Roh, T. S. and Culick, F. E. C. (1997) Numerical study of acoustic oscillations and combustion instabilities in solid propellant rocket. In: Proceedings of the 34th JANNAF Combustion Subcommittee Meeting. CPIA publication. Vol.2. No.662. Chemical Propulsion Information Agency , Laurel, MD, pp. 141-151. http://resolver.caltech.edu/CaltechAUTHORS:20110128-075156436
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A numerical analysis of unsteady motions in solid rocket motors has been conducted. A fully coupled implicit scheme based on a dual time-stepping integration algorithm has been adopted to solve the governing equations and associated boundary conditions. A narrow pressure pulse is imposed at the head end to simulate unsteady acoustic oscillations in the combustion chamber. Pressure increases when the front of the pulse reaches near the nozzle area. Self-generated oscillations with frequency of standing wave propagates upstream in the combustion chamber. Investigation of transient response of gas-phase dynamics to traveling pressure wave and its effects on propellant combustion reveals several aspects: Combustion responses have a strong relationship with vorticity fluctuations in case of high turbulent intensity on the propellant surface. Temperature fluctuations of the propellant surface in the head end region seem to be very unstable and independent of the pressure wave. Surface temperature without turbulence effect looks more sensitive to temperature fluctuations in the primary flame zone. Stability of surface temperature is strongly related to turbulent intensity on the propellant surface.
|Item Type:||Book Section|
|Additional Information:||© 1997. This work has been partially supported by the Caltech Multidisciplinary University Research Initiative under ONR Grant No. N00014-95-1-1338; Dr. Richard S. Miller of the Office of Naval Research is Program Manager. Approved for public release; distribution is unlimited.|
|Group:||Guggenheim Jet Propulsion Center, GALCIT|
|Other Numbering System:|
|Official Citation:||Document Number 19980217972 Copyright Indicator No Copyright Subject Category Spelled-out Acoustics Total Page 11p Document Type Conference Paper NASA Major Index Term - Controlled COMBUSTION CHAMBERS SOLID PROPELLANT ROCKET ENGINES SOLID PROPELLANTS STANDING WAVES SOUND WAVES PROPELLANT COMBUSTION NASA Minor Index Term - Controlled BOUNDARY CONDITIONS MEASURE AND INTEGRATION PRESSURE PULSES VAPOR PHASES TURBULENCE EFFECTS ELASTIC WAVES Record Type NASA STI|
|Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited By:||Ruth Sustaita|
|Deposited On:||31 Jan 2011 20:10|
|Last Modified:||22 Sep 2016 21:52|
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