An experimental and numerical study of hypersonic turbulent boundary layer flows

Hillier, R.; Zanchetta, M.; Soltani, Saeed; Kirk, D.

doi:10.2514/6.1997-2290

Cited by 2 publications

(1 citation statement)

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“…Aided by preliminary computations, a cavity depth of 25 mm was chosen as the minimum to resolve as much as possible of the very steep flow gradients expected near the reattachment lip. The unit Reynolds number given in table 1 is the lowest feasible operating value for the tunnel but tests by Mallinson et al (1997b) showed that it should be sufficient to maintain laminar attached boundary layer flow up to a chord length of at least 400 mm. Knowledge of compressible free shear layer transition is incomplete, but various hypersonic cavity studies (for example Chapman, Kuehn & Larson 1958;Nicholl 1964;Larson & Keating 1960) have all suggested that the separated shear layer for a surface cavity is 'as stable as the corresponding attached laminar boundary layer'.…”

Section: Model Design Criteriamentioning

confidence: 99%

Experimental and computational study of laminar cavity flows at hypersonic speeds

2001

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This paper presents a combined experimental/computational study of a surface cavity in a low Reynolds number Mach 9 flow. The geometry is based on a body of revolution, which produces highly two-dimensional time-averaged flow for all experimental test cases. A range of cavity length-to-depth ratios, up to a maximum of 8, is investigated. These correspond to ‘closed’ cavity flows, with the free shear layer bridging the entire cavity. For most cases the free shear layer is laminar. However, there is evidence of three-dimensional unsteadiness which is believed to be the consequence of Taylor–Görtler-type vortex formation. The effect of this is first detected on the cavity floor but progressively spreads as the cavity length is increased. For the longest cavities the flow is also influenced by the early stages of laminar–turbulent transition in the free shear layer.

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Section: Model Design Criteriamentioning

confidence: 99%