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One-dimensional modeling of ram accelerator at high accelerationrates in the subdetonative velocity regime

Published online by Cambridge University Press:  21 December 2004

P. Bauer ,
C. Knowlen  and
A. P. Bruckner
P. Bauer*
Affiliation:
Laboratoire de Combustion et de Détonique (UPR 9028), ENSMA, BP 109, 86961 Futuroscope Cedex, France
C. Knowlen
Affiliation:
University of Washington, AERP, Box 352250, Seattle, WA 98195-2250, USA
A. P. Bruckner
Affiliation:
University of Washington, AERP, Box 352250, Seattle, WA 98195-2250, USA
*
[email protected]
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Abstract

The predicted acceleration performance of the ram accelerator at elevated pressures, based on the quasi-steady model, is much greater than that observed in experiments. This discrepancy is attributed to the increase of mass of the propellant accumulating in the control volume, such that it approaches the mass of the projectile itself. A revision of the conservation equations to account for unsteady flow effects was conducted. The corresponding predicted thrust as a function of Mach number is significantly less than that derived from the quasi-steady model. By using a virial-type equation of state for the combustion products, a better agreement with experimental data was obtained using this unsteady modeling approach.

Keywords

Type
Research Article
Information
The European Physical Journal - Applied Physics , Volume 29 , Issue 3 , March 2005 , pp. 253 - 258
Copyright
© EDP Sciences, 2005

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References

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