http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
윤순현,심재경,우창수,Yoon, Soon-Hyun,Sim, Jae-Kyung,Woo, Chang-Soo 대한기계학회 2000 大韓機械學會論文集B Vol.24 No.2
Thermochromic liquid crystal reflect a unique color at even temperature. Therefore, they have been successfully applied to non-intrusive heat transfer research. Hue capturing method is widely used in the quantitative measurement from the TLC image. However it is affected by several measurement conditions. The distances of camera and light source have little influence on the color, but the value of hue is seriously affected by the measurement angle. In this study, the hue capturing method is improved by considering the effect of measurement angle. This improved calibration method can diminish the misreading of temperature caused by curvature of test surface.
사각주 후류가 선형터빈익렬의 유동 및 열전달에 미치는 영향에 관한 연구
윤순현,심재경,우창수,이대희,Yoon, Soon Hyun,Sim, Jae Kyung,Woo, Chang Soo,Lee, Dae Hee 대한기계학회 1999 大韓機械學會論文集B Vol.23 No.7
An experimental study Is conducted in a four-vane linear cascade in order to examine the influence of the wake behind rectangular bars on the flow and heat transfer characteristics. Flow and heat transfer measurements are made for the inlet Reynolds number of 66000(based on chord length and free-stream velocity). Turbulent intensity and stress are measured using a hot-wire anemometer, and to measure the convective heat transfer coefficients on the blade surface liquid crystal/gold film Intrex technique is used. Each of experimental cases is characterized by the unsteadiness measured at the entrance of the cascade. The wake behind the rectangular bars enhances the turbulent motion of the flow in the cascade passage. It also promotes the boundary layer development and transition. The results show that heat transfer coefficients on the blade surface increase with increasing unsteadiness.
2차원 채널 충돌제트에서 난류강도의 변화에 대한 유동 및 열전달 특성
윤순현,김동건,김문경,Yoon, Soon Hyun,Kim, Dong Keon,Kim, Moon KyounK 대한기계학회 1999 大韓機械學會論文集B Vol.23 No.6
Experiments were conducted to investigate the effect of the initial turbulent intensity on the flow and heat transfer characteristics for a two-dimensional impinging jet. A square rod was installed at the nozzle exit to increase initial turbulent intensity. A hot wire probe and thermochromic liquid crystal technique were used to measure the turbulent intensity and the surface temperature. All measurements were made over a range of nozzle-to-plate distance from 1 to 10 at Re=20,000. When the rod is not installed, the maximum stagnation point Nusselt number is occurred at H/B=9. A higher initial turbulent intensity enhanced the heat transfer on the surface. A correlation between stagnation point Nusselt number and turbulent intensity are presented.
PIV를 이용한 중방식 도장용 에어리스 팁의 분사패턴 분석
윤순현(Soon-Hyun Yoon),최효성(Hyo-Sung Choi),김동건(Dong-Keon Kim),김봉환(Bong-Hwan Kim),조승완(Seung-Wan Cho) 한국해양공학회 2014 韓國海洋工學會誌 Vol.28 No.2
Heavy duty coating is playing an important role in the field of heavy industry in the development of the shipbuilding and plant industries. Heavy duty coating has the very important function of protecting steel under serious corrosive conditions. The airless tip used for heavy duty coating is an essential part that determines the spray pattern of the paint. This research investigated the injection properties of three airless tips(numbers 521, 523, and 525) by using particle image velocimetry(PIV). The velocity and turbulent intensity according to pressure change with each tip type were investigated by using PIV. If the pressure is greater, the turbulent intensity becomes stronger and the break up of particles becomes bigger as the tip number gets smaller. The velocity is the fastest in the center and decreases in the radial direction
김문경,윤순현,김동건,Kim Moon-Kyung,Yoon Soon-Hyun,Kim Dong-Keon 한국마린엔지니어링학회 2005 한국마린엔지니어링학회지 Vol.29 No.4
Experiments were conducted to investigate the effect of the surface roughness on the flat plate turbulent boundary layer. The square rods were installed at the leading edge to make surface roughness. The particle image velocimetry was used to measure the mean velocities and velocity fluctuation component. All measurements were made over a range of w/k=1. 2 5 and $Re_x=80.000{\sim}360,000$. Friction velocity was measured by using Clauser plot method. The level of turbulent intensities on roughness surface appears more strongly than that of turbulent intensities on flat plate. A correlation of boundary layer thickness in term of $Re_x$ and w/k are presented.