Stabilization of premixed flames in mixed-convection laminar plumes

✍ Scribed by M.-M. Yan; G.M. Faeth

• Publisher: Elsevier Science
• Year: 1986
• Tongue: English
• Weight: 903 KB
• Volume: 63
• Category: Article
• ISSN: 0010-2180
• DOI: 10.1016/0010-2180(86)90107-0

✦ Synopsis

A theoretical and experimental study of laminar premixed flames stabilized in a two-dimensional mixedconvection thermal plume is described. Tests were conducted with a uniform upflow (velocities in the range 7-20 cm/s) of lean methane-air mixtures (fuel equivalence ratios in the range 0.44-0.56) past a heated horizontal wire (wire diameters in the range 142-320 #m). Wire Reynolds numbers were low; therefore, recirculation zones behind the wires were absent and the flames were thermally stabilized. Flame standoffdistances from the wire, blowoff limits, and shapes were measured and correlated using earlier boundary layer analysis. Blowoff limits were associated with the rapid transition from flame positions near to far from the source, posed earlier as a wake/plume ignition criterion. Effects of streamwise diffusion were observed; therefore, subsequent analysis should relax the boundary layer approximations.