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No AccessFull-Length Paper

Analysis of Acoustics and Vortex Shedding Interactions in Hybrid Rocket Motors

Published Online:20 Oct 2014https://doi.org/10.2514/1.B35188

Abstract

Hybrid rocket engines usually have an aft-mixing chamber to improve combustion efficiency. The presence of a sudden expansion at the exit of the fuel port determines the formation of vortices, whose vigorous burning may drive acoustic waves in the chamber. The shedding of vortices itself is then affected by the flow fluctuations, producing a well-known feedback loop. A reduced-order model is used here to analyze this phenomenon. It is assumed that vortex burning is localized in space and time, and a kicked oscillator model is used. A one-dimensional model proposed by the authors is used to determine the values of the eigenacoustic modes and corresponding damping coefficients. Numerical results are compared with experimental data.

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