• Title/Summary/Keyword: Flow pump

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Pump performance analysis of Axial Flow Blood Pump using CFD (CFD를 활용한 축류형 혈액펌프의 펌프 특성 해석)

  • 최승한;김동욱
    • Proceedings of the KAIS Fall Conference
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    • 2003.06a
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    • pp.288-290
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    • 2003
  • Artificial heart is divided by pulsation flow type and continuous flow type according to blood circulation pattern. Axial flow blood pump is a kind of continuous flow type artificial heart. Axial flow blood pump would be different pump performance according to impeller's shape and rotating velocity. Pump performance be able to compare by flow rate according to differential pressure and Impeller's rotating velocity. It confirms Impeller model of better efficiency according to compare Pump performance of axial flow blood pump using CFD with actual experiment result.

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A Study of Performance and Internal Flow in a New Type of Sewage Pump

  • Nishi, Yasuyuki;Fukutomi, Junichiro
    • International Journal of Fluid Machinery and Systems
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    • v.2 no.3
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    • pp.239-247
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    • 2009
  • Sewage pumps are designed with a wide flow channel by, for example, sacrificing some efficiency and reducing the number of blades, in order to prevent plugging with foreign bodies. However, the behavior of foreign bodies which actually flow into a pump is extremely complex, and there are questions about whether the presumed foreign bodies will actually pass through. This paper proposes a new type of sewage pump impeller designed to further improve pump efficiency and performance in passing foreign bodies. This sewage pump impeller has a structure in which the suction flow channel of a closed type non-clog pump is wound in a helical spiral. The focus of this research was to investigate pump performance and internal flow in this single blade sewage pump impeller. The results clearly indicated the following facts: The developed sewage pump impeller exhibits high efficiency over a wide range of flow rates; internal flow of the pump is very complicated; and the internal flow state varies greatly when the flow rate changes.

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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Air Influx Characteristics of Turbo Pumps (공기 유입시의 터보펌프 특성)

  • Kim, You-Taek;Nam, Cheong-Do;Kang, Ho-Keun;Lee, Young-Ho
    • 유체기계공업학회:학술대회논문집
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    • 2004.12a
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    • pp.43-48
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    • 2004
  • A screw-type centrifugal pump was manufactured to carry solids primarily and its impeller has a wide flow passage. However, the effect of flow passage shape on delay of the choke due to entrained air has not been clarified yet. Moreover, because its impeller has a particular shape, only few studies have tried to clarify the pump performance and details of internal flow pattern of that pump. For that reason, we carried out the pump performance experiment under air-water two-phase flow condition with different impeller tip clearances, pump rotational speeds and void fractions by using a small screw-type centrifugal pump designed to acquire basic data. In a general centrifugal pump, it was reported that loss of pump head from single-phase flow to the choke due to air entrainment new the best efficiency point was large. However, the loss near the best efficient point in a screw-type centrifugal pump became less than that in a general centrifugal pump.

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Air-Water Two-phase Flow Patterns and Pressure Distributions in a Screw-type Centrifugal Pump

  • Kim, You-Taek
    • Journal of Advanced Marine Engineering and Technology
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    • v.28 no.8
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    • pp.1203-1210
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    • 2004
  • It was reported recently that the pump head degradation near the best efficiency point from single-phase flow to the break-down due to air entrainment became less in a screw-type centrifugal pump than in a general centrifugal pump. In this paper, I carried out internal pressure measurements and visualizations, and investigated the various physical phenomena occurring inside a screw-type centrifugal pump operated in air-water two-phase flow. The results could give some characteristics about the degradation of pump performance on air-water two-phase flow.

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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Characteristics of a Small Screw-type Centrifugal Pump Operating in Air-Water Two-Phase Flow (소형 스크류식 원심펌프의 기액 이상류 특성)

  • Kim, You-Taek;Tanaka, Kazuhiro;Lee, Young-Ho
    • The KSFM Journal of Fluid Machinery
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    • v.2 no.4 s.5
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    • pp.9-15
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    • 1999
  • A screw-type centrifugal pump was manufactured to carry primarily solids and its impeller had a wide flow passage. However, there was an effect on the flow passage shape on delay of the choke due to entrained air not being clarified yet. Moreover, because its impeller has a particular shape, only few studies have tried to clarify the pump performance and details of internal flow pattern of that pump. For this reason, we carried out the pump performance experiment under air-water two-phase flow condition with different impeller tip clearances, pump rotational speeds and void fractions by using a small screw-type centrifugal pump designed to acquire basic data. In a general centrifugal pump, it was reported that there was a loss of pump head from single-phase flow to the choke due to air entrainment near the best efficiency point being large. However, the loss near the best efficient point in a screw-type centrifugal pump became less than that in a general centrifugal pump.

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Numerical Study of Inlet and Impeller Flow Structures in Centrifugal Pump at Design and Off-design Points

  • Cheah, Kean Wee;Lee, Thong-See;Winoto, S.H.
    • International Journal of Fluid Machinery and Systems
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    • v.4 no.1
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    • pp.25-32
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    • 2011
  • The objective of present work is to use numerical simulation to investigate the complex three-dimensional and secondary flow structures developed at the inlet and impeller in a centrifugal pump at design and off-design points. The pump impeller is shrouded with 6 backward swept blades and with a specific speed of 0.8574. The characteristic of the pump is measured experimentally with straight and curved intake sections. Numerical computation is carried out to investigate the pump inlet flow structures and subsequently the flow field within the centrifugal pump. The numerical results showed that strong interaction between the impeller eye and intake section. Secondary flow structure occurs upstream at the pump inlet has great influence on the pump performance and flow structure within the impeller.

The Effect of Pump Intake Leaning Angle and Flow Rate on the Internal Flow of Pump Sump

  • Lee, Youngbum;Kim, Kyung-Yup;Chen, Zhenmu;Choi, Young-Do
    • The KSFM Journal of Fluid Machinery
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    • v.20 no.1
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    • pp.74-80
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    • 2017
  • Pump sump system or pumping stations are built to draw water from a source such as river and used for irrigation, thermal power plants etc. If pump sump is improperly shaped or sized, air entraining vortices or submerged vortices may develop. This may greatly affect pump operation if vortices grow to an appreciable extent. Moreover, the noise and vibration of the pump can be increased by the remaining of vortices in the pump flow passage. Therefore, the vortices in the pump flow passage have to be reduced for a good performance of pump sump station. In this study, the effect of pump intake leaning angle and flow rate on the pump sump internal flow has been investigated. There are three cases with different leaning angle. Moreover, a pipe type with elbow also has been studied. The flow rate with three classes of air entraining vortices has been examined and investigated by decreasing the water level. The result shows that the air entraining vortices easily occurs at the pump intake with large leaning angle. Moreover, the elbow type of the pump intake easily occurs air entraining vortices at the high flow rate (or velocity) in comparison to other pump intake type.

Study on the Leakage Flow and the Flow Analysis of Regenerative Pump (재생펌프의 누설 유동 및 내부 유동에 관한 연구)

  • Shim Chang-Yeul;Kang Shin-Hyoung
    • Proceedings of the KSME Conference
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    • 2002.08a
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    • pp.593-596
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    • 2002
  • Flows in a regenerative pump were calculated for several flow-rates, using the CFX-Tascflow. The calculated results show the vortex structure in the impeller and side channel. The predicted performance shows considerable discrepancy form the measured values for low flow rates. Main source of the difference is the leakage flow of pump strongly affecting the performance of pump. A simple correlation was proposed using calculated leakage flows through the parametric calculations of the simplified passage.

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