Acoustic Resonance of Simulated Solid Rocket Motor Chamber with Transient Sidewall Mass Additions
Citation
A. M., Hegab, S. A. Gutub"Acoustic Resonance of Simulated Solid Rocket Motor Chamber with Transient Sidewall Mass Additions", International Journal of Engineering Trends and Technology (IJETT), V27(1),51-59 September 2015. ISSN:2231-5381. www.ijettjournal.org. published by seventh sense research group
Abstract
An asymptotic technique is integrated
with computational solution development to describe
the generation and evolution of intense unsteady
vorticity and the accompanying temperature response
in a model of solid rocket motor (SRM) chamber with
low Mach number, weakly viscous internal flow. The
chamber considered here has a rectangular cross
section, has to equally permeable walls, closed at the
head end, and is opened at the downstream end. An
initially steady internal flow from steady sidewall
injection is generated. Then an additional transient
sidewall mass injection with different wave numbers
at resonance frequency is initiated. The unsteady mass
injection is used to simulate the transient propellant
combustion occurring on the sidewall in a real SRM
chamber. The current study accounts a wide range of
high wave numbers wall injection at resonance and
near-resonance frequencies. The analytical approach
is based on the reduced form of the Navier-Stokes
using asymptotic technique. The results show that
unexpectedly large transient shear stresses and
temperature gradients are created at the sidewall of
the chamber at resonance frequencies and low wave
numbers. A comparison between the analytical,
computational and experimental results is performed.
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Keywords
Solid Rocket Motor Chamber, Unsteady
Vorticity, Transient Mass Injection, Internal Cavity.