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RESEARCH PAPERS

Trajectory and Characteristics of Buoyancy and Momentum Dominated Horizontal Jet Flames From Circular and Elliptic Burners

[+] Author and Article Information
Tracy Smith

Combustion and Flame Dynamics Laboratory, School of Aerospace and Mechanical Engineering, The University of Oklahoma, Norman, OK 73019gollahal@ou.edu

Chendhil Periasamy

Combustion and Flame Dynamics Laboratory, School of Aerospace and Mechanical Engineering, The University of Oklahoma, Norman, OK 73019gollahal@ou.edu

Benjamin Baird

Combustion and Flame Dynamics Laboratory, School of Aerospace and Mechanical Engineering, The University of Oklahoma, Norman, OK 73019gollahal@ou.edu

S. R. Gollahalli

Combustion and Flame Dynamics Laboratory, School of Aerospace and Mechanical Engineering, The University of Oklahoma, Norman, OK 73019gollahal@ou.edu

J. Energy Resour. Technol 128(4), 300-310 (Oct 21, 2005) (11 pages) doi:10.1115/1.2358145 History: Received July 12, 2005; Revised October 21, 2005

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 Emaj and Emin 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 (Rej) 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 Rej=12,500, 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 EINO at lower jet exit velocities, the variation in EINO among three burners (Circ, Emaj, and Emin) was insignificant at higher velocities. Some effects of buoyancy on EICO were observed at lower jet exit velocities and the EICO 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.

FIGURES IN THIS ARTICLE
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Copyright © 2006 by American Society of Mechanical Engineers
Topics: Flames , Emissions , Buoyancy
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Figures

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Figure 1

Schematic diagram of experimental setup

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Figure 2

Cross-section geometry of circular and elliptic propane tube burners with sheathed, non-premixed hydrogen pilot flame burner (tubes were beveled at 45deg to form sharp edges at the exit)

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Figure 3

Typical propane horizontal diffusion flames from circular and elliptic burners with a 5% by mass hydrogen pilot flame

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Figure 4

Stability of propane horizontal diffusion flames from circular and elliptic burners

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Figure 5

Schematic of propane horizontal diffusion flame showing dimensional characteristics

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Figure 6

Projected height, length, width, and trajectory length of propane horizontal diffusion flames with a 5% by mass hydrogen pilot flame normalized by the buoyancy-influencing vertical dimension at various jet exit velocities for circular and elliptic burners

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Figure 7

Propane horizontal diffusion flame trajectories at varying jet exit Reynolds number and jet exit velocity, Uj(u∞=0.35Q̇1∕5)

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Figure 8

Radiative fraction of heat release in horizontal propane diffusion flames from circular and elliptic burners

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Figure 9

Global NO emission index for propane horizontal diffusion flames from circular and elliptic burners at different jet exit velocities

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Figure 10

Transverse NO concentration profiles in turbulent propane diffusion flames from circular and elliptic burners along the y direction (Uj=57.38m∕s;Rej=12,500)

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Figure 11

Global CO emission index for propane horizontal diffusion flames from circular and elliptic burners at different jet exit velocities

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Figure 12

Transverse CO concentration profiles in turbulent propane diffusion flames from circular and elliptic burners along the y direction (Uj=57.38m∕s;Rej=12,500)

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Figure 13

Transverse temperature profiles in turbulent propane diffusion flames from circular and elliptic burners along the y direction (Uj=57.38m∕s;Rej=12,500)

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