Shapes of buoyant and nonbuoyant laminar jet diffusion flames

Journal Article · Sun Jan 31 23:00:00 EST 1999 · Combustion and Flame

DOI:https://doi.org/10.1016/S0010-2180(98)00045-5· OSTI ID:675664

Sunderland, P B ^[1]; Mendelson, B J ^[2]; Yuan, Z G ^[3]; Urban, D L ^[4]

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1. National Research Council, Cleveland, OH (United States)
2. Princeton Univ., NJ (United States). Dept. of Mechanical and Aerospace Engineering
3. National Center for Microgravity Research, Cleveland, OH (United States)
4. NASA Lewis Research Center, Cleveland, OH (United States)

Flame shapes were measured for buoyant and nonbuoyant laminar gas jet diffusion flames burning, methane, ethane, and propane in quiescent air. Test conditions involved burner diameters of 0.19--5.5 mm, ambient pressures of 0.25--2 atm, and fuel flowrates of 0.04--4.6 mg/s. Care was taken to minimize interference from soot emissions and from ignition disturbances. Microgravity conditions were obtained in the 2.2-s drop tower at the NASA Lewis Research Center. Normalized lengths of both buoyant and nonbuoyant flames were proportional to source Reynolds number, but the nonbuoyant flames were 40% longer on average. Normalized widths of the nonbuoyant flames were constant for Re {ge} 100, whereas buoyant flame widths scaled with source Froude number. Several nonbuoyant flame models are evaluated with the present shape data.

• OSTI ID: 675664
• Journal Information: Combustion and Flame, Journal Name: Combustion and Flame Journal Issue: 3 Vol. 116; ISSN CBFMAO; ISSN 0010-2180
• Country of Publication: United States
• Language: English

Related Subjects

03 NATURAL GAS
COMBUSTION KINETICS
FLAMES
LAMINAR FLOW
METHANE
MORPHOLOGY
PROPANE