Abstract
Flame/wall interactions in a duct-type crevice (simulated by two parallel walls) have been investigated by making Raman scattering measurements of the spatial temperature profile for a range of wall separations and flame stoichiometry. Experiments using both cold (isothermal) and hot (adiabatic) walls in an atmospheric pressure, premixed, propane/air flame show that, as the wall separation is reduced, opposite thermal boundary layers begin to interact. The effect is more severe for the leaner fuel mixtures where the flame speed has been reduced. Results with a hot wall show the reduced thermal layer thickness is associated with the flame front position moving closer to the wall.
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