단일액적의 연소에서 비회색체 복사에 관한 연구

Abstract

The purpose of this paper is mainly the comparison of radiation effect using nongrey model by analyzing method with that using grey model in droplet cumbustion. The discrete ordinate method (DOM) was employed to solve the radiative transfer equation (RTE)and the weighted sum of grey gases model (WSGGM) was applied to model a nongrey radiation effect by C02 and H20 gases. In the present study, nongrey effects were clearly appeared respectly. To present nongrey effects, many parametric studies were carried out. The result was shown that the ignition delay time became shorter, the radiative heat flux from gaseous medium to droplet increased, the flame became thinner, and combustion products decreased than grey model. This indicated the grey model was underestimated in radiationprocesses. So, nongrey model must be considered in any combustion phenomena.