• Title/Summary/Keyword: 원심형 펌프

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An Experimental Study on the Centrifugal Pump Characteristics in Air-Water Two-Phase Flow (기액 이상류시의 원심펌프특성에 관한 실험적 연구)

  • Kim, Sung-Yoon;Lee, Sang-Il;Kim, You-Taek
    • Journal of Advanced Marine Engineering and Technology
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    • v.30 no.6
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    • pp.685-692
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    • 2006
  • In a general centrifugal pump, if it is operated in a two-phase flow the activity of the impeller usually degrades and occasionally losses its function. However, the effect of break down of centrifugal pump due to entrained air has not been clarified yet. This paper shows the air-water two-phase flow characteristics of closed type and semi-open type impellers. In a sing1e-phase flow, closed-type impeller has higher efficiency and head. But in air-water two-phase flow semi-open type impeller's rates of decreases of efficiency and head are decreased.

Turbopump System Performance Design for Conceptual Design of Separate Flow Cycle LRE System (개방형 액체로켓엔진시스템 개념설계를 위한 터보펌프시스템 성능설계)

  • Yang Hee-Sung;Park Byung-Hoon;Kim Won-Ho;Ju Dae-Sung;Yoon Woong-Sup
    • Proceedings of the Korean Society of Propulsion Engineers Conference
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    • v.y2005m4
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    • pp.128-133
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    • 2005
  • In this study, performance design programs for components of a turbopump unit (TPU) in a Liquid Rocket Engine (LRE), that has non-cryogenic centrifugal pumps and 1-stage impulse turbine with partial admission nozzle, were developed. The programs were integrated in a TPU module by balancing the mass flow rate for pump-turbine power, and the module was inserted into the LRE system conceptual design program. The fundamental design conditions, satisfying LRE system requirements and minimum mass flow rate condition of gasgenerator, were found and compared with data from a Russian liquid rocket engine.

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Development of Drainage Pump for Rescue Sinking Ship (침수선박 구조를 위한 대용량 배수펌프 개발)

  • Kim, Kyeong-Soo;Jung, Kang-Hyun;Kim, Hae-Young;Kim, Nam-Hun;Cho, Je-Hyoung
    • Journal of Advanced Marine Engineering and Technology
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    • v.39 no.3
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    • pp.248-254
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    • 2015
  • There has been no previous study on technology development of large capacity drainage pump for rescue sinking ship in the country. The agricultural drainage pump was widely used for rescue sinking ship but this pump has several problems such as efficiency, low displacement and malfunction in winter. Therefore, this paper proposes to solve the problems for swiftly rescue sinking ship and develops the drainage pump system that has $20m^3/min$ mass flow rate specification at suction head 8 m. The centrifugal pump type the most commonly used in the field of naval architecture and ocean engineering was selected and designed based on the requirement specification. The blade design of impeller was derived from the Stepanoff coefficient and requirement specification and used computational fluid dynamics to review the target mass flow rate according to the impeller RPM at design operating conditions. We also performed structure analysis of the impeller to find structurally vulnerable points for the pump in service and completed the theoretical design of drainage pump system.

Improvement of Pump Performance and Suppression of Cavitation in a Centrifugal Pump (원심펌프의 성능개선과 캐비테이션 억제에 관한 연구)

  • Choi, Young-Do;Kurokawa, Junichi
    • The KSFM Journal of Fluid Machinery
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    • v.11 no.1
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    • pp.18-25
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    • 2008
  • Recent trends of a centrifugal pump are high speed in rotation and high pressure in head with high efficiency to meet the demands of industries. However, the newly developed pumps make trouble of pressure pulsation in the pumping system by performance instability of the pump. Moreover, cavitation, which is a main obstacle of high rotational speed in the pump, occurring in an impeller gives serious damages to the impeller and casing wall. The purpose of present study is not only to develop a simple method to improve pump performance but also to suppress the occurrence of cavitation in the centrifugal pump by use of J-Groove. J-Groove is a shallow groove installed on the casing wall in the meridional direction. The application of J-Groove to a centrifugal pump with a new type impeller of "semi-closed impeller" has proved its effectiveness as a useful countermeasure of the unstable pump performance and cavitation. The results show that the combination of semi-closed impeller and J-Groove can be applied successfully and improves both the pump performance and suction performance.

Effects of Hydraulic Force on the Unbalance Vibration of Centrifugal Pump Rotors (원심펌프 회전축계의 불평형 응답에 미치는 유체력의 영향)

  • 양보석;최원호
    • Tribology and Lubricants
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    • v.2 no.2
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    • pp.20-26
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    • 1986
  • The paper presents an analytical investigation of the unbalance vibrations of a pump rotor. The analysis applies to rotor-bearing-seal-impeller systems which consist of rigid disks, distributed parameter rotor elements and discreate bearings, seals, and impellers. The dynamic hydraulic force of bearing, seal and impeller elements are represented by four stiffness coefficients arid four damping coefficients. Numerical results are presented for unbalance response associated with various kinds bearing, and with effects of seal and impeller forces.

Internal Flow Analysis of Seawater Cooling Pump using CFD (CFD를 이용한 해수냉각펌프의 내부유동 분석)

  • Bao, Ngoc Tran;Yang, Chang-jo;Kim, Bu-gi;Kim, Jun-ho
    • Journal of the Korean Society of Marine Environment & Safety
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    • v.23 no.1
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    • pp.104-111
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    • 2017
  • This research focuses on simulation and visualization of flow field characteristics inside a centrifugal pump. The 3D numerical analysis was carried out by using a numerical CFD tool, addressing a Reynolds Average Navier-Stock code with a standard k-${\varepsilon}$ two-equation turbulence model. The simulation accounts for friction head loss due to rough walls at suction, impeller, discharge areas and volumetric head loss at impeller wear ring. A comparison of performance curves between simulation and experimentation is included, and it reveals a same trend of those results with a small difference of maximum 5 %. At best efficiency point, velocity vectors are smooth but it changes significantly under off-design point, a strong recirculation appears at the outlet of impeller passages near tongue area. A relatively uniform preassure distribution was observed around the impeller in despite of the tongue. Within the volute, because of its geometry, spiral vortexes formed, proving that the flow field in this region was relatively turbulent and unsteady.

Blood Flow and Pressure Evaluation for a Pulsatile Conduit-Shaped Ventricular Assist Device with Structural Characteristic of Conduit Shape (관형의 구조적 특징을 갖춘 박동형 관형 심실보조장치의 혈류, 혈압 평가)

  • Kang, Seong-Min;Choi, Seong-Wook
    • Transactions of the Korean Society of Mechanical Engineers B
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    • v.35 no.11
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    • pp.1191-1198
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    • 2011
  • The use of a ventricular assist device (VAD) can raise the one-year survival rate without cardiac transplantation from 25% to 52%. However, malfunction of the VAD system causes 6% of VAD patients' deaths, which could possibly be avoided through the development of new VADs in which VAD malfunctions do not affect the patient's heart movement or hemodynamic state. A conventional VAD has an impeller or vane for propelling blood that can allow blood to regurgitate when the propelling force is weaker than the aortic pressure. In this paper, we developed a new pulsatile conduit-shaped VAD that has two valves. This device removes the possibility of blood regurgitation and has a small stationary area even when the pumping force is extremely weak. We estimated the characteristics of the device by measuring the outflow and the pressure of the pump in in-vitro and in-vivo experiments.

A study on the future pattern fire engine development (미래형 소방차 개발에 관한 연구)

  • Kim, Yoo-Shik;Jeong, Kyung-Mon;Oh, Jae-Hoon;Kim, Chang;Kim, Hyeon-Tae
    • Proceedings of the Korea Institute of Fire Science and Engineering Conference
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    • 2011.11a
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    • pp.67-70
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    • 2011
  • 현재 사용되는 대부분의 소방차량은 일반 원심펌프로 보편화된 방수 소화작전이 가능하나 오늘날 첨단화 되어 가는 구조물과 다양한 시설구조의 인프라에 따른 적응에는 한계가 있으며 이러한 현재의 다양한 화재 형태와 양상에 능동적으로 대처하며 효율적인 소방활동을 위하여 전천후 출동과 소규모 인력으로 효과적인 소화활동을 할 수 있도록 차량의 구조 개선과 새로운 유 무선포방수총시스템의 도입과 흠로 및 빙판길 혹은 협소한 출동로도 원활하게 효과적으로 대처할 수 있도록 괘도바퀴와 높은 흡상 및 미분무수 소화시스템을 장착한 미래형 소방차량을 연구 개발하고자 한다.

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A Study on Performance Improvement of Multi-stage Pump Applying CFD Analysis Technique (CFD해석기법을 적용한 다단펌프 성능향상에 관한 연구)

  • Kim, Sang-Yu;Kim, Jae-Yeol;GAO, JIACHEN
    • Journal of the Korean Society of Manufacturing Process Engineers
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    • v.21 no.3
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    • pp.70-76
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    • 2022
  • Recently, the demand for ultra-precision processing has increased owing to the increase in the demand for high-performance ultra-precision optical parts in the fields of information technology (IT), bio, healthcare, aerospace, and future automobiles. In this study, a performance improvement of a multi-stage pump was achieved by improving the pump casing structure rather than using the existing performance improvement method. To verify the performance improvement, the CFD analysis reliability of the existing pump, Pump A, was verified using the FLUENT app in the analysis software ANSYS, and the pump casing was improved through the verified CFD analysis of Pump B. Therefore, we want to analyze the performance improvement.

An Analysis for the Effect of ESP/gas Lift Hybrid System on Oil Productivity (전기공저펌프/가스리프트 혼합시스템이 오일 생산성에 미치는 영향 분석)

  • Lee, Hyesoo;Iranzi, Joseph;Wang, Jihoon;Son, Hanam
    • Journal of the Korean Institute of Gas
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    • v.26 no.5
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    • pp.1-9
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    • 2022
  • Selection of a suitable artificial lift is important in terms of efficient operation and economics for oil production. In general, process of well design includes the selection of artificial lift, but the oil recovery could be enhanced by use of hybrid system combined with two types of artificial lift method according to reservoir condition for oil production. Electric submersible pump (ESP), as a presentative artificial lift method, is a manner for supplying the pressure in the lower part of oil well by using of a multi-stage centrifugal pump with an electric energy. However, there is a disadvantage that has a limit to the application period because of mechanical defection on ESP. Accordingly, it is possible to reduce the shutdown time of production well by applying the ESP/Gas lift hybrid system, which is to switch to a gas lift when an ESP is defective. This study describes the effect of ESP/gas lift hybrid system compared with ESP method for a onshore horizontal well locating in the of Permian basin, USA. As a result of study, ESP/gas lift hybrid system could make more effective productivity than ESP method. Also, we quantitatively predicted how much economic benefit would be obtained when the hybrid system was applied in the production well.