http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
245㎸ 40㎄ Motor-drive형 초고압 GIS 개발
여창호(Chang-Ho Yeo),서경보(Kyoung-Bo Seo),김정배(Jeong-Bae Kim),권기영(Ki-Yeoung Kweon) 대한전기학회 2007 대한전기학회 학술대회 논문집 Vol.2007 No.11
This study is a development of 245kV 40kA GIS(Gas Insulated Switchgear) with motor-drive mechanism. The Ultra high voltage GIS applicates an interception technology of hybrid arc extinguishing method and Motor-Direct-Drive-Mechanism for operation type. We will develope a compact GIS for construction of an intelligent substation by an applicated IT technology.
여창호(Chang Ho Yeo),서용권(Yong Kwon Soh) 대한기계학회 2003 대한기계학회 춘추학술대회 Vol.2003 No.11
In this paper, we report the namerical dan experimental solutions of vortical flows driven by an impingement of fluid from the bottom wall of a cylinder. managed to visualize succesdfully the flow shown on the vertical plane through the container axis. The numerical results are shown to compere well with the experimental results for case of infinity Rossby number. The satisfaactory agreement netween the two results was possble when in the numeries the free surface was trcated as a solid wall so that a no-slip condition was appied on the surface. The namerical solutions revel that inertial oscillation play an important role at small Rossby numbers, or at a large background rotation.
수평 보텍스 링의 동적 특성 - 회전효과에 대한 실험 및 수치해석
여창호(Chang Ho Yeo),박재현(Jae Hyun Park),서용권(Yong Kweon Suh) 대한기계학회 2004 대한기계학회 춘추학술대회 Vol.2004 No.11
In this paper, we report the numerical and experimental solutions of the axi-symmetric flows in the axial plane driven by an impingement of fluid from the bottom wall of a circular cylinder. We managed to visualize successfully the flow pattern shown on the vertical plane through the container axis. The numerical results are not show to compare well with the experimental results for the case of the Rossby number 3. Because the numerical results calculate on the assumption that vortex flows are axi-symmetric flow on the other hand real experimental results are show asymmetric flow. The numerical solutions reveal that inertial oscillation plays an important role at small Rossby numbers, or at a larger background rotation.
국소적 격자 삽입법을 이용한 반 원주 내의 스핀업 유동에 대한 연구
여창호(Chang Ho Yeo),서용권(Yong Kweon Suh) 대한기계학회 2004 대한기계학회 춘추학술대회 Vol.2004 No.4
In this paper the numerical method with a zonal embedded grid system was applied to the spin-up flow within a semi-circular container. Flow visualization was also performed on a rotating table. The results show that at a low level of damping (i.e. low viscosity and high liquid depth) a cyclonic cell produced initially near the left-hand-side corner of the container moves along a wall and merged with the cell on the right-hand-side.
김진범(Jin-Bum Kim),여창호(Chang-Ho Yeo),서경보(Kyoung-Bo Seo),권기영(Ki-Yeoung Kweon),이학성(Hahk-Sung Lee) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.5
Self-blast circuit breakers utilize the energy dissipated by the arc itself to create the required conditions for arc quenching during the current zero. The high-current simulation provides information about the mixing process of the hot PTFE cloud with SF? gas which is difficult to access for measurement. But it is also hard to simulate flow phenomenon because the flow in interrupter with high current, SF?-PTFE mixture vapor and complex physical behavior including radiation, calculation of electric field. Using a commercial computational fluid dynamics(CFD) package, the conservation equation for the gas and temperature, velocity and electric fields within breaker can be solved. Results show good agreement between the predicted and measured pressure rise in the thermal chamber.
국소적 격자 삽입법을 이용한 반원주 내의 스핀업 유동 특성에 대한 연구
서용권(Yong Kweon Suh),여창호(Chang Ho Yeo) 한국가시화정보학회 2004 한국가시화정보학회지 Vol.2 No.2
In this paper the numerical method with a zonal embedded grid system for an incompressible flow within a semi-circular container is presented. The algorithm is validated by its application to some typical flow models including the spin-up flow inside a semi-circular geometry. Flow visualization for the spin-up flows was used by PIV. The results show that at high Reynolds numbers the cyclonic cell at the left-hand side region moves along the circular wall and merges with the cell at the right-hand side region.
서용권(Yong Kweon Suh),여창호(Chang Ho Yeo) 한국가시화정보학회 2004 한국가시화정보학회지 Vol.2 No.2
Theoretical and numerical studies are given to the sink flows within a rotating circular tank driven by the fluid withdrawal from a bottom circular hole. It was found that, when the upper free surface was set with no-slip boundary conditions, the Ekman boundary-layer develops not only above the bottom surface but under the top surface. The sink fluid is coming from the two Ekman layers, and the mass transfer from the bulk, inviscid region is dependent on the rotational speed. It is also remarkable to see that all the fluid gathered along the axis flows in a form of rapidly rotating fluid column having almost the same diameter as the bottom hole.