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SOFA 분사각의 온도 및 NOx 분포 영향에 관한 수치적 연구
배이석(Yee Seok Bae),유근종(Geun Jong Yoo),최훈기(Hoon Ki Choi),김용성(Yong Sung Kim),강승규(Sung Gju Kang),김동길(Dong Kil Kim) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.5
In tangential coal fired boiler, secondary over-fired air (SOFA) is provided to have uniform gas temperature and low NOx level. The temperature uniformity is affected by SOFA injection angle. Numerical analysis is performed to assess effect of SOFA injection angle on temperature and NOx distribution using finite volume method. The standard k-ε model is adopted for turbulence model along with P-1 model for radiation analysis and finite rate reaction model for combustion model. Analysis results show direct effect of SOFA injection angle on temperature and NOx distribution. Among different injection angle, the case with 4° in counter-clockwise direction shows better temperature uniformity and lower NOx level.
배이석(Yee Seok Bae),유근종(Geun Jong Yoo),최훈기(Hoon Ki Choi) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.5
In engine room, a good enclosure system is necessary for reducing noise but installing enclosure system in engine room cause a bad influence upon the cooling performance because of poor ventilation. The cooling efficiency of enclosure system can be improved by changing speed of fan and flow path for ventilation of engine room. In this study, numerical analysis is performed to assess cooling effect of enclosure system using finite volume method. The RNG k-ε model is adopted for turbulence model along with heat exchanger model and porous media model for heat exchanger analysis and moving reference frame model for rotational fan. Cold flow analysis result proves reasonable agreement with experimental data. Analysis results show direct effect of velocity and temperature distribution on cooling ability of enclosure system. Compare with the engine room which has no enclosure system, the case with total enclosure system which has box hole flow path and 1570rpm of fan speed shows the proper cooling capacity.