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지선구(Seon-Koo Chee),박성관(Sung-Kwan Park) 한국유체기계학회 2001 유체기계 연구개발 발표회 논문집 Vol.- No.-
It is not easy to apply a small-sized centrifugal fan to the duct used for the thermal management of home electronic appliances due to complex design parameters of its blades and scroll. The main objective of this study was to develop the systematic process to design an optimal centrifugal fan based on the 3-dimensional configuration of blades obtained from the conceptual design program self-developed with the given design constraints such as the flow rate, the total pressure loss, the size of fan, and the number of rotation. The design process to find an optimal centrifugal fan for refrigerator was technologically linked in many ways. The complex grid generation system of the fan model included scroll was adopted for the numerical simulation. The FVM CFD code, FLUENT, was used to investigate the three dimensional flow pattern at the coordinate system of rotating frame and to check the optimal performance of the fan. By using this design process, a selected centrifugal fan was designed, numerically simulated, manufactured and experimentally tested in the wind tunnel. The performance curve of fan manufactured by NC process was compared with numerically obtained characteristic curve. The developed design method was proved into being excellent because these two curves were well matched.
방향성을 갖는 비정렬 삼각형격자를 이용한 단조 유선 Upwind 유한요소해석
지선구(Seon Koo CHEE),권장혁(Jang Hyuk KWON) 한국전산유체공학회 1997 한국전산유체공학회 학술대회논문집 Vol.1997 No.-
Rice's monotone streamline upwind finite element method, which was proposed to treat convection-dominated flows, is applied to the linear triangular element. An alignment technique of unstructured grids with given velocity fields is used to prevent the interpolation error produced iu evaluating the convection term in the upwind method. The alignment of grids is accomplished by optimizing a target function defined with the inner-product of a properly chosen side vector in the element with the velocity field. Two pure advection problems are considered to demonstrate the superiorities of the present approach in solving the convection-dominated flow on the unstructured grid. Solutions obtained with aligned grids are much closer to the exact solutions than those with initial regular grids. The capability of the present approach in predicting the appearance of the secondary vortex in the laminar confined jet impingement is shown by comparing streamlines to those produced by SIMPLE on a highly stretched grid toward the impingement plate.
사방 토출식 천장형 실내기의 냉기 토출 각도가 실내 온열 쾌적감에 미치는 영향
박성관(Sung Kwan Park),지선구(Seon Koo Chee),양근영(Geunyoung Yang),오상경(Sang Kyoung Oh) 대한기계학회 2001 대한기계학회 춘추학술대회 Vol.2001 No.9
It is necessary to develop the air control technique of air conditioning to make a comfort space in the occupancy zone through the detail analysis of temperature and flow inside room. This study concentrates on analysis of indoor thermal environment by controlling air guide system of indoor-unit installed in the ceiling of room. This paper studies how to increase the indoor comfort zone through the air control, and shows the guideline to design the efficient air guide duct of ceiling type. The indoor thermal and flow field are investigated both experimentally and numerically. Test apparatus simulating an air-conditioned room with the ceiling type indoor unit is made to measure the temperature and velocity profile. Commercial CFD code is used to understand the flow distribution and the optimal condition for discharge angle of cooling air. Computational results are analyzed and compared with the experimental result, and used for estimation of indoor thermal comfort index, e.g., PMV. The optimum discharge angle is about 40˚ for an air cooling in this study.
김성민(Sung-Min Kim),김윤제(Youn J. Kim),지선구(Seon-Koo Chee),박성관(Sung-Kwan Park) 대한기계학회 2002 대한기계학회 춘추학술대회 Vol.2002 No.5
Up to now, tile design of refrigerator duct was conducted by case study. In tile present study, we developed flow analysis program for optimal duct design. The advantage of this program is easily used to design duct. The solver of this program was programmed by using Hardy-Cross method. The commercial code, PHOENICS, was used for the computer simulation to compare the flow characteristics of cold air with developed program. The results show that the computed flow rate at the exit differs from the designed flow rate by a range of -46~15%. But, the validity of this program has been verified by checking the physical plausibility of the current results.