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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.
표면 거칠기가 난류 유동장에 미치는 효과에 대한 실험적 연구
윤준용 漢陽大學校 工學技術硏究所 1998 工學技術論文集 Vol.7 No.1
유동장의 속도나 난류 분포를 변화시키는 표면 거칠기 효과는 공학적으로 중요한 연구대상중의 하나이다. 현재까지 거칠기가 존재하는 표면위에서의 난류 유동장에 관한 연구자료는 많지 않으며, 그간의 연구자료는 거칠기 요소를 단순화시키거나 일정한 조건의 거칠기에 대해서만 다루었다. Patel, Yoon(1996)등이 거칠기 효과를 충분히 고려할수 있는 난류 모델을 개발하는등 수치 해석에서도 거칠기에 대한 응용이 이루어지고 있지만, 다양한 거칠기 효과를 연구한 자료는 미미하다. 이에 보다 다양한 거칠기 조건과 유동 조건에 기초한 유동장을 실험적으로 해석였다. 원하는 유동장을 생성시키고 다양한 거칠기 조건의 변화를 위해 직사각단면의 덕트에서 실험하였으며, 2차원 유동장의 난류 특성을 파악하기 위해 열선 유속계를 사용하였다. The effect of surface roughness that changes velocity profile or turbulent distribution of flow field is among the important engineering research area. Until now, there are few research works done on turbulent flows over rough surfaces. A little works dealt with simplified or constantly conditioned roughness elements. Even though study of roughness in the numerical analysis like that Patel and Yoon(1996) had developed about the turbulent model applicable to the roughness effect, only few studies of various roughness effect exist. So, the experimental analysis of the flows in more realistic and plausible conditions based on more various roughness types and flow conditions has done. To acquire the good flow conditions and to change the roughness conditions, duct with rectangular cross section was used as experimental apparatus, and hot-wire anemometer was used for the measurements of 2-dimensional turbulent characteristics.
Large Scale 2차원 자연지형 위에서 대기유동에 관한 수치적 연구
윤준용,강승규 漢陽大學校 工學技術硏究所 1997 工學技術論文集 Vol.6 No.1
The objective of this paper is to develop a computational model for the prediction of the pollutant spread from a complex terrain. The model comprises a two-dimensional, steady state and incompressible flow. This paper is to suggest velocity profile which is very important in the prediction of air pollution. This computational result can apply to predict the spread of pollutants for Sanbon city.
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 한국전산유체공학회 1998 한국전산유체공학회 학술대회논문집 Vol.1998 No.-
Numerical study of three-dimensional turbulent flow in a forward curved centrifugal fan is presented. Standard k-ε turbulence mode and non-orthogonal curvilinear coordinates are 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 state and incompressible. This numerical work is performed with commercial CFD-ACE code developed by CFD Research Corporation. and the results are compared with the experimental data.