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A Numerical Study on Acoustic Damping Induced by Gap between Baffled Injectors in a Model Rocket Combustor  

Sohn, Chae-Hoon (세종대학교 기계항공우주공학부)
Lee, Jung-Yun (조선대학교 대학원 항공우주공학과)
Publication Information
Journal of the Korean Society of Propulsion Engineers / v.11, no.3, 2007 , pp. 35-42 More about this Journal
Abstract
Acoustic damping induced by gap width between baffled injectors is investigated numerically, which are installed to suppress pressure oscillations in a model rocket combustor. The previous work reported that the baffled injectors show larger acoustic damping with the gap width between injectors. It is simulated numerically and its mechanism is examined. Damping factors are calculated as a function of gap width and it is found that the optimum gap is 0.1 mm or so. For understanding of the improved damping induced by the gap, dissipation rate of turbulent kinetic energy and vorticity are calculated as a function of the gap. Both parameters have their maximum values at the specific gap and especially, the dissipation rate has the same profile as that of damping factor. It verifies that the improved damping made by the gap is attributed to the increased acoustic-energy dissipation.
Keywords
Acoustic Damping; Baffled Injector; Energy Dissipation; Dissipation Rate; Vorticity;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
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