Abstract
The chemical quenching effect of metal wall surface on a methane-air premixed flame formed in narrow quartz channel is investigated. In order to eliminate oxidation of the metal surface and to establish equivalent thermal boundary condition with different wall materials, SUS321 and inconel600 thin films are deposited on the quartz plates by using vacuum arc plasma gun. OH-PLIF and numerical simulation are employed to examine the near-wall flame structure. It is found that OH concentration near the metal surface is significantly lower than that near the quartz surface. The initial sticking coefficients associated with radical adsorption for the metal and the quartz surfaces are estimated to be 0.1 and 0.01, respectively.
