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조장근,박원규,Cho, Jang-keun,Park, Warn-gyu 한국유체기계학회 1999 한국유체기계학회 논문집 Vol.2 No.2
The three-dimensional numerical study of a water jet pump was carried out to investigate the relationship between performance and the geometric variables of nozzle space, area ratio, and throat length. Because of the complex geometry, the multiblock technique was adopted for numerical analysis and a special treatment for transferring data from each of the block interfaces was implemented in order to maintain the conserved properties. To validate the present code, flow passing through a square duct with a 90-deg bend was computed, our results show good accordance with other experimental and computational results. The numerical simulation was done with the flow of the water jet pump having a 180-deg bend in order to calculate the performance at different operating conditions. The performance of the water jet pump can be improved by study of parameters which clarify the relations between the geometric variables and the flow characteristics of vortex strength and location.
조장근(Jang-keun Cho),박원규(Warn-gyu Park),오세민(Se-min Oh),천남영(Nam-young chun) 한국전산유체공학회 1997 한국전산유체공학회 학술대회논문집 Vol.1997 No.-
The performance of several Jet Pumps has been investigated numerically, Principal geometry variables which affect the performance are area ratio, throat length and nozzle spacing, We investigated the changes of performance through parametric study. Also we involved the study of recirculation in the diffuser, which is caused by the centrifugal force due to the bended pipe or by the adverse pressure gradient in the diffuser. 3D unsteady incompressible Navier-Stokes equations is applied to our investigation, using second-order accurate schemes for the time derivatives and third/second-order scheme for the spatial derivatives. The Mecker-and-cell concept is applied to efficiently solve continuity equation, The forth-order artificial damping is added to the continuity equation for numerical stability.