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RISS 인기검색어
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- 저자 : 최기림(Kee Lim Choi) (검색결과 2 건)
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유근종(Geun Jong Yoo),최훈기(Hoon Ki Choi),최기림(Kee Lim Choi),신병주(Byeong Ju Shin) 대한기계학회 2009 大韓機械學會論文集B Vol.33 No.7
Configuration of the inlet transition square duct (hereinafter referred to as "transition duct") for heat recovery steam generator (hereinafter referred to as "HRSG") in combined cycle power plant is limited by the construction type of HRSG and plant site condition. The main purpose of the present study is to analyze the effect of a variation in turbulent flow pattern by roof slop angle change of transition duct for horizontal HRSG, which is influencing heat flux in heat transfer structure to the finned tube bank. In this study, a computational fluid dynamics(CFD) is applied to predict turbulent flow pattern and comparisons are made to 1/12th scale cold model test data for verification. Re-normalization group theory (RNG) based k-ε turbulent model, which improves the accuracy for rapidly strained flow and swirling flow in comparison with standard k-ε model, is used for the results cited in this study. To reduce the amount of computer resources required for modeling the finned tube bank, a porous media model is used.
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안내덕트 내부 난류유동구조에 따른 열전달 특성변화 수치해석
유근종(Geun Jong Yoo),최훈기(Hoon Ki Choi),최기림(Kee Lim Choi) 대한기계학회 2011 大韓機械學會論文集B Vol.35 No.9
본 연구에서는 복합화력발전소 가스터빈 출구가스 안내덕트 내부의 가스유동장이 배열회수보일러 전열기구에 미치는 영향을 CFD기법을 이용하여 분석하였다. 안내덕트 내부 난류흐름의 경우, 유속의 편차가 크고 선회 효과 및 상승류 현상이 심한 특징을 가지고 있음으로 이와 같은 유동의 수치해석을 위해 2개 방정식 난류점성 모델 중 RNG k-? 모델을 사용하였으며 유동장의 영향을 가장 많이 받는 배열 회수보일러 최종과열기관의 열전달특성변화를 파악하기위하여 NTU 방식을 이용한 수치해석결과와, 산업계에서 적용하는 설계기법에 의한 결과를 비교하였다. Because of the instability of a flow pattern in the inlet transition square duct (hereinafter referred to as “transition duct”) of a heat recovery steam generator (hereinafter referred to as “HRSG”) in a combined cycle power plant, the Reynolds number in the first row of a tube bank is differs sharply from that in the sectional area of the transition duct. This causes differences in the heat flux in each tube in the tube bank. The computational fluid dynamics (CFD) predictions provide three-dimensional results for velocity, temperature, and other flow parameters over the entire domain of the duct and HRSG. A renormalization group theory (RNG) based k-? turbulent model is used for obtaining the results cited in this study. A porous media option is used for modeling the tube banks and the number of transfer units method is used for determining the heat transfer characteristics. This study describes a comparison between the numerical simulation results and actual design output.
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