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Int J Fire Sci Eng > Volume 31(4); 2017 > Article
Fire Science and Engineering 2017;31(4):35-42.
DOI: https://doi.org/10.7731/KIFSE.2017.31.4.035    Published online August 31, 2017.
백드래프트 현상의 LES를 위한 EDC 모델의 연소 화학반응기구 적합성 연구
디네쉬 마일사미, 오창보, 한용식, 도규형
1부경대학교 안전공학과
2부경대학교 안전공학과
3한국기계연구원 에너지플랜트안전연구실
4한국기계연구원 에너지플랜트안전연구실
A Study of the Suitability of Combustion Chemistry in the EDC Model for the LES of Backdraft
Myilsamy Dinesh, Oh Chang Bo, Han Yong Shik, Do Kyu Hyung
1Department of Safety Engineering, Pukyong National University
2Department of Safety Engineering, Pukyong National University
3Department of Energy Plant Safety Technology, Korea Institute of Machinery and Materials
4Department of Energy Plant Safety Technology, Korea Institute of Machinery and Materials
요약
구획실 내부의 고온 메탄연료에서 발생하는 백드래프트 현상에 대해 FDS v6를 이용한 LES를 수행하였다. EDC 연소모델을 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 연료특성에 맞는 화학반응기구의 적합성을 우선 검토하는 것이 필요함을 확인하였다.
Abstract
Large Eddy Simulation (LES) was peformed for the backdraft occurred in a compartment filled with high-temperature methane fuel using the Fire Dynamics Simulator (FDS) of version 6. The prediction performance of FDS, adopted the Eddy Dissipation Concept (EDC) combustion model with five different chemical reaction mechanisms, was evaluated. The temporal distributions of temperature, fuel mass fraction, velocity and pressure were discussed with numerical results and the pressure variation in time was compared with that of previous experiment. The FDS adopted the EDC model showed the possibility of LES for the backdraft phenomena. However, the prediction performance of the LES with EDC model strongly depended on the chemical reaction mechanism considered. It is necessary that the suitability of the chemical reaction mechanism should be validated in advance for LES with the FDS v6 to be applied to the simulation of backdraft.
Key Words: Backdraft, Fire Dynamics Simulator (FDS), Large Eddy Simulation (LES), Eddy Dissipation Concept (EDC) Model, Chemical Reaction Mechanism


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