风力机翼型气动性能及流固耦合分析

发布时间：2018-03-16 02:21

本文选题：风力发电机　切入点：气动性能　出处：《湘潭大学》2015年硕士论文　论文类型：学位论文

【摘要】：风力发电机工作的过程中,叶片作为转换能量的重要部件时刻都和流场发生着交互作用,因此,风力机叶片气动性能的好坏直接决定着其风能利用效率的高低。对于叶片而言,流场特性的变化,又对叶片产生了时刻变化的气动载荷。新产生的气动载荷再次使叶片发生形变,如此反复。这种叶片结构和流场之间的相互作用对风力机的安全平稳运行构成重大威胁;对于流场而言,由于交互作用而产生的叶片变形,会使流场的流动特性发生改变,而这对大型风电场中风电机组间的高效运转来说尤为重要。由此可见,对叶片的气动性能、结构振动特性及流场特性的研究显得至关重要。本文基于ANSYS Workbench多物理场仿真平台,采用CFX双向流固耦合的方法,以10kW三叶片风力机为研究对象,对其翼型气动性能、振动特性以及流场特性进行研究。主要研究内容如下:1.借助CFX软件对小型风力机专用SG6040翼型的气动性能进行模拟计算,分析不同湍流模型对翼型近壁面流体流动的影响,以及雷诺数对翼型升力系数、阻力系数、流动分离特性和失速特性等的影响。2.基于Workbench平台对柔性叶片的结构分析及单、双向流固耦合进行分析,研究预应力对叶片结构模态和相应振型的影响,并分别探讨风压预应力及旋转预应力分别对其振动频率的影响。3.采用双向流固耦合分析的方法,对风轮所在流场进行流动特性分析,并对风力机尾迹流场特性进行研究,以期对大型风电场中风力机组的优化布置起到一定的指导意义。
[Abstract]:In the working process of wind turbine, blade, as an important component of energy conversion, interacts with the flow field at all times. Therefore, the aerodynamic performance of wind turbine blade directly determines the wind energy utilization efficiency. With the change of flow field characteristics, the aerodynamic load of the blade changes at all times, and the new aerodynamic load causes the blade to deform again. The interaction between the blade structure and the flow field poses a major threat to the safe and smooth operation of the wind turbine; for the flow field, the blade deformation resulting from the interaction changes the flow characteristics of the flow field. This is especially important for the efficient operation of wind turbines in large scale wind farms. Thus, it is very important to study the aerodynamic performance, structural vibration characteristics and flow field characteristics of blades. This paper is based on ANSYS Workbench multi-physical field simulation platform. The aerodynamic performance of a 10 kW three-blade wind turbine is studied by using CFX two-way fluid-solid coupling method. Vibration characteristics and flow field characteristics are studied. The main contents are as follows: 1. The aerodynamic performance of special SG6040 airfoil for small wind turbine is simulated by using CFX software, and the influence of different turbulence models on the flow near the wall of airfoil is analyzed. The influence of Reynolds number on lift coefficient, drag coefficient, flow separation characteristic and stall characteristic of airfoil. 2. Based on Workbench platform, the structure analysis of flexible blade and the analysis of single and bidirectional fluid-solid coupling are carried out. The influence of prestress on the modal and vibration modes of blade structure is studied, and the influence of wind pressure prestress and rotation prestress on the vibration frequency is discussed respectively. 3. The bidirectional fluid-solid coupling analysis method is used. The flow characteristics of wind turbine are analyzed and the characteristics of wind turbine wake flow field are studied in order to guide the optimal arrangement of wind turbine in large scale wind farm.
【学位授予单位】：湘潭大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TM315

【参考文献】