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곽영균(Y.K. Kwack),신창환(C.H. Shin),이치영(C.Y. Lee),박주용(J.Y. Park),인왕기(W.K. In) 한국전산유체공학회 2012 한국전산유체공학회 학술대회논문집 Vol.2012 No.5
In nuclear reactors, it is important from the point of view of safety to provide adequate cooling of a fuel. Pressure drop and flow distribution are used as key factors. They were obtained by a numerical study of flow in a plate-type nuclear fuel assembly. In the top end fitting, effects of the sudden transition from the circular pipe to the rectangular duct and the fixing bar presence on the flow distribution in each channel were studied. The pressure drops along the assembly were compared with results of experiments.
이중냉각핵연료에서 봉단마개의 측면오리피스에 대한 손실계수 평가
곽영균(Y.K Kwack),신창환(C.H. Shin),이치영(C.Y. Lee),박주용(I.Y . Park),전태현(T.R Chun),인왕기(W.K. In) 한국전산유체공학회 2012 한국전산유체공학회 학술대회논문집 Vol.2012 No.11
In the case of complete entrance blockage of the inner channel, the flow rate of the inner channel should be greater than 60% of normal condition in order to avoid a damaged condition of the nuclear fad. For this purpose, the pressure loss coefficient of a side orifice of bottom end plug was evaluated. The pressure loss coefficient were obtained through simulation analysis of single rod for the end plug. According to the blockage rate of the outer channel, flow pattern and pressure loss coefficient of the side hole were investigated
박주용(J.Y. Park),신창환(C.H. Shin),이치영(C.Y. Lee),곽영균(Y.K. Kwack),전태현(T.H. Chun),오동석(D.S. Oh),인왕기(W.K. In) 대한기계학회 2012 대한기계학회 춘추학술대회 Vol.2012 No.11
For power uprate of Pressurized Water Reactor(PWR), a dual-cooled annular fuel is being developed in Korea Atomic Energy Research Institute(KAERI). The annular fuel rod is configured to allow the coolant flow through the inner channel as well as outer channel. Since the inner channel is isolated from the neighbor channels unlike the outer channels, an inner channel blockage is one of the principal technical issues of a dual-cooled annular fuel. As a hypothetical event, if the inner channel is completely blocked by the debris, the inner cladding may experience a rapid temperature increase because of no further coolant supply. To complement the entrance blockage of an inner channel a long end plug with side holes is conceptually suggested. The experiment is performed to estimate the flow rate through side holes at the side hole blockage event. In this paper, the inner channel flow rate by the side holes was measured and the loss coefficient of side holes was evaluated.
측면분사장치의 형상에 따른 초공동 로켓추진 수중비행체의 항력에 관한 연구
이우근(W.K Lee),유상원(S.W Yoo),김태순(T.S Kim),곽영균(Y.K Kwack),고성호 대한기계학회 2014 대한기계학회 춘추학술대회 Vol.2014 No.11
Cavity is generated by the fluid machine, such as propellers, pump impellers, nozzles, injectors, torpedoes and so when the fluid machine moves very high speed in the underwater. Super cavitation is the use of cavitation effects to create a bubble of gas large enough to cover an object travelling through the underwater. It reduce skin friction drag on the object greatly and make the object can travels very high speed. Super cavitation needs very high speed. Thus when the vehicle moves lower speed cavity bubble can not be generated large enough to cover the vehicle. So the ventilaton devices add to make the cavity bubble cover the vehicle. This study shows the result of effect on the drag force with different shape of ventilation devices. Three different shape of ventilation device are studied. Drag is decreased with increasing gas amount.
고성호(S.H. Ko),곽영균(Y. K. Kwack),이상현(S. H. Lee),강민구(M. K. Kang) 한국전산유체공학회 2007 한국전산유체공학회 학술대회논문집 Vol.2007 No.-
A three dimensional numerical analysis has been made for the cone disk control valve and the flat disk control valve. The simulation of the incompressible flow in the each control vale are performed by using the commercial code. Six flow cases of each control valve are investigated.
고성호(S. H. Ko),곽영균(Y. K. Kwack),오종윤(J. Y. Oh),김윤곤(Y. K. Kim) 한국전산유체공학회 2010 한국전산유체공학회 학술대회논문집 Vol.2010 No.11
Numerical simulation of compresible multi-phase flow involves many difficulties related to interfaces of shock, expansion waves and evaporation. It is difficult to model and compute correctly jump conditions across the interfaces. In this paper, mumerical analysis of multi-phase flows are performed using diffuse interface model for modelling liquid-gas interfaces. The reduced five equation model based on the mixture velocity and mixture pressure is used. These diffuse interfaces relaxation effects are solved in order to match the jump conditions of equal pressure and equal normal velocities. The mumerical evalustion of Riemann solver has been conducted for the classical one-dimensional shock tube and compared with exact solution for error analysis.