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강승규,윤준용,이도형,Kang, Seung-Kyu,Yoon, Joon-Yong,Lee, Do-Hyung 대한기계학회 2002 大韓機械學會論文集B Vol.26 No.6
A numerical analysis of turbulent gas-particle two-phase flow is performed in conjunction with the experiments of Fackrell & Robins and Raupach & Legg that considered ground-level source and/or elevated source flat plate flow. K-$\omega$ turbulence model is used in order to analyze fully turbulent flow field and the concentration equation with settling velocity is adopted for the concentration field. The model of Einstein and Chien is applied that couples the velocity field and the concentration field. Turbulent eddy viscosity is re-evaluated in this model. The present numerical results have good agreement between the simulation and the experimental data for the mean flow velocities and particle concentrations. While the previous study shows about 27% error in the vicinity of the source of particle concentration, the .present study allows about 14% error. A new turbulent gas-particle flow model developed by this study is able to cut down error by 13% at a near source.
강승규(Kang Seung Kyu),최경석(Choi Kyung Suhk),오정석(Oh Jeong Seok) 한국에너지학회 2008 한국에너지공학회 학술발표회 Vol.2008 No.-
In the last five years, 45 people died and 104 were wounded because of carbon monoxide poisoning accident. CO poisoning accident is higher than any other gas accident in the rate of deaths/incidents. Most of these CO poisoning accidents were caused by defective exhaust tube in the old gas boiler and multi-use facility. In this study, the spread of CO gas released from leakage hole of exhaust tube was analyzed by concentration measuring test. CO gas leaked form exhaust tube in a building was highest concentrated near the ceiling. Through these experiments, the reasonable installation location of CO alarm was made certain and suggested.
저 NOx용 2단 열교환기가 장착된 가정용 보일러 연소실의 열전달 및 유동 수치해석
강승규(Seung-Kyu Kang),최경석(Kyung-Suhk Choi),윤준용(Joon-Yong Yoon) 한국유체기계학회 2008 유체기계 연구개발 발표회 논문집 Vol.2008 No.-
In this work, a numerical investigation is performed for the combustion chamber of domestic gas boiler with 1-stage and 2-stage heat exchanger. The fluid flow and heat transfer performance is provided with a structure change of heat exchanger. The numerical solution shows that, compared to the 1-stage heat exchanger, the increase in the heat transfer in the 2-stage heat exchanger is higher than that of the pressure loss, which proves the excellent performance of this 2-stage heat exchanger. The temperature of combustion chamber with 2-stage heat exchanger is lower than that of 1-stage. This effect reduces thermal NOx with decrease of high temperature staying time of the combustion gas.