Acoustic Resonance of Simulated Solid Rocket Motor Chamber with Transient Sidewall Mass Additions
|International Journal of Engineering Trends and Technology (IJETT)||
|© 2015 by IJETT Journal|
|Year of Publication : 2015|
|Authors : A. M., Hegab, S. A. Gutub
|DOI : 10.14445/22315381/IJETT-V27P209|
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
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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Solid Rocket Motor Chamber, Unsteady Vorticity, Transient Mass Injection, Internal Cavity.