Ignition characteristics of premixed cool flames on a heated wall

This work examined the cool flame ignition and stabilization on heated walls with different surface reactivities. A premixed mixture of dimethyl ether (DME) O2 was impinged a wall temperature linearly ramped to determine temperature. Numerical analyses identify hysteresis phenomenon in extinction processes, which appears be primarily governed by low-temperature reaction kinetics. The formation HCHO during process monitored using planar laser-induced fluorescence (PLIF) technique synchronized instantaneous measurements. data indicated that concentration near abruptly increased at flame. predicted behaviors for nonlinear folded S-curve smoothly stretched were successfully observed experimentally first time ever lean mixtures. Moreover, results show compared limits an inert SiO2 surface, noticeable increases decreases Fe Pt surfaces, respectively. These findings suggest significant chemical effects occur process, based interactions between gas phase reactions.