• Title/Summary/Keyword: 디퓨저펌프

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Computational Study of the Bleed-Pump Type Subsonic/Sonic Ejector Flows (추기 펌프형 아음속/음속 이젝터유동에 관한 수치해석적 연구)

  • Kim, Heuy-Dong;Kwon, Oh-Sik;Koo, Byoung-Soo;Choi, Bo-Gyu
    • Proceedings of the KSME Conference
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    • 2000.11b
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    • pp.485-490
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    • 2000
  • This paper dipicts the computational results for the axisymmetric subsonic/sonic ejector systems with a second throat. The numerical simulations are based on a fully implicit finite volume scheme of the compressible Reynolds-Averaged Navier-Stokes equation in a domain that extends form the stagnation chamber to the ejector diffuser exit. In order to obtain practical design factors for subsonic/sonic ejector systems, the ejector throat area, the mixing section configuration, and the ejector throat length were changed in computations. For the subsonic/sonic ejector systems operating in the range of low operation pressure ratio, the effects of the design factors on the flow are discussed.

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Computations of the Bleed-Pump Type Subsonic/Sonic Ejector Flows (추기 펌프형 아음속/음속 이젝터유동에 관한 수치해석적 연구)

  • Choe, Bo-Gyu;Gu, Byeong-Su;Kim, Hui-Dong;Kim, Deok-Jul
    • Transactions of the Korean Society of Mechanical Engineers B
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    • v.25 no.2
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    • pp.269-276
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    • 2001
  • This paper dipicts the computational results for the axisymmetric subsonic/sonic ejector systems with a second throat. The numerical simulations are based on a fully implicit finite volume scheme of the compressible Reynolds-Averaged Navier-Stokes equation in a domain that extends from the stagnation chamber to the ejector diffuser exit. In order to obtain practical design factors for subsonic/sonic ejector systems, the ejector throat area, the mixing section configuration, and the ejector throat length were changed in computations. For the subsonic/sonic ejector systems operating in the range of low operation pressure ratio, the effects of the design factors on the flow are discussed.

A Numerical Study on the Impeller Meridional Curvature of High Pressure Multistage Pump (고압 다단 펌프의 임펠러 자오면 곡선에 대한 수치 해석적 연구)

  • Kim, Deok Su;Jean, Sang Gyu;Mamatov, Sanjar;Park, Warn Gyu
    • Transactions of the Korean Society of Mechanical Engineers B
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    • v.41 no.7
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    • pp.445-453
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    • 2017
  • This paper presents the hydraulic design an impeller and radial diffuser of a high-pressure multistage pump for reverse osmosis. The flow distribution and hydraulic performance for the meridional design of the impeller were analyzed numerically. Optimization was conducted based on the response surface method by varying the hub and shroud meridional curvatures, while maintaining the impeller outlet diameter, outlet width, and eye diameter constant. The analysis results of the head and efficiency with the variation in the impeller meridional profile showed that angle of the front shroud near the impeller outlet (${\varepsilon}Ds$) had the highest effect on head increase, while the hub inlet length ($d_{1i}$) and shroud curvature (Rds) had the highest effect on efficiency. From the meridional profile variation, an approximately 0.5% increase in efficiency was observed compared with the base model (case 25).

Numerical Analysis of Flow Rate Distribution of Diffusers with Various Shapes (다양한 디퓨저 형상의 유량 분배 특성에 관한 수치해석 연구)

  • Kim, Myoung Soo;Kim, Hoo Bae;Choi, Hyoung Gwon
    • Transactions of the Korean Society of Mechanical Engineers B
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    • v.38 no.9
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    • pp.789-795
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    • 2014
  • In this study, the distribution characteristics of diffusers with various shapes that are installed in an open-type thermal storage system are numerically investigated. Four diffusers are designed to distribute a working fluid evenly through the holes on bifurcated pipes. Three-dimensional steady simulations of incompressible laminar flow are conducted using commercial software (ANSYS-FLUENT). The simulation results show that both the bidirectional header-type diffuser and the H-type diffuser distribute the working fluid evenly whereas both the unidirectional and the bidirectional diffusers distribute the working fluid unevenly. The results also show that the H-type diffuser requires a higher head of pump than the bidirectional header-type diffuser. Therefore, the bidirectional header-type diffuser is recommended for use because it enables even distribution of the working fluid and requires a low head of pump.

Study on Performance Evaluation of Mixing Section of Ejector using CFD simulation (CFD 시뮬레이션을 이용한 이젝터 혼합실 형상에 따른 성능 평가에 관한 연구)

  • Sin, Won-Hyeop;Kim, Min-Woo;Park, Young-Chul
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.15 no.5
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    • pp.2610-2616
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    • 2014
  • An ejector is a kind of pump which is using pressure energy of high pressure fluid. This study aims to investigate performance influencing according to change the ejector mixing section shape using CFD simulation by Finite Volume Method. Optimum conditions were suggested 3 kind of variable such as nozzle diameter, nozzle length, distance from nozzle tip to the diffuser inlet. The results, It was confirmed that the diameter of the nozzle was the greatest effect in performance of the ejector. The diameter of the nozzle get smaller, mixing ratio was increased. On the other hand, nozzle length, distance from nozzle tip to the diffuser inlet had little effect on performance. It was proposed specific Mixing section, Nozzel diameter 23.8mm using the Artificial Neural Network.

An Experimental Study of a Diffuser Test Rig for Simulating High-Altitude Environment by using Hot (고온 연소가스를 이용한 고공 환경 모사용 디퓨저 실험장치 연구)

  • Yang, Jae-Jun;Lee, Yang-Suk;Kim, Yoo;Ko, Young-Sung;Kim, Yong-Wook;Kim, Chun-Taek
    • Proceedings of the Korean Society of Propulsion Engineers Conference
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    • 2007.11a
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    • pp.31-34
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    • 2007
  • Performance tests of supersonic exhaust diffuser were conducted by using hot combustion gas for simulating high-altitude environment. The test rig consists of a combustion chamber, a vacuum chamber, water cooling ring and diffuser. Before combustion experiments, the preliminary leak tests were carried out on the liquid rocket engine and diffuser by using high pressure nitrogen(30barg) and a vacuum pump. The leak test results showed that there was no leaks at high pressure and vacuum pressure conditions.

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CFD Study of the Vacuum-Pump Type Subsonic/Sonic Ejector Flows (진공 펌프형 아음속/음속 이젝터 유동에 관한 수치 해석적 연구)

  • 김희동;권오식;최보규
    • Journal of the Korean Society of Propulsion Engineers
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    • v.4 no.4
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    • pp.26-35
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    • 2000
  • This paper depicts the computational results for the axisymmetric subsonic/sonic ejector systems with a second throat. The numerical simulations are based on a fully implicit finite volume scheme of the compressible Reynolds-Averaged Navier-Stokes equations in a domain that extends from the stagnation chamber to the ejector diffuser exit. In order to obtain practical design factors for the subsonic/sonic ejector systems which are applicable to industrial vacuum pumps, the ejector throat area, the mixing section configuration, and the ejector throat length are changed in computations. For the subsonic/sonic ejector systems operating in the range of low operation pressure ratios, the effects of the design factors on the vacuum performance of the secondary chamber are discussed.

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Conceptual Design of KSLV-II 3rd Stage Engine Test Facility (한국형발사체 3단 엔진 연소시험설비 개념설계)

  • Kim, Seung-Han;Chung, Yong-Gap;Han, Yeoung-Min
    • Proceedings of the Korean Society of Propulsion Engineers Conference
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    • 2012.05a
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    • pp.484-488
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    • 2012
  • Korea Aerospace Research Institute (KARI) performed the conceptual design of rocket engine test facility for the development and qualification of the 3rd stage liquid rocket engine for KSLV-II. The 3rd stage rocket engine test facility, which are to be constructed at Naro Space Center, will supply propellants and high-pressure gases to engine for firing test at ground and altitude conditions. The altitude test condition is obtained using a supersonic diffuser operated by the self-ejecting jet from the liquid rocket engine.

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The development of small water-jet propulsion for 150HP grade inboard type (150마력급 선내형 소형 워터제트 추진시스템 개발)

  • Lee, Joong-Seop;Lee, Chi-Woo
    • Journal of Advanced Marine Engineering and Technology
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    • v.38 no.3
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    • pp.246-252
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    • 2014
  • This study is on the development of 150PS inboard type of compact water jet propulsion system. The water jet is composed of intake, impeller, diffuser, reverse bucket and main shaft. Components of water jet have been manufactured through precision processing after sand casting. Development of water jet propelled engine has been finally completed by processes which are design, production and inspection on each component. The water jet performance characteristics show that 0.29 m3/s of maximum flow rate and 37 m/s of flow velocity have been secured in the ground test pool. Field test was performed by 21ft test ship that water jet propulsion equipment developed in this study was installed. As a result, the weight of hull, engine and other parts of the ship has been almost 1.2 ton and 45 km/h of maximum sailing speed has been recorded with 3700 rpm of engine in the domestic coast test.