A Simplified Model for the Investigation of Acoustically Driven Combustion Instabilities

TITLE AND SUBTITLE:
A Simplified Model for the Investigation of Acoustically Driven Combustion Instabilities

AUTHOR(S):
D. Dane Quinn and Daniel E. Paxson

REPORT DATE:
November 1998

FUNDING NUMBERS:
WU-523-26-13-00

PERFORMING ORGANIZATION NAME(S) AND ADDRESS(ES):
National Aeronautics and Space Administration
Lewis Research Center
Cleveland, Ohio 44135-3191

PERFORMING ORGANIZATION REPORT NUMBER:
E-11267

SPONSORING/MONITORING AGENCY NAME(S) AND ADDRESS(ES):
National Aeronautics and Space Administration
Washington, DC 20546-0001

REPORT TYPE AND DATES COVERED:
Technical Memorandum

SPONSORING/MONITORING AGENCY REPORT NUMBER:
NASA TM-1998-208488
AIAA-98-3764

SUPPLEMENTARY NOTES:
Prepared for the 34th Joint Propulsion Conference cosponsored by AIAA, ASME, SAE, and ASEE, Cleveland, Ohio,
July 12-15, 1998. D. Dane Quinn, The University of Akron, Department of Mechanical Engineering, Akron, Ohio 44325-3903 and Summer Faculty Fellow at NASA Lewis Research Center; Daniel E. Paxson, NASA Lewis Research Center. Responsible person, Daniel E. Paxson, organization code 5530, (216) 433-8334.

ABSTRACT:
A simplified one-dimensional model of reactive flow is presented which captures features of aeropropulsion systems, including acoustically driven combustion instabilities. Although the resulting partial differential equations are one dimensional, they qualitatively describe observed phenomena, including resonant frequencies and the admission of both steady and unsteady behavior. A number of simulations are shown which exhibit both steady and unsteady behavior, including flame migration and thermo acoustic instabilities. Finally, we present examples of unsteady flow resulting from fuel modulation.

SUBJECT TERMS:
Combustion; Computational

NUMBER OF PAGES:
16

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