Abstract
This paper presents (1) the development of optical measurement system of near-wall OH^* concentration in order to investigate the flame quenching mechanism in ultra-thin chamber; and (2) observation and analysis of premixed CH_4/Air flame propagation and quenching in three quartz combustors with chamber depth of 0.7mm, 1.0mm and 1.5mm, respectively. It is found that the quenching distance for heated quartz wall can be smaller than 0.7mm, and is dependant on the wall temperature. Flammability limits are obtained for different equivalence ratios and mixture velocities.
