Laminar incipient separation in supersonic and hypersonic flows Online publication date: Fri, 31-Oct-2014
by T. Neuenhahn; H. Olivier
International Journal of Aerodynamics (IJAD), Vol. 2, No. 2/3/4, 2012
Abstract: 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 106 1/m to 107 1/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.
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