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Nonlinear Dynamics of Laboratory Combustor Pressure Oscillations

Sterling, J. D. and Zukoski, E. E. (1991) Nonlinear Dynamics of Laboratory Combustor Pressure Oscillations. Combustion Science and Technology, 77 (4-6). pp. 225-238. ISSN 0010-2202. doi:10.1080/00102209108951729.

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The mechanisms responsible for driving and damping of pressure oscillations in a laboratory combustor have been investigated. The chamber contains a turbulent methane/hydrogen/air premixed flame stabilized behind a rearward-facing step. Shadowgraph cinematography reveals the shedding of large vortices from the step at frequencies of the system acoustic modes. Variations in the fuel equivalence ratio and the mean flow speed result in a wide variety of nonlinear dynamical behavior. Typically, large cycle-to-cycle variations are observed such that energy may be added or subtracted over one cycle of oscillation but zero net energy change occurs many cycles of oscillation. A quantitative version of Rayleigh's Criterion is constructed by using the cross-spectral-density of the measured flame radiation and pressure. The results under one set of operating conditions show that large driving near the flameholder is balanced by equally large damping further downstream. A second set of conditions results in large energy addition to an acoustic mode balanced by attenuation at the mode subharmonic.

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Additional Information:© 1991 Gordon and Breach. Received July 20, 1990; in final form January 30, 1991. The authors would like to thank Professor Toshi Kubota for helpful comments made during this work. The research was supported by the Air Force Office of Scientific Research under the technical management of Dr J. Tishkoff.
Group:Guggenheim Jet Propulsion Center
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Air Force Office of Scientific Research (AFOSR)UNSPECIFIED
Subject Keywords:Combustion instabilities; Rayleigh's criterion; Dynamical systems
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Guggenheim Jet Propulsion CenterUNSPECIFIED
Issue or Number:4-6
Record Number:CaltechAUTHORS:20101130-110248831
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Official Citation:Nonlinear Dynamics of Laboratory Combustor Pressure Oscillations J. D. Sterling; E. E. Zukoski Pages 225 – 238
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:21060
Deposited By: Ruth Sustaita
Deposited On:01 Dec 2010 18:31
Last Modified:09 Nov 2021 00:05

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