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모장오(J. O. Mo),남구만(G. M. Nam),강신정(S. J. Kang),남청도(C. D. Nam),이영호(Y. H. Lee) 대한기계학회 2002 대한기계학회 춘추학술대회 Vol.2002 No.10
A commercial CFD code is applied to analyze the 3-D viscous flow field within vertical multi-stage centrifugal pump including impeller of centrifugal pump with 6 blades and guide vane with 11 blades. The numerical analysis of vertical multi-stage centrifugal pump is performed by changing flow rate from 10 to 26 ㎥/h at the constant 3500rpm. The characteristics such as total pressure coefficient, total head shaft horse power, power efficiency, discharge coefficient are represented according to flow rate changing. the Vertical multi - stage pump consist of the impeller, guide vane, and cylinder. the grid of numerical analysis used in the Vertical multi - stage pump is 18000, 450000 and 100000 cells in case of impeller, guide vane, cylinder each other, and total grid is 730000 cells In the future, we will need to perform flow calculation of vertical multi-stage centrifugal pump by considering meridional shape of guide vane.
ABS 유압 펌프의 유동특성 및 성능향상에 관한 수치적 연구
모장오(J. O. Mo),민동호(D. H. Min),이상철(S. C. Lee) 한국유체기계학회 2006 유체기계 연구개발 발표회 논문집 Vol.- No.-
The hydraulic system performance is very important since the hydraulic control unit has been controlled by the hydraulic pump for designing advanced braking systems. In this study, a commercial CFD code, FLUENT is applied to analyze the flow characteristics of ABS hydraulic pump using dynamic mesh approach. The numerical analysis of hydraulic pump is conducted to investigate primary factors to have an effect on the pump performance under a suction and compression stroke at the constant 5000 rpm as three conditions which are the shape, mass change of inlet valve and restitution coefficient of that between the inlet valve and inlet seat. The inlet and outlet valve are moved in one direction by the total force which is the pressure force on the valve surface minus the spring force on the support. The results show that the restitution coefficient between the inlet valve and inlet seat is the most primary factor of three conditions to determine the pump performance during a suction stroke.
모장오(J. O. Mo),강신정(S. J. Kang),강호근(H. K. Kang),이영호(Y. H. Lee) 한국유체기계학회 2006 유체기계 연구개발 발표회 논문집 Vol.- No.-
A Numerical study of the cavitation within a centrifugal pump is carried out using CFD commercial code, FLUENT. The objective of this study is to predict the onset of cavitation within the pump blade and the degradation in the pressure rise due to the generation and transport of vapor. A pump designed for the study is a six bladed, one-circular arc impeller design suggested by A.J. Stepanoff et al The Steady-state calculations are performed for a wide range of flow rate without the cavitation to investigate the pump performance. The design head and efficiency show a very good agreement with the numerical results at the design flow rate. After the validation with the numerical results, the pump performance and the onset of cavitation within the blade is predicted by changing NPSH at the design flow rate.