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利用多孔狭缝喷嘴考察了不同壁面条件对平行平板间甲烷/空气预混火焰熄火的影响规律,并采用表面分析手段探讨了不同材料对熄火特性的影响因素。实验结果表明壁面温度和表面特性都会影响熄火特性,熄火间距随着壁面温度的升高而单调减小,材料不同时熄火间距的差别在低温和高温时较小,在壁温为400℃时最大。化学熄火效应与表面化学吸附的OH基团有一定关联,即壁温相同时,表面的化学吸附氧越多,熄火间距就越小,反之亦然。
The effects of different wall conditions on the methane / air pre-flame flame-out between parallel plates were investigated by using porous slit nozzles. The influencing factors on the flameout characteristics of different materials were discussed by surface analysis. The experimental results show that the wall temperature and the surface properties all affect the flameout characteristics. The flameout distance decreases monotonically with the increase of the wall temperature. The difference of the flameout distances at different time points is smaller at low temperature and high temperature, . Chemical flameout effect and surface chemical adsorption of OH groups have a certain relationship, that is, the same wall temperature, the surface of the chemical adsorption of oxygen, flameout spacing is smaller, and vice versa.