• Title/Summary/Keyword: Mixed-flow-pump

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STUDY ON THE HYDRAULIC DESIGN OF 2 STAGE MIXED FLOW PUMP (2단 사류펌프의 임펠러 성능향상 방안 연구)

  • Kim, Y.J.;Woo, N.S.;Kwon, J.K.;Chung, S.K.;Park, U.S.;Bae, S.E.;Park, S.H.
    • 한국전산유체공학회:학술대회논문집
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    • 2011.05a
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    • pp.556-560
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    • 2011
  • The seawater lift pump system is responsible for maintaining the open canal level to provide the suction flow of circulating water pump at the set point. The objective of this paper is to design a 2-stage mixed flow pump(for seawater lifting) by inverse design and to evaluate the overall performance and the local flow fields of the pump by using a commercial CFD code. Rotating speed of the impeller is 1,750 rpm with the flow rate of 2,700 $m^3/h$. Finite volume method with structured mesh and Realizable ${\kappa}-{\varepsilon}$ turbulent model is used to guaranty more accurate prediction of turbulent flow in the pump impeller. The numerical results such as static head brake horse power and efficiency of the mixed flow pump are compared with the reference data. Also, the periodic condition calculation method for the mixed flow pump was carried out in order to investigate the pump performance characteristics with the modification of impeller geometry.

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Performance Analysis of a Mixed-Flow Pump for Waterjet Propulsion

  • Ahn Jong-Woo;Kim Ki-Sup;Park Young-Ha;Kim Kyung-Youl;Oh Hyoung-Woo
    • Journal of Ship and Ocean Technology
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    • v.9 no.2
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    • pp.11-20
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    • 2005
  • A mixed-flow pump is largely applied for waterjet propulsion in high-speed vessels because of excellent cavitation performance. For the present study, we analyze the performance of mixed-flow pump, which is composed of impeller and stator. The test device for a mixed-flow pump was installed in the test section in the KRISO cavitation tunnel. The performance tests of two mixed-flow pumps were carried out with the test device at various flow rates using various nozzles. The test results agree fairly well with the predicted results by commercial CFD code. The test device is available for verification of impeller performance together with CFD analysis

Numerical Investigation of Secondary Flow in 3 Pump Stages: Centrifugal Multistage/Mixed-flow Stage/ Axial-flow Stage (원심형, 사류형, 축류형 펌프단에서 살펴본 이차유동의 수치적 고찰)

  • Oh, Justin
    • 유체기계공업학회:학술대회논문집
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    • 2005.12a
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    • pp.359-364
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    • 2005
  • Centrifugal pump shows the strongest secondary flow. Wake is formed near pressure surface close to hub at impeller exit for centrifugal pump impeller. Pressure gradient drives secondary flow in the inducer region, while in the remaining region the following sources drive together: > Pressure gradient > Coriolis force Low-momentum fluid near suction surface hub moves toward pressure surface hub in mixed-flow pump impeller. Tip leakage vortex dominate secondary flow in axial-flow pump impeller. Tip leakage vortex dominate secondary flow in axial-flow in axial-flow pump impeller

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Blade Shape Design of Mixed-flow Pump Impellers and Diffusers in a Fixed Meridional Geometry (자오면 고정 형상에서 사류펌프 임펠러 및 디퓨져 날개형상 설계)

  • Kim, Sung;Choi, Young-Seok;Lee, Kyoung-Yong
    • Proceedings of the SAREK Conference
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    • 2009.06a
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    • pp.1203-1208
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    • 2009
  • In this paper, the flow characteristics of the mixed-flow pump impellers and diffusers were numerically predicted by commercial CFD software and DOE(design of experiments). We also discussed how to improve the performance of the mixed-flow pump by designing the impeller and diffuser in the mixed-flow pump. Geometric design variables were defined by the vane plane development which indicates the blade-angle distributions and length of the impeller and the diffusers. Firstly, the design optimization of the defined impeller geometric variables has been done. After that, the flow characteristics were analyzed in the point of incidence angle at the diffuser leading edge for the optimized impeller. Then design of the defined diffuser shape variables has been performed. The reason for the performance improvement was discussed by examining the flow characteristics through the diffuser.

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A Numerical Study on the Performance Analysis of the Mixed Flow Pump for FPSO (수치해석을 이용한 FPSO용 사류펌프 성능해석 연구)

  • Kang, Kyung-Won;Kim, Young-Hun;Kim, Young-Ju;Woo, Nam-Sub;Kwon, Jae-Ki;Yoon, Myung-O
    • The KSFM Journal of Fluid Machinery
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    • v.14 no.5
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    • pp.12-17
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    • 2011
  • The seawater lift pump system is responsible for maintaining the open canal level to provide the suction flow of circulating water pump at the set point. The objective of this paper is to design a 2-stage mixed flow pump (for seawater lifting) by inverse design method and to evaluate the overall performance and the local flow fields of the pump by using a commercial CFD code. Rotating speed of the impeller is 1,750 rpm with the flow rate of 2,700 $m^3$/h. Finite volume method with structured mesh and realized k-${\varepsilon}$ turbulent model is used to guaranty more accurate prediction of turbulent flow in the pump impeller. The numerical results such as static head, brake horse power and efficiency of the mixed flow pump are compared with the design data. The simulated results are good agreement with the design data less 3% error.

CFD Analysis of Cavitation Phenomena in Mixed-Flow Pump

  • Sedlar, Milan;Sputa, Oldrich;Komarek, Martin
    • International Journal of Fluid Machinery and Systems
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    • v.5 no.1
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    • pp.18-29
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    • 2012
  • This paper deals with the CFD analysis of cavitating flow in the mixed-flow pump with the specific speed of 1.64 which suffers from a high level of noise and vibrations close to the optimal flow coefficient. The ANSYS CFX package has been used to solve URANS equations together with the Rayleigh-Plesset model and the SST-SAS turbulence model has been employed to capture highly unsteady phenomena inside the pump. The CFD analysis has provided a good picture of the cavitation structures inside the pump and their dynamics for a wide range of flow coefficients and NPSH values. Cavitation instabilities were detected at 70% of the optimal flow coefficient close to the NPSH3 value (NPSH3 is the net positive suction head required for the 3% drop of the total head of the pump).

Influence of the impeller inlet angles on flow pattern and characteristics of mixed-flow pump (사류 임펠러의 입구각 변화가 내부유동 및 펌프특성에 미치는 영향)

  • Lee, Seon-Gi
    • Transactions of the Korean Society of Mechanical Engineers B
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    • v.21 no.8
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    • pp.1034-1045
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    • 1997
  • For the improvement of the pump characteristics in the partial capacity range, it must be verified that the influence of the impeller design factor on the internal flows and the influence of the impeller internal flows on the pump characteristics. In this paper, in order to understand the influence of inlet angles on flow conditions and characteristics of a mixed flow pump, experiments were carried out for three kinds of impeller, which have the same outlet angle distributions and meridional section shapes. Results show that separation and stall in the partial capacity range can be controlled by the inlet angles. The relationship between the separation - stall at the impeller leading edge and the discharge flow conditions is clarified.

Numerical Study on Three-Dimensional Flow in a Mixed-Flow Pump for Irrigation and Drainage (양배수용 사류펌프 내 삼차원 유동에 대한 수치적 연구)

  • Kim, Jin-Hyuk;Ahn, Hyoung-Jin;Kim, Kwang-Yong
    • The KSFM Journal of Fluid Machinery
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    • v.13 no.1
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    • pp.17-22
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    • 2010
  • In this paper, numerical study on a mixed-flow pump for irrigation and drainage has been performed based on three-dimensional viscous flow analysis. Reynolds-averaged Navier-Stokes equations with shear stress transport turbulence model are discretized by finite volume approximations and solved by the commercial CFD code ANSYS CFX-11.0. A structured grid system is constructed in the computational domain, which has O-type grids near the blade surfaces and H/J-type grids in other regions. The numerical results were validated with experimental data for the heads and efficiencies at different flow coefficients. The efficiency at the design flow coefficient is evaluated with the variation of two geometric variables related to area of discharge and length of the vane in the diffuser. The results show that efficiency of the mixed-flow pump at the design flow coefficient is improved by the modifications of the geometry.

Design and Performance Analysis of Mixed-Flow Pumps for Waterjet Marine Propulsion (워터제트 선박추진용 사류펌프의 설계 및 성능해석)

  • Yoon, Eui-Soo;Oh, Hyoung-Woo;Ahn, Jong-Woo
    • The KSFM Journal of Fluid Machinery
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    • v.6 no.2 s.19
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    • pp.41-46
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    • 2003
  • The hydraulic design optimization and performance analysis of mixed-flow pumps for waterjet marine vehicle propulsion has been carried out using mean streamline analysis and three-dimensional computational fluid dynamics (CFD) code. In the present study, the conceptual design optimization has been formulated with a non-linear objective function to minimize the fluid dynamic losses, and then the commercial CFD code was incorporated to allow for detailed flow dynamic phenomena in the pump system. Newly designed mixed-flow model pump has been tested in the laboratory. Predicted performance curves by the CFD code agree very well with experimental data for a newly designed mixed-flow pump over the normal operating conditions. The design and prediction method presented herein can be used efficiently as a unified hydraulic design process of mired-flow pumps for waterjet marine vehicle propulsion.

Design and Performance Analysis of Mixed-Flow Pump: for Waterjet Marine Propulsion (Waterjet 선박추진용 사류펌프의 설계 및 성능해석)

  • Hwang, Soon-Chan;Yoon, Eui-Soo;Oh, Hyoung-Woo;Choi, Bum-Seog;Park, Moo-Ryong;Ahn, Jong-Woo
    • 유체기계공업학회:학술대회논문집
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    • 2002.12a
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    • pp.47-53
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    • 2002
  • The hydraulic design optimization and performance analysis of mixed-flow pumps for waterjet marine vehicle propulsion has been carried out using mean streamline analysis and three-dimensional computational fluid dynamics (CFD) code. In the present study the conceptual design optimization has been formulated with a non-linear objective function to minimize the fluid dynamic losses and then the commercial CFD code was incorporated to allow for detailed flow dynamic phenomena in the pump system. New designed mixed-flow model pump has been tested in the laboratory. Predicted performance curves by the CFD code agree very well with experimental data for a newly designed mixed-flow pump over the normal operating conditions. The design and prediction methods presented herein can be used efficiently as a unified hydraulic design process of mixed-flow pumps for waterjet marine vehicle propulsion.

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