• 제목/요약/키워드: Centrifugal Pump

검색결과 315건 처리시간 0.023초

볼류트 형상이 원심 펌프의 성능에 미치는 영향에 대한 수치 해석적 연구 (A Numerical Study on the Effect of Volute Geometry on the Performance of Centrifugal Pump)

  • 김덕수;전상규;윤준용;최영석
    • 한국유체기계학회 논문집
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    • 제9권2호
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    • pp.44-49
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    • 2006
  • In this study, the effects of volute area distribution on the performance of a centrifugal pump were numerically studied using a commercial CFD code. To reduce the shutoff head, maintaining head and efficiency at a design flow rate, the flat head-capacity characteristic curves in which the head varies only slightly with capacity from shutoff to design capacity are frequently required. In order to control the shutoff head of a pump, several volute cross-sectional area distributions were proposed as a main parameter with the same impeller geometry The calculation results show that the slope of the performance characteristic curve of the centrifugal pump can be controlled by modifying the area distribution from volute tongue to volute outlet with fixed volute outlet area and also varied volute outlet area.

볼류트 형상이 원심 펌프의 성능에 미치는 영향에 대한 수치 해석적 연구 (A Numerical Study on the effect of Volute Geometry on the Performance of Centrifugal Pump)

  • 김덕수;최영석;전상규;윤준용
    • 유체기계공업학회:학술대회논문집
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    • 유체기계공업학회 2005년도 연구개발 발표회 논문집
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    • pp.497-502
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    • 2005
  • In this study. the effect of volute area distribution on the performance of a centrifugal pump were numerically studied using a commercial CFD code. To reduce the shutoff head, maintaining head and efficiency at a design flow rate. the flat head-capacity characteristic curves in which the head varies only slightly with capacity from shutoff to design capacity are frequently required. In order to control the shutoff head of a pump, several volute cross-sectional area distributions were proposed as a main parameter with the same impeller geometry. The calculation results show that the slope of the performance characteristic curve of the centrifugal pump can be controlled by modifying the area distribution from volute tongue to volute outlet with fixed volute outlet area and also varied volute outlet area.

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볼류트 단면적 변화가 원심펌프의 성능곡선에 미치는 영향 (Effect of Volute Area Distributions on the Performance Characteristic Curve of a Centrifugal Pump)

  • 김덕수;이경용;윤준용;최영석
    • 대한설비공학회:학술대회논문집
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    • 대한설비공학회 2005년도 동계학술발표대회 논문집
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    • pp.558-563
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    • 2005
  • In this paper, the effect of volute area distribution on the performance characteristic curve of a centrifugal pump were numerically studied using a commercial CFD code. To reduce the shutoff head, maintaining head and efficiency at a design flow rate, the flat head-capacity characteristic curves in which the head varies only slightly with capacity from shutoff to design capacity are frequency required. In order to control the shutoff head of a pump, several volute area distributions were proposed as a main parameter with the same impeller geometry. The calculation results show that the characteristic curve of a centrifugal pump can be controlled by modifying the area distribution with the same volute outlet area.

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기액 이상류시의 스크류식 원심펌프의 압력분포 (Pressure Distributions of a Screw-type Centrifugal Pump Operating in Air-Water Two-Phase Flow)

  • 김유택;최민선;이영호
    • 한국유체기계학회 논문집
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    • 제4권3호
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    • pp.39-45
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    • 2001
  • It is reported recently that the pump head deterioration near the best efficiency point, from single-phase flow to the choke due to air entrainment became less in a screw-type centrifugal pump than in a general centrifugal pump. Moreover, at a narrow tip clearance, the pump head became partially higher in two-phase flow than that in single-phase flow. However, the internal pressure fluctuations on this pump due to air entrainment have not been studied yet. For that reason, we have examined the influences of void fraction, flow coefficient and impeller tip clearance on pressure fluctuations in the casing. The void fraction became larger, the influence of tip clearance on pressure distribution became less.

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양쪽 흡입 원심펌프의 성능해석에 대한 연구 (A Study of Performance Analysis for a Double-Suction Centrifugal Pump)

  • 정경남;박편구;조현준;이상구
    • 한국유체기계학회 논문집
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    • 제4권4호
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    • pp.7-15
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    • 2001
  • Flow analysis was carried out for a double-suction centrifugal pump. Impeller-only models and a full pump model were used to simulate the velocity field and the pressure field of the pump. Heads and efficiencies were calculated with flow rates in order to obtain general performance of the pump. The calculation results were compared to the experimental data, and satisfactory results were obtained. Thus, it may be said that the CFD serves as a useful tool for pump designs.

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극저비속도 원심펌프의 불안정성능개선 및 소형화에 관한 연구 (Improvement of Performance Instability and Miniaturization of Very Low Specific Speed Centrifugal Pump)

  • 최영도;쿠로카와준이치
    • 한국유체기계학회 논문집
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    • 제10권4호
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    • pp.21-28
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    • 2007
  • The ratio of disk friction loss in a centrifugal pump is very large for the total pump loss in the range of very low specific speed. Therefore, impeller radius should be shortened to increase the pump efficiency because the disk friction loss is proportional to the fifth power of impeller radius. In order to compensate the decreased head by the shortened impeller radius, vane angle at impeller outlet should be increased. However, as the vane angle at impeller outlet becomes larger, performance instability occurs at low flow rate regions. In this study, J-Groove is adopted to suppress the performance instability and detailed examination is performed for the influence of the J-Groove on the pump performance. The results show that J-Groove gives good effect on the suppression of performance instability. Moreover, as J-Groove increases pump head considerably, the pump size can be smaller for head requirements.

Matching Diffuser Vane with Return Vane Installed in Multistage Centrifugal Pump

  • Kawashima, Daisuke;Kanemoto, Toshiaki;Sakoda, Kazuyuki;Wada, Akihiro;Hara, Takashi
    • International Journal of Fluid Machinery and Systems
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    • 제1권1호
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    • pp.86-91
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    • 2008
  • The effects of the diffuser vane on the performances of the multistage centrifugal pump were investigated experimentally, taking account of the interactions among the diffuser vane, the return vane, and the next stage impeller. It is very important to match well the diffuser vane with the return vane, for improving the hydraulic efficiency of the pump. The efficiency may be more improved by making the cross-sectional area of the channel from the diffuser vane outlet to the return vane inlet larger, as much as possible.

공기 흡입이 소형 스크류식 원심펌프의 특성에 미치는 영향 (Effects of Entrained Air on the Characteristics of a Small Screw-type Centrifugal Pump)

  • 김유택;다나카카즈히로;이영호;마쯔모토요이치로
    • 한국유체기계학회 논문집
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    • 제2권3호
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    • pp.37-44
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    • 1999
  • In a screw-type centrifugal pump, the pump head deteriorates from single-phase flow to the choke due to an increased air entrainment at a wide tip clearance compared to that of a narrow tip clearance. Moreover, at a narrow tip clearance, the pump head became partially higher in a two-phase flow than that of a single-phase flow near the best efficiency point in low void fraction region. Therefore, we observed the internal flow pattern by using a stroboscope and we measured the mean size of bubbles from the images obtained with a high speed camera. Then, we investigated the influences of the mean size of bubbles, tip clearances and flow patterns on pump performance.

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뉴턴유체와 비뉴턴유체의 원심펌프성능특성 비교 (Comparison of Centrifugal Pump Performances for Newtonian and Non-Newtonian Fluids)

  • 김동주;노형운;서상호
    • 유체기계공업학회:학술대회논문집
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    • 유체기계공업학회 2004년도 유체기계 연구개발 발표회 논문집
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    • pp.57-62
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    • 2004
  • In the current study the effects on pump performances of a conventional centrifugal pump for Newtonian and non-Newtonian fluid were experimentally studied. The study aimed to compare the pump characteristics for Newtonian and non-Newtonian fluid. The working fluids are water, aqueous sugar solution, glycerin solution, muddy solution and pulp solution. The pump characteristics with high viscosity fluids were different. The operating efficiency for the sugar and glycerin solutions were decreased to $8.1\%$ and $12.9\%$ than that of water. The head reductions of the muddy solution for different concentration ratios were decreased to $7.97\%,\;15.11\%$ and $24.87\%$ than that of water And the head reductions of the pulp solution for different concentration ratios were decreased to $11.87\%,\;19.79\%$ md $36.81\%$ than that of water.

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원심펌프축계의 최적설계 (The optimum design for rotating shaft centrifugal pump)

  • 양보석;오세규
    • Journal of Advanced Marine Engineering and Technology
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    • 제13권1호
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    • pp.69-76
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    • 1989
  • This paper presents a method of the optimum design for rotating shaft of centrifugal pump. That is, the object is to optimize the system in stability at the operating speed, unbalance response in the vicinity of the rotor critical speed, leakage flow of the seals. The objective function is composed of these three elements and is minimized by changing seal cleareance, diamoters, and lengths. A typical double suction centrifugal pump is analyzed and its objective function is presented. Then the optimum dimensions of seals are obtained, and vibration characteristics at both initial and optimum conditions are investigated.

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