그린전력을 생산하는 도시형 소형 풍력발전

윤희중 한국물리학회 2016 새물리 Vol.66 No.9

In general, the wind industry has been oriented toward large power systems that require large windy areas and that because of environmental restrictions, should be constructed in regions far away from residential districts. However, recently, small-scale wind generation has moved closer to consumers and now has potential for applications to urban wind power generation with more silent wind turbines. The basic condition for harvesting wind power successfully is, of course, the ability of wind: Hence, an accurate prediction of the wind speed is essential for calculating the electricity output of small wind generators because the output is the basis for its economic performance. In this paper, we review the extent of available data and the progress that has taken place in analysis techniques and tools for determining the wind conditions in urban areas and predict the possibility of applications for the green power generation with small-scale wind turbines. We have paraphrased the hydrodynamic analysis and torque diagrams so citizen might have easy access to green power system. 일반적으로 풍력발전은 날개의 회전면적이 큰 대형풍력발전을 말하며 주위 환경에 신경을 쓰지 않는 주거지역과 멀리 떨어진 지역에 설치되는 발전시설을 말한다. 그러나 최근에는 미풍에도 기동되고 조용하게 운용되는 소형풍력터빈이 개발됨으로 도시지역의 그린전력 생산에 적용할 수 있는 소형풍력 발전 시스템의 적용범위가 확대되고 있다. 풍력발전을 위해서는 설치장소에서 풍속을 정확하게 예측하는 것이 필수적이다. 이를 기반으로 효율성과 경제성을 판단하기 때문이다. 이 논문에서는 도시지역에서 풍력자원과 터빈기술을 효율적으로 활용함으로써 도시지역에서 그린전력 생산가능성을 분석하고 전망한다. 특히 도시지역의 복잡한 풍황조건을 이해하고 분석하는데 필요한 기초적인 유체동역학적 거동과 블레이드가 받는 토크의 벡터연산과정을 도식화하여 일반국민들이 그린전력생산시스템에 쉽게 접근할 수 있게 부연하였다.

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.

수직축 풍력터빈을 위한 풍력타워에서의 속도증가에 대한 실험적 연구

조수용,임채환,최상규,김진균,박성경 한국신·재생에너지학회 2017 신재생에너지 Vol.13 No.4

An experimental study was conducted to augment the performance of VAWTs (vertical axis wind turbine). To enhancethe wind velocity, a wind power tower was applied. The velocities within the wind power tower was measured in a wind tunnel with atest section is 2 m in height and 2.2 m in width. The experiment was conducted with two different velocities according to Reynoldsnumber, 2.1x105 and 1.7x105, based on the length of the guide wall. The measured velocities within the wind power tower werecompared with those measured without a wind power tower. The wind power tower was rotated so that the effect of the wind directionwas considered. Therefore, the velocities within the wind power tower were measured for various azimuth angles. The pressures weremeasured at the upstream and downstream of the wind power tower. The total pressure loss occurred by installing of the wind powertower was estimated. The inner and outer radii of the guide wall were varied to measure the effect depending on the size of the windpower tower. The measured velocity within the wind power tower showed the periodical variation along the azimuth direction. Basedon the near center location where the variation of the velocity was insignificant, the experimental results showed that the wind velocitywas augmented more than 15% by the wind power tower.

수직축 풍력터빈의 기동특성에 관한 수치해석

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.

수직축 풍력터빈의 기동특성에 관한 수치해석

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.

수직축 풍력터빈의 후류 특성에 관한 실험적 연구

정회갑,이승호,권순덕 한국풍력에너지학회 2017 풍력에너지저널 Vol.8 No.1

A study of far wake characteristic of vertical wind turbines is necessary in order to sit them on a wind farm array. Most research has been conducted on flow measurements of near-wake in a vertical wind turbine, but very limited studies are found in far wake model. This study presents quantitative results of wind tunnel tests for far wake field of a Darrieus vertical axis wind turbine. Hot-wire anemometry was used to measure the distribution of mean velocity deficits and turbulence intensities, positioning it behind in distances between 2 and 12 times the diameter of the rotor. In comparison with horizontal axis wind turbine, velocity deficit and wake width of vertical axis wind turbines showed similar trend, and they set apart in two notable characteristics: drift of the lower peak velocity location and acceleration of wind velocity near the rotor.

차량 주행풍을 이용한 풍력발전기의 설계제작

김성미(S. M. Kim),김동희(D. H. Kim),김진희(J. H. Kim),장경락,신병록(B. R. Shin) 대한기계학회 2011 대한기계학회 춘추학술대회 Vol.2011 No.10

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 make a basic design of a cross flow type vertical axis wind turbine driven by vehicle-induced wind and to investigate the turbine performance. A performance improvement of the straight-blad and the estimation of the efficiency of the turbine are described.

2엽 및 3엽 수직축 풍력-태양광 하이브리드 가로등의 발전 중 진동계측을 통한 동적 특성 비교

이진학,박상민,임승률 한국구조물진단유지관리공학회 2019 한국구조물진단유지관리공학회 논문집 Vol.23 No.5

In this study, the vibration characteristics and the resonance phenomena of a wind-solar hybrid light pole structure are compared with respect to the wind turbine type through the dynamic response measurement. Two different turbines are considered including 2-bladed and 3-bladed vertical axis wind turbine rotors. The resonance phenomenon that can occur in hybrid light pole structure is analyzed by comparing the dynamic characteristics of the structure and the excitation force under operational conditions. Displacement responses are also estimated using the acceleration measurement data by use of recently proposed method, and it is observed that the amplitude of dynamic displacement responses are in the range of 4-6 cm under the resonance in the case of 2-bladed turbine and those are limited under 2 mm in the case of 3-bladed turbine because there is no resonance. 이 연구에서는 풍력-태양광 하이브리드 가로등 구조물에 대한 동적 응답을 계측하여, 서로 다른 터빈을 적용하였을 때의 진동 특성 및 공진현상을 비교하였다. 2엽 및 3엽 풍력터빈을 적용하였으며, 하이브리드 가로등이 가지고 있는 진동 특성은 가동 중인 조건에서의 동특성과 가진력을 비교하여 분석하였다. 최근 제안된 방법을 통해 가속도 계측자료를 이용하여 변위 응답을 추정하였고, 2엽 풍력터빈을 적용한 경우 동적 변위 응답의 진폭은 공진 하의 조건에서 4~6cm 범위에 있고, 3엽 풍력터빈을 적용한 경우에는 공진이 발생하지 않아 변위는 2mm 이내로 제한됨을 알 수 있었다.

축소-확대 유로에 적용한 횡류형 수직 풍력발전시스템의 개발

정상훈(Sang-Hoon Chung),정광섭(Kwang-Seop Chung),김철호(Chul-Ho Kim) 대한설비공학회 2011 설비공학 논문집 Vol.23 No.8

New concept of wind energy conversion system is proposed to increase the energy density at a given working space. The quality of wind for wind power generation is depend on its direction and speed. However, the quality is not good on land because wind direction is changeable all the time and the speed as well. The most popularly operated wind turbine system is an axial-flow free turbine. But its conversion efficiency is less than 30% and even less than 20% considering the operating time. In this research, a cross-flow type wind turbine system is proposed with a convergent-divergent duct system to accelerate the low speed wind at the inlet of the wind turbine. Inlet guide vane is also introduced to the wind turbine system to have continuous power generation under the change of wind direction. In here, the availability of wind energy generation is evaluated with the change of the size of the inlet guide vane and the optimum geometry of the turbine impeller blade was found for the innovative wind power generation system.

A Study on the Development of Cross-flow Type Vertical Axis Wind Turbine

황영철(Hwang, Yeong-Cheol),최영도(Choi, Young-Do),김일수(Kim, Ill-Soo),이영호(Lee, Young-Ho) 한국신재생에너지학회 2009 한국신재생에너지학회 학술대회논문집 Vol.2009 No.11

Recently, small vertical axis wind turbine attracts attention because of its clean, renewable and abundant energy resources to develop. Therefore, a cross-flow type wind turbine is proposed for small wind turbine development in this study because the turbine has relatively simple structure and high possibility of applying to small wind turbine. The purpose of this study is to investigate the effect of the turbine‘s structural configuration on the performance and internal flow characteristics of the cross-flow turbine model using CFD analysis. The results show that guide nozzle should be adopted to improve the performance of the turbine. Optimization of the nozzle shape will be key-importance for the high performance of the turbine.