Effects of Flame Lift-Off on the Differences Between the Diffusion Flames From Circular and Elliptic Burners

[+] Author and Article Information
S. R. Gollahalli

School of Aerospace and Mechanical Engineering, The University of Oklahoma, 865 Asp Avenue, Room 212, Norman, OK 73019-0601

J. Energy Resour. Technol 120(2), 161-166 (Jun 01, 1998) (6 pages) doi:10.1115/1.2795028 History: Received March 15, 1996; Revised November 21, 1997; Online November 06, 2007


An experimental study conducted to determine the effects of lifting the flame base off the burner rim on the differences between the flame characteristics of diffusion flames from circular and elliptic burners is presented. The in-flame profiles of temperature, concentrations of fuel and combustion product species, and the mean and fluctuating components of axial velocity are presented. This study has shown that the effects of burner geometry in turbulent lifted flames are considerable only in the near-burner region. In the midflame and far-burner regions, the effects traceable to burner geometry are much weaker, contrary to those observed in the attached flame configuration. The observations are attributed to the turbulence and additional air entrainment into the jet prior to the flame base accompanying the lift-off process, which mitigate the effects of burner geometry.

Copyright © 1998 by The American Society of Mechanical Engineers
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