Stabilization of lifted turbulent-jet flames

Journal Article · Sat Oct 01 04:00:00 EDT 1994 · Combustion and Flame; (United States)

DOI:https://doi.org/10.1016/0010-2180(94)90083-3· OSTI ID:6840732

Schefer, R W ^[1]; Namazian, M; Kelly, J ^[2]

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1. Sandia National Labs., Livermore, CA (United States). Combustion Research Facility
2. Altex Technologies Corp., Santa Clara, CA (United States)

Planar imaging measurement of CH, CH[sub 4], and temperature are used to evaluate current models for flame stabilization in lifted, turbulent CH[sub 4]-jet flames. The experimental system consists of two cameras that simultaneously record the instantaneous distributions of species concentration and temperature. Measurements were made in two flames with fuel-jet Reynolds numbers of 7,000 and 12,100. the results show that the fuel and air are premixed and within the CH[sub 4] flammability limits at the flame stabilization point. The flame zone also falls considerably outside the region where scalar dissipation is significant (dissipation levels are well below the critical value for extinction). It is concluded that local stoichiometry, and not scalar dissipation, is the primary factor controlling flame stability. Considerable interaction exists between the large-scale structure associated with the central fuel jet and the instantaneous flame zone, which is consistent with both premixed flame propagation and the concept of large-scale motion resulting in the ignition of unreacted fuel by hot combustion products.

• OSTI ID: 6840732
• Journal Information: Combustion and Flame; (United States), Journal Name: Combustion and Flame; (United States) Vol. 99:1; ISSN CBFMAO; ISSN 0010-2180
• Country of Publication: United States
• Language: English

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TURBULENT FLOW