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Investigation of flow asymmetry around axi-symmetric spiked blunt bodies in hypersonic speeds

Published online by Cambridge University Press:  27 January 2016

Mahmoud Y. M. Ahmed  and
N. Qin
Mahmoud Y. M. Ahmed
Affiliation:
Department of Mechanical Engineering, University of Sheffield, Sheffield, UK
N. Qin*
Affiliation:
Department of Mechanical Engineering, University of Sheffield, Sheffield, UK
*
[email protected]
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Abstract

The assumption that a zero-incidence flow around bodies of revolution is axisymmetric has been broadly adopted by many researchers, even for cases where the flow around such bodies becomes unstable. In this study, the validity of this assumption is revisited using CFD simulation. As a case study, the simulations of both stable and unstable hypersonic flows around spiked blunt bodies in 2D axisymmetric and full 3D computational domains are compared. It is found that, for the stable flow cases, the main flow features are apparently axisymmetric and the assumption is generally acceptable. However, some degree of asymmetry can be observed inside the shear layer in the separated region, causing small variation in the drag coefficient. For the unstable flow cases, the asymmetry of the flow features is much more significant. More importantly, the assumption that the flow is axisymmetric is found to overestimate the level of flow unsteadiness. The amplitude of temporal drag variation as predicted by the axisymmetric solution is higher than that predicted by the full 3D solution.

Type
Research Article
Information
The Aeronautical Journal , Volume 118 , Issue 1200 , February 2014 , pp. 169 - 179
Copyright
Copyright © Royal Aeronautical Society 2014 

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