A Computational Investigation of Inviscid Hypervelocity Flow of a Dissociating Gas Past a Cone at Incidence

Macrossan, Michael N. and Pullin, Dale I. (1994) A Computational Investigation of Inviscid Hypervelocity Flow of a Dissociating Gas Past a Cone at Incidence. Journal of Fluid Mechanics, 266 69-92.

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Author Macrossan, Michael N.
Pullin, Dale I.
Title A Computational Investigation of Inviscid Hypervelocity Flow of a Dissociating Gas Past a Cone at Incidence
Journal name Journal of Fluid Mechanics   Check publisher's open access policy
ISSN 0022-1120
Publication date 1994-01-01
Sub-type Article (original research)
DOI 10.1017/S0022112094000935
Volume 266
Start page 69
End page 92
Total pages 24
Language eng
Subject 240502 Fluid Physics
290299 Aerospace Engineering not elsewhere classified
Abstract Calculations have been performed for the inviscid hypervelocity flow of nitrogen past a 15 degree semi-angle sharp cone at an incidence of 30 degree, at an enthalphy sufficiently high to produuce dissociation/recombination chemistry downstream of the bow shock wave. A spatially second-order-accurate EFM (Equilibrium Flux Method) scheme for the numerical solution of the inviscid Euler equations was used, combined with the Lighthill-Freeman model of the non-equilibrium ideal dissociating gas. The computations have been sued to gain an understanding fo the interaction between the ags dynamics and the finite-rate chemistry. Inviscid flow has been considered to ensure that the only physical length scales in the flow are those associated with the chemical reactions. It was found that a chemical length scale L_s, based on the local dissociation length behind the shock on the windward plane of symmetry is an important governing parameter of the flow. However, as the flow length-scale becomes large and the flow approached the limiting case of equilibrium chemistry, L_s is not the dominant chemical length-scale, particularly in the leeward flow which contains a shock-vortex structure. A simple modelling technique has been used to determine a more appropriate length scale L_r for the leeward flow, based on the equilibrium conditions behind the leeward cross-flow shock.
Keyword non-equilibrium chemistry flow
dissociating flow
high enthalpy
3D re-entry flow
chemistry-vorticity
EFM
Equilibrium Flux Method
second-order kinetic scheme
Euler equations
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Unknown
Additional Notes Citation: Macrossan, Michael N. and Pullin, Dale I. (1994) A Computational Investigation of Inviscid Hypervelocity Flow of a Dissociating Gas Past a Cone at Incidence. Journal of Fluid Mechanics 266: 69-72. doi:10.1017/S0022112094000935 Copyright 1994 Cambridge University Press. All rights reserved.

Document type: Journal Article
Sub-type: Article (original research)
Collection: School of Mechanical & Mining Engineering Publications
 
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Created: Fri, 27 Jan 2006, 10:00:00 EST by Michael N Macrossan