【作者】 张鑫；

【导师】 王春华；

【作者基本信息】 辽宁工程技术大学 ， 机械工程， 2015， 硕士

【摘要】 叶片的大型化,不仅提高了风机的效能,更降低了单位发电量的发电成本。发展风力发电技术对于当今能源行业来说势在必行,随着风机技术的不断完善和发展,机组装机容量也不断增长,这就要求风机叶轮的捕风面积不断扩大,叶轮的捕风面积与叶片半径的平方约成正比关系,叶片长度增加一倍,风机的捕风面积可以比原来的风机增加三倍。叶片尺寸的增加,使得叶片的质量对叶片的设计提出了更高的要求。本文介绍了风力发电机的主要分类和基本工作原理,讨论了用于进行风机叶片设计的基本数学理论模型,基于这些基本模型,得出叶片设计的一般方法。分析了风机在运行过程中所受的载荷来源以及理论计算,基于数学基本理论,计算了设计工况下风机(1.5MW, NACA-4412翼型)的叶片基本几何参数,通过Profili叶片设计软件求得NACA-4412翼型的上下表面坐标,结合风机理论求出的实际翼弦和扭角,将其转换为设计需要的尺寸,进一步通过坐标变换模型,将二维数据点转移到三维空间。利用Solidworks强大的曲面三维空间造型功能,对设计的叶片进行三维建模,通过Simulation算例分析,对叶片三维模型进行应力、应变、以及振动模态的分析。利用M ATLAB对叶片展向的弦长以及扭角进行拟合改进,得到拟合公式,对拟合改进后的叶片进行铺层设计,重新建模,与原有叶片对比分析应力应变、振动模态分布情况,改进的模型能够保证叶片基本力学性能,实现了大型叶片的轻量化设计的目的。更多还原

【Abstract】 Enlarging the length of the blade,not only can improve the efficiency of the fan,but also can reduce the cost per unit power generation. Development of wind power generation technology is imperative for today’s energy industry. With the development and improvement of fan technology,unit installed capacity is also growing,which requires the area of wind wheel expanding,the area is directly proportional to the radius’ square,blade length becomes double,the area can be three times more than the original fan. But the increasement of blade length puts forward higher requirements to the design of blade.This paper discusses the main classification and basic working principle of wind turbines, on the basis of knowledge about wind turbine blade and rotor essential parameter, make further analysis of these parameters’ effect on the fan operation efficiency.Discusse the basic mathematical theory model for blade design, include Batz theory, Glauert eddy theory. Although these basic theories are derived from the compact wind turbines, but they still have guiding significance for modern large fan design.Analyze the load sources during the fan operating process and theoretical calculation, based on the mathematic basic theory, calculate the blade’s basic geometric parameters under the design conditions (1.5 MW, the NACA-4412), obtain the airfoil surface coordinates by Profili blades design software, combining the theory of the fan,acquire the actual chord and torsional angle, convert them into the size for design, further, by coordinate transformation model, transfer the two-dimensional data points to three dimensional space.Use Solidworks powerful surface modelling function in three-dimensional space, carry out three-dimensional model. was on the design of vane, through simulation analyses the blade stress and strain, and the vibration modal analysis.Take advantage of Matlab to optimize the blade chord’s length and torsional angle, acquire the optimization formula, design the optimized blade’s layer, compared with the original blade analysis. the optimizated model is economic and reasonable, on the promise of guarantee the blade basic performance, achieve the lightweight design of large blade.更多还原