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An experimental study of coupling between combustor pressure, fuel/air mixing, and the flame

Kang, Dal Mo and Culick, F. E. C. and Ratner, Abert (2005) An experimental study of coupling between combustor pressure, fuel/air mixing, and the flame. In: 4th Joint Meeting of the U.S. Sections of the Combustion Institute, March 22, 2005, Philadelphia, PA.

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Fuel-air mixing behavior under the influence of imposed acoustic oscillations has been studied by investigating the response of the fuel mixture fraction field. The distribution of local fuel mixture fraction inside the mixing zone, which is expected to evolve into the local equivalence ratio in the flame zone, is closely coupled to unstable and oscillatory flame behavior. The Experiment was performed with an aerodynamically-stabilized non-premixed burner. In this study, acoustic oscillations were imposed at 22, 27, 32, 37, and 55Hz. Phase-resolved acetone PLIF was used to image the flow field of both isothermal and reacting flow cases and this data along with the derived quantities of temporal and spatial unmixedness were employed for analysis. The behavior of the unmixedness factor is compared with the previous measurements of oscillations in the flame zone. This comparison shows that local oscillations (of order millimeters or smaller) in fuel/air mixing are closely related to the oscillatory behavior of the flame. For each driving frequency, the mixture fraction oscillates at that frequency but with a slight phase difference between it and the pressure field/flame intensity, indicating that the fuel mixture fraction oscillation are likely the major reason for oscillatory behaviors of this category of flames and combustor geometry.

Item Type:Conference or Workshop Item (Paper)
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Additional Information:© This work was supported in part by the California Institute of Technology and partly by the Air Force Office of Scientific Research (AFOSR) under Grant No. F49620- 03-1-0384 (Dr. Mitat Birkan, Program Manager). We also acknowledge the assistance of Carlos Pinedo for the experimental set-up.
Group:Guggenheim Jet Propulsion Center, GALCIT
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Air Force Office of Scientific Research (AFOSR)F49620-03-1-0384
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Guggenheim Jet Propulsion Center UNSPECIFIED
Record Number:CaltechAUTHORS:20110125-074002108
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:21873
Deposited By: Ruth Sustaita
Deposited On:09 Feb 2011 18:19
Last Modified:03 Oct 2019 02:30

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