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PTC 서미스터를 이용한 유속계의 성능향상에 관한 연구
윤준용,조남규,김진래,성낙원,김광진,Yoon, Joon-Yong,Cho, Nahm-Gyoo,Kim, Jin-Rae,Sung, Nak-Won,Kim, Hwang-Jin 한국유체기계학회 2000 한국유체기계학회 논문집 Vol.3 No.4
An anemometer employing the bulk PTC thermistor as the sensing element is investigated in this study. The numerical and experimental works are carried out to improve the sensitivity problem of the element by focusing fluid dynamics point of view. The typical shape of the sensing element has been used as a rectangular type, but this shape has a sensitivity problem because of flow separations on the sharp edge when the flow direction is different from that of the sensing element. In order to reduce the reading error, the installer has to be very careful about the flow direction. The reading error fluctuation by time as well as the sensitivity problem can be improved considerably through this study. It can be concluded that the small change of the sensor shape can improve the performance of the flow sensor.
고차압 제어용 글로브 밸브 트림 내부의 3차원 유동장 해석
윤준용,변성준,양재모,이도형,Yoon, Joon-Yong,Byun, Sung-Joon,Yang, Jae-Mo,Lee, Do-Hyung 한국유체기계학회 2001 한국유체기계학회 논문집 Vol.4 No.3
Numerical analysis of the three dimensional turbulent flow field in a complex valve trim is carried out to confirm the possibility whether this simulation tool can be used as a design tool or not. The simulation of the incompressible flow in a glove valve is performed by using the commercial code. CFD-ACEA utilizes the finite volume approach as a discretization scheme, and the pressure-velocity coupling is made from SIMPLEC algorithm in it. Four flow cases of the control valve are investigated, and the valve flow coefficient for each case is compared with the experimental data. Simulation results show a good agreement with the experiments, and it is observed that the cavitation model improves the simulation results.
윤준용,맹주성,변성준,이상환,Yoon, Joon-Yong,Maeng, Joo-Sung,Byun, Sung-Joon,Lee, Sang-Hwan 대한기계학회 2000 大韓機械學會論文集B Vol.24 No.7
Numerical study of three-dimensional turbulent flow in a forward curved centrifugal fan is presented. Standard $k-{\varepsilon}$ turbulence model and non-orthogonal curvilinear coordinates arc used to consider the turbulent flow field and complex geometry. Finite Volume approach is adopted for discretization scheme and structured grid system is used to help convergence. Multiblock grid system is used for flow field and divided into five domains that are inlet, outlet, impeller, tip clearance and scroll. It is assumed that the flow field is steady and incompressible. These numerical results are compared with the experimental data inside a rotor and at the fan outlet. Most important flow features are captured through this numerical approach. Finally details of flow field inside a fan are described and analyzed.
동압 유체 베어링 이론을 적용한 수도미터의 성능향상에 관한 연구
윤준용,성낙원,김병호,Yoon, Joon-Yong,Sung, Nak-Won,Kim, Byung-Ho 한국유체기계학회 2000 한국유체기계학회 논문집 Vol.3 No.1
A study to minimize the error in water-meter is considered in this work. It is presumed that the large amount of error at large flowrate is occurred due to the vibration of the impeller shalt. After a newly designed bushing applying hydrodynamic journal bearing theory is adopted, the error at large flow rate is decreased remarkably comparing with the classical water-meter. It is concluded that the effect of a bushing in water-meter stabilizes the rotator of the impeller shaft.
표면 거칠기 효과를 고려한 2-방정식 난류 모델의 성능평가
윤준용,천정민,강승규,변성준,Yoon, Joon-Yong,Chun, Jung-Min,Kang, Seung-Kyu,Byun, Sung-Joon 대한기계학회 2003 大韓機械學會論文集B Vol.27 No.12
The effect of roughness is a change in the velocity and turbulence distributions near the surface. Turbulence models with surface roughness effect are applied to the fully developed flow in a two-dimensional, rough wall channel. Modified wall function model, low-Reynolds number k-$\varepsilon$ model, and k-$\omega$ model are selected for comparison. In order to make a fair comparison, the calculation results are compared with the experimental data. The modified wall function model and the low-Reynolds number k-$\varepsilon$ model require further refinement, while the k-$\omega$ model of Wilcox performs remarkably well over a wide range of roughness values.
오리피스 전단에 인접한 90° 엘보와 편심율의 변화가 유출계수에 미치는 영향에 관한 실험적 연구
윤준용(Joon-Yong Yoon),김효섭(Hyo-Seop Kim),성낙원(Nak-Won Sung) 한국유체기계학회 2007 유체기계 연구개발 발표회 논문집 Vol.- No.-
The effect of distance between ninety degree elbow close to upstream face of orifice plate and orifice plate on discharge coefficient was investigated. The distributions of discharge coefficient and differential pressure caused by elbow and short upstream straight length were examined and modified discharge coefficient was introduced. Eccentric orifice also investigated to examine the relationship between eccentricity and straight length with simple disturbance. The results presented in this study could be useful when orifice plate is installed under the condition of simple flow disturbance element and short upstream straight length.