超希薄旋回流予混合火炎の形状と構造に与えるルイス数の影響

抄録

It has been experimentally found that the flame shape of hydrogen, methane, propane swirling premixed lean flame are different. In this study, adiabatic numerical simulations of swirling lean methane premixed flames were carried out with the diffusion coefficient of methane set to thermal diffusivity weighted by the reciprocal of the Lewis number. As a result, it was found that when the Lewis number of fuel is lower than unity the flame shape is same as the methane flame in former studies. On the other hand, when the Lewis number of fuel higher than unity, the flame shape is same as propane. As a result, we concluded that the difference of the flame shape observed in our former studies is obviously due to the effect of Lewis number.