微通道粗糙度对甲烷催化燃烧影响的数值研究

Numerical Study of the Micro-Channel Rough Surface on Methane Catalytic Combustion

采用详细化学反应机理对甲烷空气预混气体在不同粗糙度下微通道内催化燃烧进行了数值模拟。结果表明:粗糙度的存在使得微通道内甲烷转化率减小,出口温度降低,粗糙表面将阻碍催化反应的进行,而且粗糙度越大这种阻碍作用越大;在同一粗糙度下,随着当量比、混合气入口速度的增加,粗糙度对催化反应的阻碍作用越明显,粗糙度越大,燃烧效率越低。

This numerical study uses detailed chemical reaction mechanism for the catalytic combustion of the methane/air premixed gas under different rough micro-channel surface.The results show:the rough surface will reduce conversion rate of the methane,and the temperature of the outlet is decrease.The rough surface will block the catalysis combustion,and the block effect will be enhanced by the increasing surface roughness.Under the same surface roughness,with the increase of the equivalent ratio and the inlet velocity,the rough surface will hinder the catalysis combustion,and the hindrance effect will be more obvious by the equivalent ratio and the inlet velocity increasing.The larger surface roughness follows the lower efficiency.