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Combustion instabilities: mating dance of chemical, combustion, and combustor dynamics

Culick, F. E. C. (2000) Combustion instabilities: mating dance of chemical, combustion, and combustor dynamics. AIAA Papers, AIAA-2000-3178. American Institute of Aeronautics and Astronautics . http://resolver.caltech.edu/CaltechAUTHORS:20101115-083329034

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Abstract

Combustion instabilities exist as consequences of interactions among three classes of phenomena: chemistry and chemical dynamics; combustion dynamics; and combustor dynamics. These dynamical processes take place simultaneously in widely different spatial scales characterized by lengths roughly in the ratios (10^(-3) - 10^(-6)):1:(10^3-10^6). However, due to the wide differences in the associated characteristic velocities, the corresponding time scales are all close. The instabilities in question are observed as oscillations having a time scale in the range of natural acoustic oscillations. The apparent dominance of that single macroscopic time scale must not be permitted to obscure the fact that the relevant physical processes occur on three disparate length scales. Hence, understanding combustion instabilities at the practical level of design and successful operation is ultimately based on understanding three distinct sorts of dynamics.


Item Type:Report or Paper (Report)
Additional Information:© 2000 by F.E.C. Culick, California Institute of Technology. This work was sponsored partly by the California mstitute of Technology, the ONR Multidisciplinary University Research mitiative (MURI) Grant No. N00014-95-1-1338, the Advanced Gas Turbine Research Center (AGTSR) and ENEL. During the preparation of this paper I have benefited greatly from the careful reading and constructive remarks by Mr. Norman Cohen. Mr. Giorgio Isella carried out all calculations in sections 4 and 5. I am indebted to Dr. F. Vuillot for providing me with complete set of references, with comments, covering the French work on vortex shedding.
Group:Guggenheim Jet Propulsion Center
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Guggenheim Jet Propulsion Center399
AIAA2000-3178
Record Number:CaltechAUTHORS:20101115-083329034
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20101115-083329034
Official Citation:Culick, F. E. C., California Inst. of Technology, Pasadena AIAA-2000-3178 AIAA/ASME/SAE/ASEE Joint Propulsion Conference and Exhibit, 36th, Huntsville, AL, July 16-19, 2000
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:20791
Collection:CaltechAUTHORS
Deposited By: Ruth Sustaita
Deposited On:03 Dec 2010 23:59
Last Modified:26 Dec 2012 12:38

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