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Longitudinal Mode Combustion Instabilities in a Dump Combustor

Sterling, J. D. and Zukoski, E. E. (1987) Longitudinal Mode Combustion Instabilities in a Dump Combustor. AIAA Papers, AIAA-87-0220. American Institute of Aeronautics and Astronautics .

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The mechanism by which longitudinal modes of a dump combustor are excited has been investigated. The unsteady combustion is a result of the shedding of large scale vortical structures from the flameholder. Driving and damping as determined by Rayleigh's criterion were investigated by using the cross-spectrum and phase of the fluctuating pressure and radiation intensity signals at various locations in the combustor. Thus, the excitation of a particular mode was found to depend on the pressure mode shape and the magnitude and phase of the velocity fluctuation at the flameholder. Fluid mechanical mixing and the chemical reaction rate of the fuel also effect the distribution of heat release and hence the locations of driving and damping. Finally, a mechanism for existence of the limit cycle is discussed.

Item Type:Report or Paper (Report)
Additional Information:© American Institute of Aeronautics and Astronautics, Inc., 1987. Financial support for this work was provided under AFOSR Grant No. 84-0286.
Group:Guggenheim Jet Propulsion Center
Funding AgencyGrant Number
Air Force Office of Scientific Research (AFOSR)84-0286
Other Numbering System:
Other Numbering System NameOther Numbering System ID
Guggenheim Jet Propulsion Center288
Series Name:AIAA Papers
Issue or Number:AIAA-87-0220
Record Number:CaltechAUTHORS:20101202-073712764
Persistent URL:
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:21106
Deposited By: Ruth Sustaita
Deposited On:04 Dec 2010 00:38
Last Modified:03 Oct 2019 02:19

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