Visualizing Diffusion Flame Formation in the Wake of Partially Premixed Combustion

[+] Author and Article Information
K. M. Lyons, K. A. Watson

Department of Mechanical and Aerospace Engineering, North Carolina State University, Raleigh, NC 27695-7910

J. Energy Resour. Technol 123(3), 221-227 (Mar 02, 2001) (7 pages) doi:10.1115/1.1385518 History: Received February 02, 2000; Revised March 02, 2001
Copyright © 2001 by ASME
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Simultaneous CH fluorescence (left) and Rayleigh scattering (right) images. (a) and (b) show diffuse gradients in the Rayleigh signal intensity across the leading edge of the hot zones with no observable CH leading edge structures. (c) and (d) show steep Rayleigh signal gradients with observable leading edge features.
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Schematic diagram of the partially premixed jet flame propagation under investigation
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Images of the propagation of combustion upstream (downward) toward the nozzle exit. The sequence commences (t=0) approximately 80 ms after ignition and the flame reaches the burner at approximately t=400 ms.
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Average calculated axial velocity distributions (m/s) of the jet fluid along with the corresponding flame images at t=0, 128, and 288 ms. This is the average jet velocity distribution that the propagating combustion front encounters as it reaches a particular axial position.
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Plot of the average axial location of the flame versus time during flame propagation. The data points correspond to the position of the leading edge of the flamefront during the 15 time steps included in Fig. 3.
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Plots of the axial upstream propagation velocity (laboratory reference flame) versus—(a) time, and (b) axial location
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Plot of the methane jet average axial velocities as a function of downstream axial location along (a) the jet centerline, and (b) the average stoichiometric contour
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Plot of the velocity of the flame relative to the average jet flow as a function of downstream axial location. The plot was arrived at by subtracting the average axial jet velocity at the stoichiometric contour from the observed upstream propagation velocity (laboratory reference frame).
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Flame luminosity images (t=0, 128, and 376 ms) along with the average stoichiometric contour. The three images correspond with the three regimes of combustion propagation.




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