微小型通道几何参数对甲烷燃烧的影响

Effects of Geometry of Micro-Channel on the Methane/Air Combustion

利用Fluent6.3对微小型通道内的甲烷空气预混燃烧及传热进行了数值研究,得到了矩形截面通道几何参数对燃烧性能的影响。结果表明,随着通道高度的增加,火焰前沿的位置不断向下游移动,并且沿通道中心线的温度分布梯度和反应速率不断降低。通道间距0.6 mm,壁厚从0.1 mm增加到0.2 mm时,壁面和反应后区域流体温度普遍下降;但当壁面厚度较大(≥0.3 mm)时,壁厚对流体及壁面温度的影响非常小。通道间距1.0 mm时,随着壁面厚度的增加,流体及壁面温度都越来越小。

A numerical study on methane/air combustion inside a microchannel was undertaken to in- vestigate the effects of geometry of microchannel on combustion characteristics. The simulation results show that the flame front shifts downstream and the distribution of temperature gradient and reaction rate decreases as the gap increases. When the gap of microchannel equals to 0.6 mm, the temperature of walls and fluid temperature in areas after flame both decrease with the walls thickness increase from 0.1 mm to 0.2 mm. Whereas, when the walls thickness is larger than 0.3 mm, it has a little effect on fluid and walls temperature as the walls thickness increases. When the gap of microchannel equals to 1.0 mm, the walls temperature and fluid temperature decrease with the increasing of walls thickness.