Effect of burner geometry on the blowout limits of jet diffusion flames in a co-flowing oxidizing stream

Book · Sun Dec 31 04:00:00 EST 1995

OSTI ID:163210

Papanikolaou, N; Wierzba, I ^[1]

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1. Univ. of Calgary, Alberta (Canada). Dept. of Mechanical Engineering

The effects of changes in the jet nozzle geometry, i.e., nozzle shape and lip thickness, on the blowout limits of jet diffusion flames in a co-flowing air stream were experimentally investigated for a range of co-flow air stream velocities. Circular and elongated circular nozzles of different axes ratios were employed. Preliminary results showed that nozzles with low major-to-minor axes ratios improved, while high ratios reduced, the blowout limit of attached flames compared with that for an equivalent circular nozzle. Nozzle geometry had no apparent influence on lifted flames. The effect of premixing a fuel with the surrounding air was also studied. Generally, the introduction of auxiliary fuel into the surrounding stream either increased or decreased the blowout limit depending on the type of flame stabilization mechanism prior to blowout. The stability mechanism of the flame was found to be a function of the co-flow stream velocity and the auxiliary fuel employed.

• OSTI ID: 163210
• Report Number(s): CONF-950116--; ISBN 0-7918-1289-8
• Country of Publication: United States
• Language: English

Related Subjects

03 NATURAL GAS
40 CHEMISTRY
BLOWOFF
COCOMBUSTION
COMBUSTION INSTABILITY
COMBUSTION KINETICS
DESIGN
ETHYLENE
EXPERIMENTAL DATA
FLAMES
GAS BURNERS
GAS FURNACES
GAS TURBINE ENGINES
HYDROGEN FUELS
LIMITING VALUES
METHANE
PROPANE