• Title/Summary/Keyword: 수력성능

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Water Tests of Fuel Pump for 75-ton Class Liquid Rocket Engine (75톤급 액체로켓엔진용 연료펌프의 수류시험)

  • Kim, Dae-Jin;Choi, Chang-Ho;Hong, Soon-Sam;Kwak, Hyun-D.;Kim, Jin-Han
    • The KSFM Journal of Fluid Machinery
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    • v.14 no.1
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    • pp.61-65
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    • 2011
  • A series of water tests of a fuel pump for liquid rocket engines are performed at a room temperature. According to the test results, the head coefficient of the pump follows the conventional similarity rule - unlike this, the pump shows better efficiency with higher rotational speed. Also, it is found that the pressure at the rear bearing outlet is higher than expected because the inlet of bypass pipe line is narrow. Furthermore, the cavitation performance of the fuel pump is found to be sufficient for the engine operation and is better at the lower flow ratio and higher rotational speed.

Hydraulic Performance Analysis of Francis Type Turbine (프란시스수차의 수력학적 성능특성 분석)

  • Lee, Chul-Hyung;Park, Wan-Soon
    • 한국신재생에너지학회:학술대회논문집
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    • 2009.06a
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    • pp.664-667
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    • 2009
  • The Francis type hydro turbine with vertical axis has been designed and analized for hydraulic performance verification. The guide vane angle of turbine casing were designed to be varied according to the condition of head and flowrate. When the changes in flowrate and output were comparatively large, the efficiency drop were small, so the efficiency characteristics and stability of the entire operating condition were maintained in good condition. These results showed that the developed hydro turbine in this study will be suitable for small hydro power stations with medium and high head such as agricultural reservoirs and large dam.

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A Study on the Performance Prediction of Automotive Water Pump with Double Discharge Single Suction (자동차용 양토출 단흡입 워터펌프의 성능 예측에 관한 연구)

  • 허형석;박경석;이기수;원종필
    • Transactions of the Korean Society of Automotive Engineers
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    • v.12 no.3
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    • pp.27-36
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    • 2004
  • A Numerical analysis has been used to predict the performance in the automotive water pump with double discharge single suction. The influence of parameters such as coolant flow rate, rotational speed, ratio of blade height and clearance has been investigated. Also, the prediction of hydraulic performances such as static pressure rise, shaft power, hydraulic power and pump efficiency is carried out on the water pump including an impeller and a volute casing. A full size water pump test bench has been developed to validate the CFD flow model. Discharge flow rate, suction pressure, discharge pressure, rotational speed and torque measurements are provided. Coolant temperature is 8$0^{\circ}C$, water tank pressure is 1 kgf/$\textrm{cm}^2$ and flow rates vary.

The Effect of the Diameter and Rotational Velocity on the Cavitation Performance of a Turbopump Inducer (터보펌프 인듀서의 흡입성능에 대한 직경과 회전속도의 영향)

  • Sohn, Dong-Kee;Koo, Hyun-Chul;Cha, Bong-Jun;Yang, Soo-Seok;Lee, Dae-Sung
    • The KSFM Journal of Fluid Machinery
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    • v.5 no.1 s.14
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    • pp.27-32
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    • 2002
  • The turbopump inducer cavitation is very important for the success of a liquid rocket engine. In this study, the performance test and cavitation performance test were carried out at various rotational speeds with two inducers of different diameter. The rotational speed was varied by 4000, 6000, and 8000 rpm, and the size effect was tested for the normal inducer and twice-enlarged one. The hydraulic performance results showed that the similarity was satisfied over the entire test range of the present study. The blade thickness effect was examined and showed that the increased blade thickness resulted in decreased efficiency and worse cavitation performance for the large tip clearance. The cavitation performance test results showed that the breakdown NPSH increased as the flow coefficient, and was not affected by the rotational speed.

The Effect of the Diameter and Rotational Velocity on the Cavitation Performance of a Turbopump Inducer (터보펌프 인듀서의 흡입성능에 대한 직경과 회전속도의 영향)

  • Sohn, Dong Kee;Koo, Hyun Chul;Cha, Bong Jun;Yang, Soo Seok;Lee, Dae Sung
    • 유체기계공업학회:학술대회논문집
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    • 2001.11a
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    • pp.229-234
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    • 2001
  • The turbopump inducer cavitation is very important for the success of a Liquid rocket engine. In this study the performance test and cavitation performance test were carried out at various rotational speed with two different diameter inducers. The rotational speed were varied 4000, 6000, 8000 rpm and the variation to the diameter of an inducer were taken as design size and 2 times enlarged size. The major results of the present study were as follows. 1. The hydraulic performance results showed that the similarity was met over the entire test range of the present study. 2. The blade thickness effect was examined and showed that the increased blade thickness resulted in decreased efficiency and worse cavitation performance for large tip clearance. 3. The cavitation performance test results showed that the breakdown NPSH increases as the flow coefficient and does not affected by the rotational speed.

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Performance Characteristic Anaysis of Micro Hydropower Sites (Micro급 수력발전입지의 성능특성 분석)

  • Park, Wan-Soon;Lee, Chul-Hyung
    • 한국태양에너지학회:학술대회논문집
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    • 2012.03a
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    • pp.498-501
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    • 2012
  • A methodology to evaluate the performance analysis for micro hydropower sites has been studied. It consists of two main parts; flow duration function which can describe micro hydropower sites and performance analysis to estimate the output characteristics of micro hydropower plants. The output performance characteristics for Magok stream was analyzed, using developed model. Also, primary design specifications such as design flowrate, installed capacity, operational rate and annual electricity production were estimated and dicussed. Additionally, it was found that the developed model in this study is useful tool to estimate feasibility assessment for micro hydropower sites.

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Hydrodynamic Performance Test of a Turbopump Assembly (터보펌프 조립체의 수력 성능 시험)

  • Hong, Soon-Sam;Kim, Dae-Jin;Kim, Jin-Sun;Kim, Jin-Han
    • Transactions of the Korean Society of Mechanical Engineers B
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    • v.32 no.4
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    • pp.249-254
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    • 2008
  • Hydrodynamic performance test of a turbopump for a liquid rocket engine is carried out. The turbopump is composed of an oxidizer pump, a fuel pump and a turbine, and the two pumps are driven by the turbine. In the test, water is used for the pumps as working media and air is used for the turbine. Performance parameters of pumps and a turbine are drawn, and a power balance between the pumps and the turbine are calculated. The calculation shows a good power balance, which implies that the pump component tests, the turbine component test and the assembly test are reliably performed. At the starting period of the test, pressure rise-flow rate curve of a pump gradually approaches the ideal curve which could be obtained by very slow starting.

Performance Evaluation of a Main Coolant Pump for the Modular Nuclear Reactor by Computational Fluid Dynamics (전산해석에 의한 일체형 원자로용 주냉각재 펌프의 성능분석)

  • Yoon Eui-Soo;Oh Hyoung-Woo;Park Sang-Jin
    • Transactions of the Korean Society of Mechanical Engineers B
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    • v.30 no.8 s.251
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    • pp.818-824
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    • 2006
  • The hydrodynamic performance analysis of an axial-flow main coolant pump for the modular nuclear reactor has been carried out using a commercial computational fluid dynamics (CFD) software. The prediction capability of the CFD software adopted in the present study was validated in comparison with the experimental data. Predicted performance curves agree satisfactorily well with the experimental results for the main coolant pump over the normal operating range. π Ie prediction method presented herein can be used effectively as a tool for the hydrodynamic design optimization and assist the understanding of the operational characteristics of general purpose axial-flow pumps.

Development of Modernization for Overseas Old Small Hydro Power Plants (해외 노후 소수력 발전소 현대화 개발 및 실증)

  • Kim, Woon-Hak;Kang, Seok-Won
    • Proceedings of the Korean Society of Disaster Information Conference
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    • 2017.11a
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    • pp.235-236
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    • 2017
  • 소수력발전소가 건설 후 점검 및 유지보수를 지속적으로 수행 설비성능을 유지하지만, 30년이 경과하면 노후화 및 피로현상으로 성능이 저하되고 경제적 내용연수가 도래한다. 대수력의 경우 전문인력과 점검 및 보수비용을 투자하여 일상, 주간, 월간, 년간, 정기보수를 수행하고 그 기록을 유지관리하고 있지만, 소수력발전소의 경우는 그러하지 못하여 발전소 효율뿐만 아니라 운용중의 안전도 위협받고 있는 상황이다. 본 논문에서는 국내 시설물 안전관리에 관한 특별법에 의거 필리핀에 위치한 노후 수력발전소의 현대화를 위하여 최초 기존 시설물에 대한 안전진단을 실시하여 토목 및 건축물의 보강을 위한 방법을 선정하고 이를 바탕으로 수력발전설비로부터 발생하는 진동과 같은 다양한 영향을 감소시키기 위한 토목기술을 반영하여 현지 환경에 적합한 수차선정과 노후 시설물의 유지보수를 국내 토목 보수 보강 기술로 설계하였다.

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Hydraulic Performance Test of a Turbopump (터보펌프의 수력 성능시험)

  • Hong Soon-Sam;Kim Dae-Jin;Kim Jin-Sun;Choi Chang-Ho;Kim Jinhan
    • Proceedings of the Korean Society of Propulsion Engineers Conference
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    • v.y2005m4
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    • pp.243-247
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    • 2005
  • Hydraulic performance test was conducted for a fuel pump of a liquid rocket engine turbopump. The pump driven by an electric motor was tested in water environment. It is experimentally shown that the inducer had very small effect on the pimp's head and efficiency but great effect on the pump's cavitation performance. Additionally, inducer test was carried out to investigate the effect of the inducer on the pump in detail, and it was found that the pump had a critical cavitation number when the inducer head dropped by $55\%$.

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