http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
회전익 채널내 후류장에 의한 비정상 유동특성에 관한 연구
김윤제,전용렬,Kim, Youn J.,Jeon, Y.-R 한국유체기계학회 1999 한국유체기계학회 논문집 Vol.2 No.4
The characteristic of unsteady flowfields on gas turbine, particularly on a rotor blade surface has been numerically investigated. The unsteady flow in a rotor blade passage as a result of wake/blade interaction is modeled by the inviscid flow approach, and solved by Euler equations using a time accurate marching scheme. Unsteady flow in the blade passage is induced by periodically moving a wake model across the passage inlet. The wake model used in this study is the Gaussian wate model in which the wake flow is assumed to be parallel with uniform static pressure and uniform relative total enthalpy. Numerical results show that for the case of Ps/Pr=1.5, the velocity and pressure distribution on the blade surfaces have much more complex profiles than for the case of Ps/Pr=1.0.
이종철(J. -C. Lee),김태윤(T. Y. Kim),김홍규(H. K. Kim),김윤제(Y. -J. Kim) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.11
The high-voltage circuit breaker plays an important role in the electrical system because there has been a need for suitable switching devices capable of initiating and interrupting the flow of the electric current. It continues as the contacts recede from each other and as the newly created gap is bridged by a plasma. The arc plasma happens inside the insulation nozzle of SF6 self-blast interrupter which is newly developed as the next-generation switching principle. The ablation of PTFE nozzle is caused by this high temperature medium, the PTFE vapor generated flows toward the outlets and the pressure chamber. This PTFE vapor makes the pressure inside the compression chamber increase. Because the rate of ablation depends on the magnitude of applied current, it decreases when the current goes to zero. The compressed gas inside the chamber flows reversely toward the arc plasma during this moment. According to this principle, the arc can be cooled down and the fault current can be interrupted successfully. In this study, we investigate numerically the relationship between the rate of ablation on the surface of PTFE nozzle and the pressure-rise inside the chamber. From the results near current zero such as the temperature of arc plasma and the characteristics of thermal-flow, we might predict the success or not of switching performance of the interrupter.
매니폴드 노즐 형상변화가 웨이퍼 캐리어 내부 유동특성에 미치는 영향
정문기(M.K. Jung),강병화(B.H. Kang),강현영(H.Y. Kang),양연희(Y.H. Yang),김요환(Y.H. Kim),김윤제(Y.J. Kim) 대한기계학회 2018 대한기계학회 춘추학술대회 Vol.2018 No.12
Wafer carrier is important equipment in semiconductor manufacturing processes which is used to remove contaminants from wafers by purging gas. However, having a uniform purging gas is difficult because the purging gas inlet in the wafer carrier is located at the lower left of the carrier. As a result, uneven flow patterns are formed inside the carrier, so that contamination of the wafer can not be smoothly removed. The numerical analysis was conducted to investigate the effect of manifold nozzle shape change on the flow characteristics of a wafer carrier using ANSYS Fluent 18.1. The turbulence kinetic energy and velocity distributions are investigated to obtain the most efficient aspect ratio of the nozzle(η).
후류장에 의한 가스터빈 회전익 통로내 비정상 유동의 수치해석적 연구
김윤제(Youn J. Kim),전용렬(Y. R. Jeon) 한국유체기계학회 1998 유체기계 연구개발 발표회 논문집 Vol.- No.-
The effects of unsteady flow on gas turbine, particularly on a rotor blade surface are numerically investigated. The unsteady flow in a rotor blade passage as a result of wake/blade interaction is modeled by the inviscid flow approach, and solved by the Euler equations using a time accurate marching scheme. Numerical results show that for the case of Ps/Pr=1.5, the velocity and pressure distribution on the blade surfaces have much more complex profiles than those of Ps/Pr=1.0.