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이규명(Kui Ming Li),박영규(Young Kyu Park),정호윤(Ho Yun Jung),최윤환(Yoon Hwan Choi),이연원(Yeon Won Lee) 한국가시화정보학회 2010 한국가시화정보학회 학술발표대회 논문집 Vol.2010 No.11
The discharge properties of superhigh-pressure mercury lamp are due to resistance heating for the input energy, and results in temperature increase. The cooling equilibrium state is reached by heat conduction, convection and radiation. In order to predict the fluid flow and heat transfer around the mercury lamp accurately, Visualization of the mercury lamp is simulated by CFD program in this study. Here, three different arc model are used. Among these, when the third model is used the temperature distribution of which both inner fluid and glass cover are higher than others. It can be concluded that the shape of arc plays an important role that affects the fluid flow and heat transfer in mercury lamp.
파력 발전 시스템 설계를 위한 부유체 에너지 흡수에 관한 기초연구
이규명(Kui Ming Li),최윤환(Yoon Hwan Choi),이연원(Yeon Won Lee) 대한기계학회 2012 대한기계학회 춘추학술대회 Vol.2012 No.11
In order to design a wave energy generating system, a 6-DOF analysis technique is applied to the three-Dimensional CFD analysis on of a floating body and the behavior is interpreted according to the nature of the incoming wave. A wave period of 5.5s & amplitude of 0.57m from Marado is chosen. 12 cases have been modeled. It is compared to analyze the effects of energy absorption variables, namely mass moment of inertia, angular velocity and angular acceleration. From the results obtained, we conclude that model L is the maximum power absorbed 6㎾ approximately. A maximum pitch angle of 1.91 degree was attained by Model F, and the maximum displacement of nearly 0.7m was attained by Model L among models D, F and L.
엔진 시동용 공기터빈의 유로 변경에 대한 3차원 유동해석
이규명(Kui Ming Li),정호윤(Ho Yun Jung),최윤환(Yoon Hwan Choi),이연원(Yeon Won Lee) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.11
The marine medium-speed diesel engines are operated by two methods; one is the electric motors, and the other air starting motors. Air starting motor is dependent of the engine types and sizes, it has been widely used in this area due to its simplicity, convenience and reliability. However, most of them are currently imported from overseas due to lack of the cutting-edge technology in terms of design and manufacturing. So, there is a possibility to design a new type air starting motor to realize localization. In this paper the purpose is compare between two stage of original type and modified of a new type to study designing parameters in order to make a high performance Air Starting Motor. In this study, we've modeled two modified types, separately. The simulation was used by CFX program. It was compared with the different type under the same initial condition and boundary condition. It was concluded that the results of modified type in blade is better than traditional type.
펌프 섬프장 흡입 조건에 따른 자유표면 보텍스 변동에 관한 연구
박영규(Young Kyu Park),이규명(Kui Ming Li),최윤환(Yoon Hwan Choi),이연원(Yean Won Lee) 한국가시화정보학회 2011 한국가시화정보학회지 Vol.9 No.4
In this study the change of free surface vortex is represented at different times according to height of water and with or without curtain wall installation. The air volume fraction is investigated at each condition of water level and the influence about creation of vortex is analyzed. The height of sump intake is taken as 100mm and the water level is divided into 5 steps. The Sump model is the TSJ model and the curtain wall is applied by HI standard of America. The results shows that the free surface vortex can be identified on the isotropic surface at air volume fraction I %-5% and the vortices make an air column from the free surface to the sump intake and are created and destroyed repeatedly. In the higher water level, less air is absorbed into the intake pipe. After curtain wall installation, the suction rate of the air volume fraction is decreased by 6.7%. The result of the vortex motion according to time, works on a cycle.
펌프 섬프장내 자유표면 보텍스에 의한 공기흡입 현상의 가시화
박영규(Young Kyu Park),이규명(Kui. Ming. Li),최윤환(Yoon Hwan Choi),이연원(Yeon Won Lee) 한국가시화정보학회 2011 한국가시화정보학회지 Vol.9 No.3
?;?;In this study the change of free surface vortex is expressed through the time volume fraction using multiphase unsteady condition in sump, because in previous studies of the pump sump did not represent the behavior of the free surface vortex exactly due to the reason it was calculated using single phase and steady condition. The reliability of the computational analysis is verified through comparing experimental results with that of present numerical analysis. Homogeneous free surface model is used to apply interactions of air and water. The results show that the free surface vortex can be identified on the isotropic surface at air volume fraction 1%~5%. The vortices make an air column from the free surface to the sump intake and are created and destroyed repeatedly. The behavior of free surface vortex at numerical analysis is quite similar to experimental test. The result of vortex motion according to time, works on a cycle.