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수직축 조류 터빈 발전효율 평가를 위한 유동-터빈 연동 CFD 해석 (II)
이진학(Jin-Hak Yi),오상호(Sang-Ho Oh),박진순(Jin-Soon Park),이광수(Kwang-Soo Lee),이상열(Sang-Yeol Lee) 한국해양공학회 2013 韓國海洋工學會誌 Vol.27 No.3
CFD (computational fluid dynamics) analyses that considered the dynamic interaction effects between the flow and a turbine were performed to evaluate the power output characteristics of two representative vertical?axis tidal?current turbines: an H?type Darrieus turbine and Gorlov helical turbine (GHT). For this purpose, a commercial CFD code, Star?CCM+, was utilized, and the power output characteristic were investigated in relation to the scale ratio using the relation between the Reynolds number and the lift?to?drag ratio. It was found that the power coefficients were significantly reduced when the scaled model turbine was used, especially when the Reynolds number was lower than 105. The power output characteristics of GHT in relation to the twisting angle were also investigated using a three?dimensional CFD analysis, and it was found that the power coefficient was maximized for the case of a Darrieus turbine, i.e., a twisting angle of 0°, and the torque pulsation ratio was minimized when the blade covered 360° for the case of a turbine with a twisting angle of 120°.
정호윤(Ho-Yun Jung),이연원(Yeon-Won Lee),김영덕(Young-Duk Kim) 한국항해항만학회 2008 한국항해항만학회 학술대회논문집 Vol.2008 No.공동학술
The wind turbine system is divided by two types. One is horizontal axis wind turbine and the other is vertical axis wind turbine. Typical types of vertical wind turbine are Darrieus type and Savonius type, etc. The Darrieus type is driven by lift force and Savonius type is driven by drag force. The objective of this study is to investigate the aerodynamic characteristics of a new type vertical axis wind turbine blade as the basic study of a design of a vertical axis wind turbine and to estimate the efficiency of wind turbine.
정호윤(Ho-Yun Jung),이연원(Yeon-Won Lee),김영덕(Young-Duk Kim) 한국마린엔지니어링학회 2008 한국마린엔지니어링학회 학술대회 논문집 Vol.2008 No.-
The wind turbine system is divided by two types. One is horizontal axis wind turbine and the other is vertical axis wind turbine. Typical types of vertical wind turbine are Darrieus type and Savonius type, etc. The Darrieus type is driven by lift force and Savonius type is driven by drag force. The objective of this study is to investigate the aerodynamic characteristics of a new type vertical axis wind turbine blade as the basic study of a design of a vertical axis wind turbine and to estimate the efficiency of wind turbine.
날개 형상이 수직축 풍력터빈의 정지기동특성에 미치는 영향 해석
정호윤,이연원,김영덕 한국풍공학회 2009 한국풍공학회지 Vol.13 No.3
This study is to investigate the 2-dimensional aerodynamic characteristics related to starting torque and to propose the new turbine blade for developing the highly efficient vertical axis wind turbine(VAWT) which is suitable for at low wind speed and not influenced by the direction of the wind. The 6 types of the VAWT blades(based NACA 2312 airfoil) were tested by Computational Fluid Dynamics. It was revealed that starting torque increases like exponential function as wind speed increases. And blade 2 with no flap has the highest starting torque among 6 blades. In blade 1, the efficiency of the blade with flap of 30 degree is higher than other 2 types. 본 연구에서는 바람의 방향이 시시각각 변하고 바람의 세기가 해양이나 고지대에 비하여 낮은 도심지역에 적합한 수직축 고효율 풍력발전시스템에 적용할 블레이드의 형상제안 및 정지기동특성에 대한 이차원해석을 하였다. 해석에 사용된 블레이드 형태는 NACA airfoil(NACA 2312)을 기본으로 하고, 변형된 모델들에 대해 조사하였다. 그 결과 일반적으로 풍속이 증가함에 따라서 토크 값은 지수함수의 형태와 유사하게 증가함을 알 수 있었다. 또한 6케이스 중 플랩이 없는 블레이드 2 타입이 가장 높은 토크값을 나타내었으며, 블레이드 1 타입의 경우는 30° 플랩을 부착한 경우가 가장 우수하였다.
풍력터빈 가속장치에 의한 소형수직축 풍력터빈 주위 유동 수치해석
허진석,이상호,김현아,국민호,전필수,국성규 한국기계기술학회 2015 한국기계기술학회 학술대회논문집 Vol.2015 No.03
In this study, flow characteristic of small vertical-axis wind turbine was performed to analysis the numerical analysis. Blade geometry in the wind turbine is NACA 6512-43, and various degrees of the wind turbine accelerator were adopted. Numerical models are used for the analysis with CFD program of Ansys fluent and RNG k-e turbulence model was used. Rotational speed value of the wind turbine in analysis condition were obtained by the experiment. When the wind turbine accelerator is equipped, exit velocity of wind turbine accelerator tended to increases. Also RPM of wind turbine is increase. And maximum RPM appeared that wind turbine accelerator in degree 60° is equipped.
정호윤(H. Y. Jung),이연원(Y. W. Lee),김영덕(Y. D. Kim) 한국동력기계공학회 2009 한국동력기계공학회 학술대회 논문집 Vol.2009 No.6
The wind power generation system is divided by two types, horizontal axis wind turbine(HAWT) and vertical axis wind turbine(VAWT). The VAWT can be used at low wind speed, and it does not influenced by the direction of the wind. But the efficiency of the VAWT is lower than the HAWT. So, it is necessary to solve this problem. And many researchers make an effort to solve the problem. The objective of this study is to investigate the aerodynamic characteristics of the vertical axis wind turbine blade, and we also compared the torque values of various type of the VAWT blades. In conclusion, the efficiency of the blade type 2 is higher than the blade type 1.
조류발전용 수직축 터빈의 공진 회피 설계를 위한 프로그램 개발
배재한(Jae-Han Bae),성혜민(Hye-Min Seong),조대승(Dae-Seung Cho),김재호(Jae-Ho Kim) 한국소음진동공학회 2012 한국소음진동공학회 학술대회논문집 Vol.2012 No.4
The vertical-axis tidal current turbine (VAT) consisting of blades, struts to support blades, shaft, generator and so forth requires anti-resonance design against fluid fluctuation forces generated on blades to ensure its stable operation. In this study, a free vibration analysis program based on the finite element method is developed for efficient anti-resonance design of VAT in the preliminary design stage. In the finite element modeling, the VAT structure components are regarded as beam elements. Added masses due to the fluid and structure interaction of VAT evaluated by empirical formulas are considered as lumped mass elements. In addition, input parameters required for the analysis can be automatically prepared from the principal dimensions of VAT to make anti-resonance design more convenient. The validity of applied methods is verified by the comparison of the numerical results obtained from MSC/Nastran and the developed program for two VAT models.