Suppression Of Axial Combustion Instability In
Solid Rocket Motors
Author(s)
D. R. Greatrix
Abstract
A numerical model for the prediction of undesirable axial combustion instability
symptoms in solid-propellant rocket motors is utilized in the process of
demonstrating various approaches for suppressing this instability behaviour. The
unsteady interior one- or two-phase flow in the motor chamber, the oscillation of
the surrounding structure of the propellant and motor casing, and the
corresponding transient combustion process, are all incorporated within this
comprehensive model. Example numerical results are presented for a cylindricalgrain
motor having differing characteristics with respect to particle loading and
grain geometry (fore and aft cross-sectional area changes), in illustrating the
effectiveness of the particular suppression technique being applied.
Keywords: solid rocket motor, combustion instability, particles, geometry.
1 Introduction
Over the last fifty years or so, there has been a number of research efforts
directed towards understanding the physical mechanisms, or at least the
surrounding factors, behind the appearance of symptoms associated with
nonlinear axial combustion instability in solid rocket motors (SRMs). The
motivation for these studies was and is of course to bring this better
understanding to bear in more precisely suppressing, if not eliminating, these
symptoms. Research towards predicting instability symptoms in SRMs
necessitates comprehensive numerical models for interior ballistic simulation
under dynamic flow and combustion conditions. An effective model combines
the effects of the unsteady flow, the transient combustion process, and the
structural dynamics of the surrounding propellant/casing structure. In the present
Keywords
solid rocket motor, combustion instability, particles, geometry.
Related Book
Other papers in this volume
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