【作者】 李银然；

【导师】 李仁年；

【作者基本信息】 兰州理工大学 ， 流体机械及工程， 2010， 硕士

【摘要】 随着科学技术的发展,能源需求的日益增大,环境保护问题也迫在眉睫。风能作为一种洁净的可再生环保能源以其独特的优越性越来越受到社会的重视。风力机发电是利用风能的主要形式,叶片是风力发电机吸收风能的重要部件,而翼型又是叶片设计的最基本要素,因此,对风力机翼型的研究是当前风力机空气动力学研究的一个热点,也是风力机研究的基础。本文首先在分析国内外风电开发现状、风力机翼型研究现状的基础上,对风力机翼型的空气动力学的基本理论做了详细的介绍,包括翼型的几何特性,传统风力机翼型系列和风力机专用翼型系列等,并对各种系列翼型的空气动力特性进行了描述。其次以提高计算精度为目标,对数值计算中涉及到的湍流模型、网格划分方式、离散格式等,进行了比较性研究,找到了一种较为合理的搭配方式,用这种计算方式对不同展向长度的直叶片进行了数值计算,以研究三维效应对翼型气动性能的影响。第三,在数值计算中,发现附体流动时翼型升阻力监测曲线有波动现象,而且波动的幅度随着攻角的增加而增加,分析引起该现象的原因,并逐一进行验证计算,结果发现后缘厚度过大是引起该现象的主要原因,故对原翼型后缘做了三种改型计算,结果表明,减小后缘厚度的确会减小升阻力监测曲线的波动幅度,而增加后缘厚度将增大波动幅度。最后,利用Gurney襟翼来分析翼型受力的波动现象。更多还原

【Abstract】 With the development of science and technology,energy demand is ever-increasing. At the same time, Environment protection is an important problem that we must faced to.Wind energy as a clean green renewable energy is recognized by the society for its unique advantages.Adopting wind turbine to generate electricity is the major form of using wind energy to deal with above problem.The blades of Wind turbine is an important component of the wind turbine to absorb wind energy,the airfoil is the key assembly of the blades. So the design method research of wind turbine airfoils is a hot and the basic investigation the wind turbines in the study of aerodynamics nowadays.In this paper,on the basis of analysis the development status of domestic and foreign wind power and dedicated airfoils for wind turbines firstly,the basic theory of aerodynamics of wind turbine airfoils were described in detail,including the geometric characteristics of airfoils, the traditional and dedicated wind turbine airfoil series, and various series of airfoil aerodynamic characteristics are described. Secondly,with the aim of improve the accuracy of numerical calculation involved in turbulence models,mesh methods,discrete format,comparative study was conducted to find a more reasonable way, using this formula on different spanwise length of the straight blade has been calculated to study the three-dimensional effect on airfoil performance.Thirdly, during the numerical calculation,it was found that in the attached state flow airfoil life and drag curve fluctuation monitoring,but also fluctuated with the increase of the angle of attack, analysis of the reasons causing the phenomenon,and one by one to verify the calculationfound that excessive trailing edge thickness is the main reason causing the phenomenon, so did the original airfoil trailing edge, three modified calculation, the results show that the reduced trailing edge thickness would indeed reduce the drag and lift curve of the fluctuation monitoringand increased edge thickness will increase volatility.Finally,Gurney flap used to analyze the phenomenon of fluctuations for lift and drag of airfoil.更多还原