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이재성(Jae-Sung Lee),노경철(Kyoung-Chul Ro),권기영(Ki-Yeoung Kweon),이학성(Hahk-Sung Lee),이영호(Young-Ho Lee) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.5
Electric motor capacity highly depends on the temperature of core and coil. In order to design the cooling system, Inside flow characteristics are very important factors. In this study, three dimensional flow field analysis is performed computationally and the results are compared with PIV(Particle image velocimeter) measuring data. CFD simulation can be a very useful tool for the prediction of flow characteristics in a motor cooling system.
박상규(Sang-Gyoo Park),김진범(Jinbum Kim),권기영(Ki-Yeoung Kweon),이학성(Hahk-Sung Lee) 한국유체기계학회 2008 유체기계 연구개발 발표회 논문집 Vol.2008 No.-
This study describes aerodynamic characteristics for the HAWT (Horizontal Axis Wind Turbine) rotor blade using general CFD code. The aerodynamic analysis results are validated with the experimental result by the NREL (National Renewable Energy Laboratory)/NASA Ames wind tunnel test for S809 airfoil. In the case of wind turbine rotor blade. complex phenomena are appeared such as flow separation and re-attachment. Those are handled by using a commercial flow analysis tool. The 2-equation k-ω SST turbulence model and transition model appear to be well suited for the prediction. The 3-dimensional phenomena in the HAWT rotor blade is simulated by a commercial 3-D aerodynamic analysis tool. The optimal Tip Speed Ratio is predicted by using the GH Bladed which is a design tool for wind turbine.
김진범(Jin-Bum Kim),권기영(Ki-Yeoung Kweon),이학성(Hahk-Sung Lee) 한국유체기계학회 2006 유체기계 연구개발 발표회 논문집 Vol.- No.-
High-voltage auto-expansion circuit breakers utilize the ablation of polytetrafluoroethylene(PTFE) nozzle to produce adequate conditions for arc quenching at current zero. The high-current simulation provides information about the mixing process of the hot PTFE cloud with the SF? gas which is difficult to access for measurement. But it is also difficult to simulate flow phenomenon because the flow in interrupter with high current and SF?-PTFE mixture vapor, complex physical behavior including radiation. Using the PC based PHOENICS, a commercial computational fluid dynamics(CFD) package, the conservation equation for the gas and temperature, velocity and electric fields within breaker can be visualized and thermal interruption capability predicted. These numerical results will reduce the number of costly short-circuit test.
XML Web Service를 이용한 고장 데이터의 웹 전송과 웹으로 수신된 고장 데이터의 고장 유형 판별에 관한 연구
金仁秀(In-Su Kim),黃定基(Jung-Gi Hong),李學成(Hahk-Sung Lee) 대한전기학회 2006 전기학회논문지A Vol.55 No.1
Recently as the power system has been becoming massive and complicated, most of the faults bring on severe proliferation effects. Because of the complexity of the power system it is not easy to analyze faults-the calculation of current flows under fault conditions. Therefore many researches have been performed in this area. As a result of those efforts, the protective equipments for a power system have been designed to operate properly and without damage when the highest possible fault current is flowing in the power system. Most of the fault data can be also acquired from intelligent protection equipments. The fault data saved in them don't always include the fault type information. If you don't have knowledge about the fault analysis, it becomes useless. So this paper presents 3 topics to increase a reusability of them as followings. First, describes a fault data using the XML(eXtensible Markup Language). It would be a well-formed and valid document complied with suggested XML DTD(Document Type Definition). In this paper I suggest a standard DTD to describe the power system fault. If the XML document describes any power system faults is validated against suggested DTD, it is possible to be used in any applications. Second, sends them through the web using the XML web service. Last, presents the rapid and accurate algorithm for a fault type determination of the fault data received from the web. In the ultimate the client to request the server to analyze a fault data is provided the correct information what kind of fault is occurred.
한창우(Han, Chang-Woo),김현재(Kim, Hyun-Jae),권기영(Kweon, Ki-Yeoung),이학성(Lee, Hahk-Sung) 한국신재생에너지학회 2008 한국신재생에너지학회 학술대회논문집 Vol.2008 No.10
In this paper, the numerical analysis of the model without air-guide was carried out in wind power generator. From numerical results, the temperature rise was not satisfied for the class F insulation and the non-uniformity of temperature distribution was a wide difference in heating elements. To improve these problems, the air-guide was installed in front of the coil head of non-drive end(NDE). The short distance between coil head and air-guide was more effective than long distance in cooling performance. Compared to that of the preliminary design, it was found that the cooling performance of the modification design was improved about 12%.
PTFE 용삭을 고려한 초고압 복합소호 차단기의 열챔버 압력 특성 평가
김진범(Jin-Bum Kim),권기영(Ki-Yeoung Kweon),이학성(Hahk-Sung Lee) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.10
Self-blast circuit breakers utilize the energy dissipated by the arc itself to create the required conditions for arc quenching during the current zero. During the arcing period, high pressure, temperature and radiation of the arc could burn in pure SF6 gas and PTFE nozzle. Ablated nozzle shape and SF6-PTFE mixture vapor affect the performance of an self-blast circuit breaker. But it is hard to simulate the behavior of hot gas, prediction because of complex physical behavior including radiation, calculation of electric field. Using computational fluid dynamics, the conservation equation for the gas and temperature, velocity and electric fields within breaker can be solved. Performance of ablated nozzle shape are compared with original model.