Establishment Times of Hypersonic Shock-Wave/Boundary-Layer Interactions in Intermittent Facilities

Abstract

This study examines establishment times of shock-wave boundary-layer interactions across a range of interaction types and intermittent facilities. Successful design of a test-article for a short duration facility is difficult, especially when trying to guarantee establishment of the flow. While this study does not detail design methodologies of a test article it does aim to provide better understanding of establishment metrics and predictive methods that have emerged from other studies in order to help in the design and assessment of experiments. Experimental and numerical data was taken at Mach 8.9 on an axisymmetric blunt-nosed body with an eight degree flare and laminar boundary-layer. It is shown that the global applicability of any single metric is poor and hence an establishment criteria is developed for this study which provides a more global metric of establishment. Further, a framework is provided for when the use of existing establishment metrics is appropriate.

Instability and transition onset downstream of a laminar separation bubble at Mach 6

“…2012; Vanstone et al. 2013, 2017; Vanstone & Clemens 2019). Most recently, Estruch-Samper, Hiller & Vanstone (2022) used a roughness element on a blunt cylinder-flare, which produced isolated turbulent spots, to study the collapse and re-establishment of a laminar separation bubble at Mach 9.…”

“…The second mode then proceeded to amplify in the boundary layer downstream of reattachment. The effect of intermittent turbulent spots on hypersonic separation bubbles has also been studied (Estruch-Samper et al 2012;Vanstone et al 2013Vanstone et al , 2017Vanstone & Clemens 2019). Most recently, Estruch-Samper, Hiller & Vanstone (2022) used a roughness element on a blunt cylinder-flare, which produced isolated turbulent spots, to study the collapse and re-establishment of a laminar separation bubble at Mach 9.…”