Flame propagation across a liquid fuel in an air stream

  • Suzuki T
  • Hirano T
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The behavior of flames propagating across methanol in opposed and concurrent air streams was examined using high-speed schlieren photography, and the propagation mechanisms of these flames are discussed. For the free stream velocity U0, i.e., in the case of the concurrent air stream, Vf remains almost constant until U becomes equal to Vf0, and becomes nearly equal to U in the range of U>Vf0. In the case of UVf0, the flame propagation seems to be closely related to the behavior of the hot gas overhanging the methanol surface in fron of the leading edge of the flame. The heat from the overhanging hot gas is expected to increase the methanol vapor concentration in front of the leading flame edge and ignite it. Thus, an inclined flame can follow the hot gas even when the initial methanol temperature T1 is lower than that of the flash point. The relation (ρ{variant}u/ρ{variant}y)sc2=B·SL2·δ0 is found to be valid for T1>15°C, in which (ρ{variant}u/ρ{variant}y)scis the critical velocity gradient at the methanol surface in the approach flow, B a constant, SL the burning velocity at the leading flame edge, and δ0 the flammable layer thickness at U=0. © 1982 Combustion Institute.

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  • Takuji Suzuki

  • Toshisuke Hirano

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