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Fluctuations above a burning heterogeneous propellant

Published online by Cambridge University Press:  22 May 2007

L. MASSA ,
T. L. JACKSON ,
J. BUCKMASTER  and
F. NAJJAR
L. MASSA
Affiliation:
Center for Simulation of Advanced Rockets, University of Illinois at Urbana-Champaign, 1304 West Springfield Avenue, Urbana, IL 61801, USA
T. L. JACKSON
Affiliation:
Center for Simulation of Advanced Rockets, University of Illinois at Urbana-Champaign, 1304 West Springfield Avenue, Urbana, IL 61801, USA
J. BUCKMASTER*
Affiliation:
Center for Simulation of Advanced Rockets, University of Illinois at Urbana-Champaign, 1304 West Springfield Avenue, Urbana, IL 61801, USA
F. NAJJAR
Affiliation:
Center for Simulation of Advanced Rockets, University of Illinois at Urbana-Champaign, 1304 West Springfield Avenue, Urbana, IL 61801, USA
*
†Author to whom correspondence should be addressed: Buckmaster Research, 2014 Boudreau Drive, Urbana, IL 61801, USA, [email protected]
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Abstract

A numerical description of heterogeneous propellant combustion enables us to examine the spatial and temporal fluctuations in the flow field arising from the heterogeneity. Particular focus is placed on the fluctuations in a zone intermediate between the combustion field (where reaction is important) and the chamber flow domain, for these define boundary conditions for simulations of the turbulent chamber flow. The statistics of the temperature field and the normal velocity field are described, and characteristic length scales and time scales are identified. The length scales are small compared to any relevant length scale of the chamber flow, and so the boundary conditions for this flow at any mesh point are statistically independent of those at any other mesh point. But the temporal correlations at a fixed point are significant, and affect the nature of the chamber flow in a variety of ways. We describe the fluctuations in the head-end pressure that arise because of them, and contrast these results with those calculated using a white-noise assumption.

Type
Papers
Information
Journal of Fluid Mechanics , Volume 581 , 25 June 2007 , pp. 1 - 32
Copyright
Copyright © Cambridge University Press 2007

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