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8 - Shock Wave???Boundary-Layer Interactions Occurring in Hypersonic Flows in the Upper Atmosphere

Published online by Cambridge University Press:  05 June 2012

Holger Babinsky
Affiliation:
University of Cambridge
John K. Harvey
Affiliation:
Imperial College London
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Summary

Introduction

Many hypersonic vehicles are designed to follow trajectories that extend well into the upper atmosphere where the density is extremely low. Despite this, aerodynamic heating is still a critical issue because of the very high flight velocity. The U.S. Space Shuttle Orbiter, for instance, experienced peak heating at a height of about 74 km even though ambient density at that altitude is not much more than one millionth of sea-level density. Shock wave–boundary-layer interactions (SBLIs) that occur within these flows are nearly always sites of intense localized heating; thus, it is essential to predict the level correctly to avoid vehicle structural failure or incurring unnecessary weight penalties by carrying excessive thermal protection.

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