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Combined acetone PLIF and IR laser absorption probe measurements of fuel mixture fraction oscillations

Kang, D. M. and Fernandez, V. and Ratner, A. and Culick, F. E. C. (2006) Combined acetone PLIF and IR laser absorption probe measurements of fuel mixture fraction oscillations. . http://resolver.caltech.edu/CaltechAUTHORS:20110208-092444615

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Abstract

Measurements of the spatial dependence of fuel mixture fraction are made for a non-premixed jet flame in a combustion chamber with imposed acoustic oscillations at frequencies of 22-55 Hz. As part of a set of studies on combustion instabilities and the dynamical behavior of combustion systems, this work is intended to provide a basic understanding of the characteristics of mixing under imposed acoustic oscillations. Infrared laser absorption and phase-resolved acetone PLIF are used to measure the fuel mixture fraction throughout the flow field. The degree of fuel/air mixing is then calculated from the measurements in terms of unmixedness factor, in both temporal and spatial respects. Results show that the acoustic excitation causes oscillations in fuel/air mixing at the driving frequency, which results in oscillatory flame behavior in the flame region. The unmixedness factors for the reacting flow cases exhibit greater overall magnitudes than the cold flow cases, which means that mixing becomes less effective in the presence of flame. Also the degree of mixing decreases with increasing frequency for reacting cases, while, for the cold flows, the mixing tends to be enhanced with frequency.


Item Type:Report or Paper (Working Paper)
Additional Information:Conditionally accepted by Experiments in Fluids, 2006. 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). The authors are grateful to the assistance of Carlos Pinedo for his help in the setting up of the experiments.
Group:Guggenheim Jet Propulsion Center
Funders:
Funding AgencyGrant Number
CaltechUNSPECIFIED
Air Force Office of Scientific Research (AFOSR)F49620-03-1-0384
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Other Numbering System NameOther Numbering System ID
Guggenheim Jet Propulsion Center UNSPECIFIED
Record Number:CaltechAUTHORS:20110208-092444615
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20110208-092444615
Official Citation:Kang, D. M., Fernandez, V., Ratner, A., and Culick, F. E. C., “Combined Acetone PLIF and IR Laser Absorption Probe Measurements of Fuel Mixture Fraction Oscillations,” Conditionally accepted by Experiments in Fluids, 2006.
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:22067
Collection:CaltechAUTHORS
Deposited By: Ruth Sustaita
Deposited On:09 Feb 2011 16:05
Last Modified:26 Dec 2012 12:54

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