相比,通过具有不同马赫数,壁温和雷诺数组合的附加数值模拟对导出的相关性进行了验证。新开发的相关性与Rizetta等人的相关性的比较。 (1978),Edelmann等。 (2007),Katzer(1989),Greber等。 (1958),Needham和Stollery(1966)和Holden(1971)在自由流条件范围内显示出良好的一致性,在这种条件下还建立了其他相关性。新的相关性涵盖了广泛的自由流条件,因此包括了上述研究人员采用的所有自由流条件。

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