Publication Date:
2019-08-13
Description:
Common in the operation of both segmented and un-segmented large solid rocket motors is the occurrence of vortex shedding within the motor chamber. A portion of the energy within a shed vortex is converted to acoustic energy, potentially driving the longitudinal acoustic modes of the motor in a quasi-discrete fashion. This vortex shedding-acoustic mode excitation event occurs for every Reusable Solid Rocket Motor (RSRM) operation, giving rise to subsequent axial thrust oscillations. In order to better understand this vortex shedding/acoustic mode excitation phenomena, unsteady CFD simulations were run for both a test geometry and the full scale RSRM geometry. This paper covers the results from the subscale geometry runs, which were based on work focusing on the RSRM hydrodynamics. Unsteady CFD simulation parameters, including boundary conditions and post-processing returns, are reviewed. The results were further post-processed to identify active acoustic modes and vortex shedding characteristics. Probable locations for acoustic energy generation, and subsequent acoustic mode excitation, are discussed.
Keywords:
Acoustics
Type:
M10-1085
,
27th Rocket Technology (RNTS); Dec 06, 2010 - Dec 10, 2010; Orlando, FL; United States|36th Explosives Development and Characterization (PEDCS); Dec 06, 2010 - Dec 10, 2010; Orlando, FL; United States|JANNAF Joint Propulsion Committee Meeting; Dec 06, 2010 - Dec 10, 2010; Orlando, FL; United States|40th Structures and Mechanical Behavior (SMBS); Dec 06, 2010 - Dec 10, 2010; Orlando, FL; United States
Format:
application/pdf
Permalink