Nonsteady Interior Ballistics Of
Cylindrical-grain 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 presented. The unsteady interior
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 model. The dynamic combustion process
is modelled via the Zeldovich-Novozhilov solid-phase energy conservation
approach, with a burning rate limiting function that allows for an applicable
alignment with observed experimental combustion response characteristics of a
given propellant. Example results from the overall numerical model are
presented for cylindrical-grain motors having differing characteristics with
respect to geometry and burning rate.
Keywords: solid rocket motor, combustion instability, transient flow.
1 Introduction
Research towards predicting and quantifying undesirable axial combustion
instability symptoms in solid-propellant rocket motors (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 investigation, a
numerical model incorporating the above attributes is used in the prediction of
the unsteady instability-related behaviour in cylindrical-grain motors. Pertinent
key parameters, like the burning rate limiting coefficient set the in the Zeldovich-
Novozhilov (Z-N) transient burning model (De Luca et al [1], Yang et al [2],
Greatrix [3]) are varied in a series of test simulations, and evaluated for any
Keywords
solid rocket motor, combustion instability, transient flow.
Related Book
Other papers in this volume
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