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Combustion instability sustained by unsteady vortex combustion

Smith, D. A. and Zukoski, E. E. (1985) Combustion instability sustained by unsteady vortex combustion. AIAA Papers, AIAA-85-1248. American Institute of Aeronautics and Astronautics . http://resolver.caltech.edu/CaltechAUTHORS:20101206-101510045

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Abstract

The determination of an internal feedback mechanism which leads to combustion instability inside a small scale laboratory combustor is presented in this paper. During combustion instability, the experimental findings show that a large vortical structure is formed at an acoustic resonant mode of the system. The subsequent unsteady burning, within the vortex as it is convected downstream, feeds energy into the acoustic field and sustains the large resonant oscillations. These vortices are formed when the acoustic velocity fluctuation at the flameholder is a large fraction of the mean flow velocity. The propagation of these vortices is not a strong function of the mean flow speed and appears to be dependent upon the frequency of the instability. Continued existence of large vortical structures which characterize unstable operation depends upon the fuel-air ratio, system acoustics, and fuel type.


Item Type:Report or Paper (Report)
Additional Information:© American Institute of Aeronautics and Astronautics, Inc., 1985. Financial support for this work was provided under AFOSR Grant No. 80-0286.
Group:Guggenheim Jet Propulsion Center
Funders:
Funding AgencyGrant Number
Air Force Office of Scientific Research (AFOSR)80-0286
Other Numbering System:
Other Numbering System NameOther Numbering System ID
Guggenheim Jet Propulsion CenterUNSPECIFIED
AIAA85-1248
Record Number:CaltechAUTHORS:20101206-101510045
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20101206-101510045
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:21176
Collection:CaltechAUTHORS
Deposited By: Ruth Sustaita
Deposited On:13 Dec 2010 19:11
Last Modified:26 Dec 2012 12:43

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