• Title/Summary/Keyword: Blade aerodynamic design

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Aerodynamic characteristics of a small vertical axis wind turbine with dual blade type (이중 날개 형태의 소형 수직축 풍력터빈의 공기 역학적 특성)

  • Park, Byungho;Kim, Jongsik;Lim, Jongho;Ehim, Jongbin;Lee, Seungho;Lee, Jinhyun
    • 한국신재생에너지학회:학술대회논문집
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    • 2011.05a
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    • pp.63.2-63.2
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    • 2011
  • The objective of this study is to investigate the aerodynamic characteristics of a small vertical axis wind turbine with dual blade type. The Wind turbine with dual blade has various angle of attack. so this turbine improve starting characteristics. The various arrangement of the vertical axis wind turbine with dual blade is designed. Among them, it shows superior quality that is arranged in three rows. Among arrangement in three rows, we use general computational fluid dynamics program CFX to find out the optimal arrangement. By comparing the predicted results of the aerodynamic characteristics of the different arrangement of the blades, an appropriate arrangement of the blade is suggested to design the small wind turbine blade.

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A Study on Manufacturing and Structural Test of Wind Turbine System Blade using Natural Composite (자연섬유 복합재료 풍력 발전 시스템 블레이드 제작 및 구조 시험 연구)

  • Park, Hyun Bum
    • Journal of Aerospace System Engineering
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    • v.11 no.4
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    • pp.30-35
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    • 2017
  • In this work, a manufacturing and structural test of 1kW class horizontal axis wind turbine blade using natural-fiber composite was performed. The aerodynamic design of blade was performed after investigation on design requirement. The structural design load was investigated after aerodynamic design of blade. And also, structural design of blade was carried out. The structural design of blade was carried out using the simplified methods such as the netting rule and the rule of mixture applied to composite. The structural safety of the designed blade structure is investigated through the various load cases, stress, deformation and buckling analyses using the FEM method. Finally, the blade manufacturing and structural test using natural composite was carried out.

A Computerized Design System of the Axial Fan Considering Performance and Noise Characteristics (성능 및 소음특성을 고려한 축류 팬 설계의 전산 체계)

  • Lee, Chan;Kil, Hyun-Gwon
    • The KSFM Journal of Fluid Machinery
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    • v.13 no.2
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    • pp.48-53
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    • 2010
  • A computerized design system of axial fan is developed for constructing 3-D blade geometry and predicting both aerodynamic performance and noise. The aerodynamic blading design of fan is conducted by blade angle distribution, camber line determination, airfoil thickness distribution and blade element stacking along spanwise distance. The internal flow and the aerodynamic performance of designed fan are predicted by the through-flow modeling technique with flow deviation and pressure loss correlations. Based on the predicted internal flow field and performance data, fan noise is predicted by two models for discrete frequency and broadband noise sources. The present predictions of the flow distribution, the performance and the noise level of actual fans are well agreed with measurement results.

A Study on Design and Test for Composite Blade of Small Scale Wind Turbine System (소형 풍력발전 시스템용 복합재 블레이드의 설계 및 시험에 관한 연구)

  • Kong Changduk;Bang Johyug;Park Jongha;Oh Kyungwon
    • Proceedings of the Korean Society For Composite Materials Conference
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    • 2004.10a
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    • pp.125-130
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    • 2004
  • This study proposes a development for the l-kW class small wind turbine system, which is applicable to relatively low wind speed region like Korea and has the variable pitch control mechanism. In the aerodynamic design of the wind turbine blade, parametric studies were carried out to determine an optimum aerodynamic configuration which is not only more efficient at low wind speed but whose diameter is not much larger than similar class other blades. A light composite structure, which can endure effectively various loads, was newly designed. In order to evaluate the structural design of the composite blade, the structural analysis was performed by the finite element method. Moreover both structural safety and aerodynamic performance were verified through the prototype test.

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AERODYNAMIC DESIGN AND PERFORMANCE PREDICTION OF ROTOR BLADES IN A SINGLE-STAGE AXIAL FAN USING CFD METHODS (전산해석기법에 의한 단단 축류팬 동익의 공력설계 및 성능 예측)

  • Kim, E.S.;Chung, H.T.
    • Journal of computational fluids engineering
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    • v.19 no.2
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    • pp.93-98
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    • 2014
  • In the present study, CFD methods are applied in the design procedure of rotor blades in a axial-flow fan and the aerodynamic performances are predicted. The blade profiles initially determined by the free vortex method and empirical formula are modified to match the target value of the rotor work load through the analysis of 3D Navier-Stokes solver. The corrected shapes of the rotor blade showed the increase of the efficiency and the pressure simultaneously.

Aerodynamics Characteristics of Quad-Rotor Blade (쿼드로터 블레이드의 공력특성)

  • Ki, Hyun;Choi, Jong-Wook;Kim, Sung-Cho
    • 한국전산유체공학회:학술대회논문집
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    • 2008.03b
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    • pp.43-46
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    • 2008
  • Quad-Rotor, which consists of four blades, performs a flight task by controling each rotation speed of the four blades. Quad-Rotor blade making no use of cyclic pitch or collective one is a type of fixed-wing as different from helicopter blade. Although, Quad-Rotor is simple and easy to control for those reasons, blade configuration of the fixed wing is one of the critical factors in determining the performance of Quad-Rotor. In the present study, coefficients for thrust and power of Quad-Rotor blade were derived from the data acquired by using 6-component balances. Firstly, Measurements for aerodynamic force were conducted at various pitch angles (i.e., from 0$^{\circ}$ to 90$^{\circ}$ with the interval of 10$^{\circ}$). The blade used in this experiment has aspect ratio of 6 and chord length of 35.5 mm. Secondly, assembled-blade, which was an integral blade but divided into many pieces, was used in order to test aerodynamic forces along twist angles. The curve of thrust coefficient along pitch angle indicates a parabola form. Stall which occurs during wind tunnel test to calculate lift coefficient of airfoil does not generate. When deciding the blade twist angle, structural stability of blade should be considered together with coefficients of thrust and power. Those aerodynamic force data based on experimental study will be provided as a firm basis for the design of brand-new Quad-Rotor blade.

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Basic Configuration Design and Performance Analysis of a 100kW Wind Turbine Blade using Blade Element Momentum Theory (BEMT에 의한 100kW 풍력터빈 블레이드 기본설계 및 출력 성능해석)

  • Kim, Bum-Suk;Kim, Mann-Eung;Lee, Young-Ho
    • Journal of Advanced Marine Engineering and Technology
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    • v.32 no.6
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    • pp.827-833
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    • 2008
  • In this study, mathematical expressions based upon the conventional BEMT(blade element momentum theory) was applied to basic 100kW wind turbine blade configuration design. Power coefficient and related flow parameters, such as Prandtl's tip loss coefficient, tangential and axial flow induction factors of the wind turbine were analyzed systematically. X-FOIL was used to acquire lift and drag coefficients of the 2-D airfoils and Viterna-Corrigan formula was used o interpolate he aerodynamic characteristics in post-stall region. Also, aerodynamic characteristics, measured in a wind tunnel to calculate he power coefficient was applied. The comparative results such as axial and tangential flow factors, power coefficients were presented in this study. Power coefficient, calculated by in-house code was compared with the GH-Bladed result. The difference of the aerodynamic characteristics caused the difference of the performance characteristics as variation as TSR.

Aerodynamic Load Analysis at Hub and Drive Train for 1MW HAWT Blade (1MW급 풍력 터빈 블레이드의 허브 및 드라이브 트레인 공력 하중 해석)

  • Cho Bong-Hyun;Lee Chang-Su;Choi Sung-Ok;Ryu Ki-Wahn
    • 한국신재생에너지학회:학술대회논문집
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    • 2005.06a
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    • pp.25-32
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    • 2005
  • The aerodynamic loads at the blade hub and the drive shaft for 1MW horizontal axis wind turbine are calculated numerically. The geometric shape of the blade such as chord length and twist angle can be obtained fran the aerodynamic optimization procedure. Various airfoil data, that is thick airfoils at hub side and thin airfoils at tip side, are distributed along the spanwise direction of the rotor blade. Under the wind data fulfilling design load cases based on the IEC61400-1, all of the shear forces, bending moments at the hub and the low speed shaft of the drive train are obtained by using the FAST code. It shows that shear forces and bending moments have a periodic. trend. These oscillating aerodynamic loads will lead to the fatigue problem at both of the hub and drive train From the load analysis the maximum shear forces and bending moments are generated when wind turbine generator system operates in the case of the extreme speed wind condition.

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Aerodynamic Optimization of Helicopter Blade Planform (II): Applications to Design Optimization (헬리콥터 블레이드 플랜폼 공력 최적설계(II): 최적설계 기법의 적용)

  • Kim, Chang-Joo;Park, Soo-Hyung;Shin, Ki-Cheol;Kim, Seung-Ho;Chung, Ki-Hoon;Kim, Seung-Bum
    • Journal of the Korean Society for Aeronautical & Space Sciences
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    • v.38 no.11
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    • pp.1060-1066
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    • 2010
  • This paper focuses on the application of the proposed aerodynamic optimization techniques to design the blade planform of helicopter rotors. The design problems are formulated to maximize the hover figure of merit and the equivalent lift-to-drag ratio for high forward speed by optimally distributing airfoils, twist, and chord along the blade span. The numerical characters are investigated by solving various design problems. The advantages and limitations with the present design approach and the present modeling features for performance prediction are discussed. The recommendations for the required model refinements to get more accurate optimal configurations are addressed as future research areas.

Effects of Incidence Angle on the Three-Dimensional Flow and Aerodynamic Loss Downstream of a High-Turning Turbine Rotor Blade (입사각이 고선회 터빈 동익 하류에서의 3차원 유동 및 압력손실에 미치는 영향)

  • Chae, Byoung-Joo;Lee, Sang-Woo
    • Proceedings of the KSME Conference
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    • 2007.05b
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    • pp.2591-2596
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    • 2007
  • The effect of incidence angle on the three-dimensional flow and aerodynamic loss in the downstream region of a high-turning turbine rotor blade has been investigated with a straight miniature five-hole probe. The incidence angle is changed to be +10, +5, 0, -10, -20, -30 and -40 degrees. The results show that the positive incidence reinforces the three-dimensional vortical flows within the turbine passage including the passage vortex, but the negative incidence weaken them significantly. A small increment in the positive incidence angle results in a remarkable aerodynamic loss increase, while increasing the incidence angle in the negative range leads to a very small change in the aerodynamic loss.

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