Relative effects of buoyancy and momentum on the characteristics of horizontally oriented circular (Circ) and elliptic (E) burner flames in a quiescent environment over a wide range of jet exit velocities are presented. The major axis of the elliptic burner was oriented horizontally and vertically (referred to as and flames, respectively). Propane was used as fuel and a small amount of hydrogen was piloted to attach flames to the burner. Global flame characteristics such as flame dimensions, centerline trajectory, emission indices (EI) and radiative fraction, and in-flame transverse concentration and temperature profiles were measured. At a jet exit Reynolds number of 2000, based on the area-equivalent diameter of the burner, the flame characteristics were affected by the burner geometry and its orientation. Also, the vertical dimension of the burner exit dictated buoyancy effects. At , the influence of burner geometry or its orientation was negligible. Elliptic burner flames exhibited lower liftoff and blowout velocities than circular burner flames. Furthermore, the flame stability and nitric oxide emissions were not much affected by the orientation of elliptic burner. Although the elliptic burners produced higher at lower jet exit velocities, the variation in among three burners (Circ, , and ) was insignificant at higher velocities. Some effects of buoyancy on were observed at lower jet exit velocities and the was the lowest for the burners with largest buoyancy flux. Elliptic burner flames produced greater peak flame temperature than the corresponding circular burner flames under most conditions.
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December 2006
Research Papers
Trajectory and Characteristics of Buoyancy and Momentum Dominated Horizontal Jet Flames From Circular and Elliptic Burners
Tracy Smith
Tracy Smith received her B.S. in Aerospace Engineering and M.S. in Mechanical Engineering from the University of Oklahoma in 1993 and 2004. During the past , she has worked for the Department of Defense, most recently for the U.S. Air Force as a propulsion engineer. Her specialty is repair processes for turbomachinery with a secondary focus on mishap investigation. Her research focused on combustion. She is a member of several professional and civic organizations.
Tracy Smith
Graduate Research Assistant
Combustion and Flame Dynamics Laboratory, School of Aerospace and Mechanical Engineering,
The University of Oklahoma
, Norman, OK 73019
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Chendhil Periasamy
Chendhil Periasamy received his B.E. (1998) and M.S. (2001) in Mechanical Engineering from Anna University and Indian Institute of Technology Madras, Chennai, India. He joined the Combustion and Flame Dynamics Laboratory at the University of Oklahoma for his Ph.D. degree in Fall 2002. His primary interests are in combustion. He is currently working on the evaporation and combustion aspects of liquid fuels in porous media.
Chendhil Periasamy
Graduate Research Assistant
Combustion and Flame Dynamics Laboratory, School of Aerospace and Mechanical Engineering,
The University of Oklahoma
, Norman, OK 73019
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Benjamin Baird
Benjamin Baird holds B.S. (1997) and Ph.D. (2005) degrees in Aerospace Engineering from the University of Oklahoma Norman. He was named as an outstanding student in the AIAA southwest region in 1997. He has conducted research on the effects of ellipticity on premixed flames for his dissertation. Although Ben’s primary research area is combustion, he is also interested in aerodynamics and computational fluid dynamics. Dr. Baird is currently employed with Precision Combustion Inc., North Haven, CT.
Benjamin Baird
Graduate Research Assistant
Combustion and Flame Dynamics Laboratory, School of Aerospace and Mechanical Engineering,
The University of Oklahoma
, Norman, OK 73019
Search for other works by this author on:
Tracy Smith
Tracy Smith received her B.S. in Aerospace Engineering and M.S. in Mechanical Engineering from the University of Oklahoma in 1993 and 2004. During the past , she has worked for the Department of Defense, most recently for the U.S. Air Force as a propulsion engineer. Her specialty is repair processes for turbomachinery with a secondary focus on mishap investigation. Her research focused on combustion. She is a member of several professional and civic organizations.
Chendhil Periasamy
Chendhil Periasamy received his B.E. (1998) and M.S. (2001) in Mechanical Engineering from Anna University and Indian Institute of Technology Madras, Chennai, India. He joined the Combustion and Flame Dynamics Laboratory at the University of Oklahoma for his Ph.D. degree in Fall 2002. His primary interests are in combustion. He is currently working on the evaporation and combustion aspects of liquid fuels in porous media.
Benjamin Baird
Benjamin Baird holds B.S. (1997) and Ph.D. (2005) degrees in Aerospace Engineering from the University of Oklahoma Norman. He was named as an outstanding student in the AIAA southwest region in 1997. He has conducted research on the effects of ellipticity on premixed flames for his dissertation. Although Ben’s primary research area is combustion, he is also interested in aerodynamics and computational fluid dynamics. Dr. Baird is currently employed with Precision Combustion Inc., North Haven, CT.
J. Energy Resour. Technol. Dec 2006, 128(4): 300-310 (11 pages)
Published Online: October 21, 2005
Article history
Received:
July 12, 2005
Revised:
October 21, 2005
