Numerical analysis of a spray combustion with nongray radiation using weighted sum of gray gases model

Abstract

In this study, the effect of radiation has been considered in a liquid spray combustion chamber. The discrete ordinates method (DOM) was employed to solve the radiative transfer equation (RTE) and the weighted sum of gray gases model (WSGGM) was applied to model a nongray radiation effect by CO2 and H2O gases. The absorption coefficients derived from WSGGM were used with DOM by summing solutions of the RTE for each gray gas. Eulerian-Lagrangian scheme was adopted to alalyze the two phase combustion. The interactions between two phases are accounted for by using the particle source in cell (PSIC) model. The results have shown that the gasfication of the droplets is more quickly completed by radiation, which results in shorter droplet trajectories. The radiation also led to a broader high temperature zone inside the combustor. Therefore, it was found that the performance of the spray combustor was enhanced by the radiation effect.