Hypersonic transitional shock-wave–boundary-layer interaction on a flat plate

Gaetano M.D. Currao, Rishabh Choudhury, Sudhir L. Gai, Andrew J. Neely, David R. Buttsworth

研究成果: Article同行評審

17 引文 斯高帕斯(Scopus)

摘要

This work presents an experimental and numerical study of hypersonic transitional shock-wave–boundary-layer interaction, wherein transition occurs between separation and reattachment in the detached shear layer. Experiments were conducted in a free-piston compression-heated Ludwieg tube that provided a Mach 5.8 flow at a freestream Reynolds number of 7 × 106 m−1. A shock generator deflected the flow by 10°, resulting in an oblique shock impinging on a flat plate. The shock triggered transition in the boundary layer and the formation of Görtler-like vortices downstream of reattachment. Heat flux and pressure distributions on the plate were measured globally using infrared thermography and pressure-sensitive paint. Oil film visualization was employed to evaluate the boundary-layer reattachment. Numerical results consist of Reynolds-averaged Navier–Stokes and fully laminar steady-state three-dimensional simulations. Shock-induced transition is considered to be the cause of the overshoot in peak pressure and peak heating of approximately 15%, in agreement with previous studies. Görtler instability, triggered by the concave nature of the bubble at separation, is identified as the main mechanism leading to boundary-layer transition, resulting in heat-flux variations of less than 30%. By comparing numerical results against thermographic values it is possible to delineate the extent of transition. Within this region, the disturbance amplification factor was estimated to be approximately between 6 and 10, in reasonable agreement with other relevant numerical and experimental data.

原文English
頁(從 - 到)814-829
頁數16
期刊AIAA journal
58
發行號2
DOIs
出版狀態Published - 2020

All Science Journal Classification (ASJC) codes

  • 航空工程

指紋

深入研究「Hypersonic transitional shock-wave–boundary-layer interaction on a flat plate」主題。共同形成了獨特的指紋。

引用此