http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
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.
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.
Segmental Wedge를 이용한 차압식 유량측정 방법
윤준용,성낙원 한국유체기계학회 2006 한국유체기계학회 논문집 Vol.9 No.6
The discharge coefficient in segmental wedge having ninety degrees vertex angle for the five kinds of opening ratio with differential pressure taps located at both upstream and downstream of one diameter of pipe was measured. Main purpose of this work is placed on specifying the characteristic of discharge coefficient of a segmental wedge used as a primary element of flow metering devices, and suggestion for the fixed location of pressure taps useful. Although the range of the opening ratio over this work is more expanded than previous studies. The opening ratios of segmental wedge, namely 0.3, 0.4, 0.5, 0.6 and 0.7 were investigated. The Reynolds number based on the spool inside diameter ranges from 12,000 to 380,000.1. 서 론* 한양대학교 기계공학과
Segmental Wedge를 이용한 차압식 유량측정 방법
윤준용,성낙원,Yoon J.Y.,Sung N.W. 한국유체기계학회 2006 한국유체기계학회 논문집 Vol.9 No.3
The discharge coefficient in segmental wedge haying ninety degrees yeller angle for the five kinds of opening ratio with differential pressure taps located at both upstream and downstream of one diameter of pipe was measured. Main purpose of this work is placed on specifying the characteristic of discharge coefficient of a segmental wedge used as a primary element of flow metering devices, and suggestion for the fixed location of pressure taps useful. Although the range of the opening ratio over this work is more expanded than previous studies. The opening ratios of segmental wedge, namely 0.3, 0.4, 0.5, 0.6 and 0.7 were investigated. The Reynolds number based on the spool inside diameter ranges from 12,000 to 380,000.
개수로에서 소유사의 영향을 고려한 부유입자 유동에 관한 수치적 연구
윤준용,강승규,강시환 한국수자원학회 2000 한국수자원학회논문집 Vol.33 No.4
본 연구에서는 부유입자를 포함하는 유동을 입자크기와 입자량을 달리한 몇 가지 경우에 대하여 수치적으로 해석하고 Coleman(1981, 1986)의 실험결과와 비교하였다. 완전 난류 유동장을 해석하기 위하여 k-난류모형을 사용하였으며, 농도장 해석을 위해서는 침강속도를 고려한 일반화된 농도방정식을 적용하였다. 유동과 입자의 상호작용은 Einstein과 Chien(1955)의 모형을 도입하여 수치계산하였다. 기존의 대부분 연구에서는 소유사의 두께를 고려하 An numerical analysis of sediment-laden flow is carried out, and results are compared with the experiments of Coleman(1981, 1986) that included the several cases varying sediment size and quantity in open channel flow. K- turbulence model is selected for
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.
윤준용,이승준,김은석 한국유체기계학회 2004 한국유체기계학회 논문집 Vol.7 No.1
A three-dimensional numerical analysis was carried out on incompressible flows in butterfly valves by using commercial FLUENT/UNS code. Characteristics of complex flows including cavitation effect were investigated for different valve disk angles. The butterfly-valves that had different disk angles and different disk shapes were compared with each other in detail. This study focused on the flow analysis in the conventional butterfly valve and the newly designed butterfly valve in order to prevent cavitation. The newly designed valve shows great improvement on performance and endurance.