제트확산화염에 대한 FDS 연소모델의 예측성능 비교 연구

Abstract

A prediction performance of Fire Dynamics Simulator (FDS) developed by NIST for the diffusion flame structure was validated with experimental results of a laminar slot jet diffusion flame. Two mixture fraction combustion models and two finite chemistry combustion models were used in the FDS for the simulation of the jet diffusion flame structure. In order to enhance the prediction performance of flame structure, DNS and radiation model was applied to the simulation. The reaction rates of the finite chemistry combustion models were appropriately adjusted to the diffusion flame. The mixture fraction combustion model predicted the diffusion flame structure reasonably. A 1-step finite chemistry combustion model cannot predict the flame structure well, but the simulation results of a 2-step model were in good agreement with those of experiment except CO2 concentration. It was identified that the 2-step model can be used in the investigation of flame suppression limit with further adjustment of reaction rates.