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Numerical study of gaseous reactive flow over a ram accelerator projectile in subdetonative velocity regime

Published online by Cambridge University Press:  21 July 2011

T. Bengherbia ,
Y. F. Yao ,
P. Bauer  and
C. Knowlen
T. Bengherbia*
Affiliation:
Laboratoire de Combustion et de Détonique (CNRS), ENSMA Poitiers, BP 109, 86960 Futuroscope Cedex, France Faculty of Engineering, Kingston University, Roehampton Vale, Friars Avenue, SW15 3, DW London, UK
Y. F. Yao
Affiliation:
Faculty of Engineering, Kingston University, Roehampton Vale, Friars Avenue, SW15 3, DW London, UK
P. Bauer
Affiliation:
Laboratoire de Combustion et de Détonique (CNRS), ENSMA Poitiers, BP 109, 86960 Futuroscope Cedex, France
C. Knowlen
Affiliation:
Department of Aeronautics and Astronautics, University of Washington, Box 352250, Seattle, WA, 98195 2250, USA
*
ae-mail: tarek.bengherbia@lcd.ensma.fr
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Abstract

Computational fluid dynamics solutions of the Reynolds Averaged Navier-Stokes equations have been used to numerically predict the thrust of a thermally choked ram accelerator in subdetonative velocity regime. Studies were focused on a projectile operating in a 38-mm-diameter ram accelerator tube loaded with premixed propellant gas; methane/oxygen/nitrogen at 5.15 MPa fill pressure. Simulations were carried out for a series of incoming velocities. The shear stress transport turbulence model (SST) and the eddy dissipation combustion model (EDM) with five-step reaction mechanism were used to simulate the fully turbulent reactive flow field around the projectile. The predicted projectile thrust-velocity agreed well with the experimental measurements, in addition, the CFD predicted pressure variation and magnitude along projectile axial direction also agreed well with the test data. The present investigation reveals some key features of the shock-wave system around the projectile, which are important in determining the characteristics of the thermally choked propulsive mode. These findings are useful in understanding the characteristics of high speed turbulent combustion process in the ram accelerator.

Type
Research Article
Information
The European Physical Journal - Applied Physics , Volume 55 , Issue 1: Focus on Hakone XII , July 2011 , 11102
Copyright
© EDP Sciences, 2011

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