Abstract
구획실 내부의 고온 메탄연료에서 발생하는 백드래프트 현상에 대해 FDS v6를 이용한 LES를 수행하였다. EDC연소모델을 적용하였고 여기 필요한 화학반응기구에 대해서는 5가지를 검토하여 백드래프트에 대한 예측성능을 검토하였다. 구획실 내, 외부의 온도, 연료, 속도 및 압력분포에 대한 수치계산 결과고찰과 실험에서 얻어진 압력변화와의 비교를 수행하였다. FDS v6에서 기본적으로 제공하는 EDC 연소모델을 적용하면 LES 기법을 이용하여 백드래프트에 대한 수치계산이 가능함을 확인하였다. 그러나, 결합되는 화학반응기구에 따라서 백드래프트에 대한 예측성능이 큰 차이를 보였다. FDS에서 EDC 연소모델을 적용하여 백드래프트에 대한 LES를 수행할 경우에는 연료특성에맞는 화학반응기구의 적합성을 우선 검토하는 것이 필요함을 확인하였다.Large Eddy Simulation (LES) was peformed for the backdraft occurred in a compartment filled with high-temperaturemethane fuel using the Fire Dynamics Simulator (FDS) of version 6. The prediction performance of FDS, adopted the EddyDissipation Concept (EDC) combustion model with five different chemical reaction mechanisms, was evaluated. The temporaldistributions of temperature, fuel mass fraction, velocity and pressure were discussed with numerical results and the pressurevariation in time was compared with that of previous experiment. The FDS adopted the EDC model showed the possibilityof LES for the backdraft phenomena. However, the prediction performance of the LES with EDC model strongly dependedon the chemical reaction mechanism considered. It is necessary that the suitability of the chemical reaction mechanism shouldbe validated in advance for LES with the FDS v6 to be applied to the simulation of backdraft.
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