• Title/Summary/Keyword: Guide Vane

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A Study on Hydraulic Performance of Francis Turbine for Small Hydropower Plants (소수력 발전용 상용 프란시스 수차의 유동해석을 통한 성능 개선에 관한 연구)

  • Choi, Ju-Seok;Kim, Ok-Sam;Kim, Il-Soo;Chun, Chul-Kyun;Moon, Chae-Joo
    • Journal of the Korean Solar Energy Society
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    • v.25 no.3
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    • pp.19-25
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    • 2005
  • Francis turbine of commercial small hydropower plants under 10kw which is investigate a flow characterist and an efficiency in the research which it sees, the problem and an improvement is investigate. In the research which it is simply model with casing, guide-vane, runner, draft tube for simulation numerical analysis of small-sized Francis turbine. Model uses the Gambit and it composes with approximately 800,000 non-uniform lattices. Solutions are investigate the hydraulic characteristics against an outward angle of guide vane, the number of guide vane, head(inlet velocity) by using FLUENT which is a commercial business code.

An Experimental Study on the Performance of a Surface Piercing Propeller in Tunnel (수면관통형 터널 프로펠러의 성능해석을 위한 실험적 연구)

  • Jeong, Seong-Wook;Lee, Seung-Hee
    • Special Issue of the Society of Naval Architects of Korea
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    • 2007.09a
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    • pp.107-117
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    • 2007
  • A surface piercing propeller (SPP) in tunnel has been proposed recently as a new propulsion system for a high speed air cavity ship. The purpose of the present study is to investigate the characteristics of the SPP in tunnel through a series of model tests. A model propulsion system is placed on a dummy body made of Acrylics. The tunnel is divided into two regions by a guide vane extending from the inlet to the center of the propeller shaft. Air has been supplied from an air nozzle placed at the bottom of the dummy body and the changes in propeller performances caused by the air flow are investigated. The measurements are done for open water and in-tunnel conditions, both for fully and partially submerged propeller. The influence of the guide vane configurations on the propeller performance is also studied. The experiments are performed at the variable pressure circulation water channel of Inha University.

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Active Surge Control with Variable Inlet Guide Vane

  • Choi, Wook-Jin;Kim, Sang-Un;Won, Sang-Chul
    • 제어로봇시스템학회:학술대회논문집
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    • 2004.08a
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    • pp.1211-1214
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    • 2004
  • In this paper, we propose to use variable inlet guide vane as a means of active surge control to solve above problems. There is some advantage. For example, since the inlet guide vanes are already present in POSCO, no additional actuation device is required. We can collect all data easily which is related to the test and can simulate new model using our compressors. We can obtain the result that blow-off valve is opened less 5% and can operate air compressor automatically and more efficiently. Through a simulation example, the effectiveness of the proposed schemes is illustrated.

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Simulation of turbulent flow of turbine passage with uniform rotating velocity of guide vane

  • Wang, Wen-Quan;Yan, Yan
    • Coupled systems mechanics
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    • v.7 no.4
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    • pp.421-440
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    • 2018
  • In this study, a computational method for wall shear stress combined with an implicit direct-forcing immersed boundary method is presented. Near the immersed boundaries, the sub-grid stress is determined by a wall model in which the wall shear stress is directly calculated from the Lagrangian force on the immersed boundary. A coupling mathematical model of the transition process for a model Francis turbine comprising turbulent flow and rotating rigid guide vanes is established. The spatiotemporal distributions of pressure, velocity, vorticity and turbulent quantity are gained with the transient process; the drag and lift coefficients as well as other forces (moments) are also obtained as functions of the attack angle. At the same time, analysis is conducted of the characteristics of pressure pulsation, velocity stripes and vortex structure at some key parts of flowing passage. The coupling relations among the turbulent flow, the dynamical force (moment) response of blade and the rotating of guide vane are also obtained.

A Study on the Performance of a 5 kW Scale VAWT with Omni-Directional Guide Vanes

  • Ryu, In-Ho;Hoang, Anh Dung;Kim, Jun-Ho;Lee, Ki-Seon;Yang, Chang-Jo
    • The KSFM Journal of Fluid Machinery
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    • v.19 no.4
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    • pp.43-47
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    • 2016
  • Vertical axis wind turbine, despite of its limit in power efficiency, the simplicity in structure and maintenance is a competitive factor that keeps this type of turbine in the game until nowadays. Continuous solutions have been given to handle its major weakness and the use of omni-directional guide vane is an considerable one. In this paper, a 5kkW scale Savonius-based wind turbine enhanced with such guide vane system was design and studied. Together with reasonable blade design, the wind turbine shows promising performance compared with basic design while maintaining its original advantages.

2-Dimensional Flow Analysis of Impulse Turbine for Wave Energy Conversion (파랑에너지 변환용 충동터빈의 2차원 유동해석)

  • ;;;;;T. Setoguchi
    • Proceedings of the Korean Society of Marine Engineers Conference
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    • 2001.05a
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    • pp.21-27
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    • 2001
  • This paper describes numerical analysis of the impulse turbine with fixed guide vanes, a high performance bi-directional air turbine having simple structure for wave energy conversion. The numerical analysis of the 2-dimensional incompressible viscous flow based on the full Reynold-averaged Navier-Stokes equations which was made to investigate the internal flow behavior. Numerical results are compared with experimental data obtained by T.Setoguchi laboratory. As a result, as suitable choice of design factor has been clarified with the understanding of the internal flow from the numerical analysis.

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Computational and Experimental Study of Effects of Guide Vanes and Tip Clearances on Performances of Axial flow Fans (선박용 송풍기의 날개 끝 간격과 정익이 성능에 미치는 영향에 대한 전산 유체 해석)

  • Lee, Sung-Su;Kim, Hak-Sun;Nam, Kwang-Hyun;Hong, Jae-Ik;Chun, Seung-Hyun
    • Journal of the Society of Naval Architects of Korea
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    • v.41 no.6
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    • pp.24-32
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    • 2004
  • The effects of guide vanes and tip clearances on the characteristics nf axial flow fans are investigated both computationally and experimentally. Performance test of fans carried out in full scale shows considerable effects of tip clearance between rotor tip and duct on the characteristics of fans. The tested results are compared with the computation based on the finite volume method to solve the Navier-Stoke equations with $textsc{k}$-$\varepsilon$ turbulence model. The comparison shows good agreements between experimental and computational results. In addition, the effects of shape of guide vanes are numerically studied. The results show that increased volume of separated region around the guide vane reduces the recovery of tangential component of kinetic energy in the wake, resulting in loss of efficiency

Optimal Design of Guide Vane for Improvement of Heat Removal Performance of Electric Vehicles Battery Using Genetic Algorithm (유전 알고리즘을 활용한 전기 자동차 배터리 방열성능 향상을 위한 가이드 베인 최적설계)

  • Song, Ji-Hun;Kim, Youn-Jea
    • Journal of Auto-vehicle Safety Association
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    • v.14 no.1
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    • pp.55-61
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    • 2022
  • Along with global environmental issues, the size of the electric vehicle market has recently skyrocketed. Various efforts have been made to extend mileage, one of the biggest problems of the electric vehicles, and development of batteries with high energy densities has led to exponential growth in mileage and performance. However, proper thermal management is essential because these high-performance batteries are affected by continuous heat generation and can cause fires due to thermal runaway phenomena. Therefore, thermal management of the battery is studied through the optimal design of the guide vanes, while utilizing the existing battery casing to ensure the safety of the electric vehicles. A battery from T-company, one of a manufacturer of the electric vehicles, was used for the research, and the commercial CFD software, ANSYS CFX V20.2, was used for analysis. The guide vanes were derived through optimal design based on a genetic algorithm with flow analysis. The optimized guide vanes show improved heat removal performance.

Comparative Study of Near-Wall Treatment Methods for Prediction of Heat Transfer over Gas Turbine Nozzle Guide Vane (가스터빈 노즐 베인의 열전달 예측을 위한 벽면처리법 비교연구)

  • Bak, Jeonggyu;Kim, Jinuk;Lee, Seawook;Gang, Youngseok;Cho, Leesang;Cho, Jinsoo
    • Transactions of the Korean Society of Mechanical Engineers B
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    • v.38 no.7
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    • pp.639-646
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    • 2014
  • The comparative analysis of near-wall treatment methods that affect the prediction of heat transfer over the gas turbine nozzle guide vane were presented. To achieve this objective, wall-function and low Reynolds number methods, and the transition model were applied and simulated using NASA's C3X turbine vane. The predicted turbine vane surface pressure distribution data using the near-wall treatment methods were found to be in close agreement with experimental data. However, the predicted vane metal temperature and heat transfer coefficient displayed significant differences. Overall, the low Reynolds method and transition model did not offer specific advantages in the prediction of temperature and heat transfer than did the wall-function method. The Reynolds stress model used along with the wall-function method resulted in a relatively high accuracy of prediction of the vane metal temperature and heat transfer coefficient.

Prediction of Cascade Performance of Circular-Arc Blades with CFD

  • Suzuki, Masami;Setoguchi, Toshiaki;Kaneko, Kenji
    • International Journal of Fluid Machinery and Systems
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    • v.4 no.4
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    • pp.360-366
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    • 2011
  • Thin circular-arc blade is often used as a guide vane, a deflecting vane, or a rotating blade of low pressure axial-flow turbomachine because of its easy manufacture. Ordinary design of the blade elements of these machines is done by use of the carpet diagrams for a cascade of circular-arc blades. However, the application of the carpet diagrams is limited to relatively low cambered blade operating under optimum inlet flow conditions. In order to extend the applicable range, additional design data is necessary. Computational fluid dynamics (CFD) is a promising method to get these data. In this paper, two-dimensonal cascade performances of circular-arc blade are widely analyzed with CFD. The results have been compared with the results of experiment and potential theory, and useful information has been obtained. Turning angle and total pressure loss coefficients are satisfactorily predicted for lowly cambered blade. For high camber angle of $67^{\circ}$, the CFD results agree with experiment for the angle of attack less than that for shockless inlet condition.