沙尘在风力机叶片表面沉积机理研究

项目名称： 沙尘在风力机叶片表面沉积机理研究

项目编号： No.51506072

项目类型： 青年科学基金项目

立项/批准年度： 2016

项目学科： 能源与动力工程

项目作者： 鲁录义

作者单位： 华中科技大学

项目金额： 20万元

中文摘要： 在风沙环境中长期运行的风力机，沙尘等微粒物质可能在风力机叶片表面沉积，使风力机的气动性能下降，并引起风力叶片动平衡变差及叶片材料加速腐蚀、老化等一系列问题。然而，对于沙尘在叶片表面的沉积过程本身，目前还缺乏足够的认识和了解。相关实验研究表明，沙尘的沉积过程与静电有关。本项目拟采用理论分析和数值仿真相结合的方法，对沉积过程中沙尘和叶片的带电行为进行定量研究，通过对风力机气固两相流场进行风-沙-电多向耦合分析计算，研究沙尘颗粒在流场及叶片表面的运动轨迹和受力，分析沙尘沉积过程静电力的作用，探讨沙尘在风力机叶片表面沉积的力学机理，总结沙尘在叶片表面沉积的相关规律，指导风力机风片优化设计和防护，为风沙环境下风力机的长周期高效运行提供理论基础和依据。

中文关键词： 风力机；气固两相流；沙尘沉积；静电；离散单元法

英文摘要： Due to the dust deposition on the surface of the blades,the wind turbine that long-term operates under wind-sand environment will have aerodynamic performance degradation and induce a series of problems,for example, bad blade dynamic balancing, accelerated corrosion and aging of blade materials and so on.But there is a lack of adequate knowledge and understanding for the dust deposition on the surface of the blade.The mechanism of accumulating dust on blades surfaces of horizontal axis-stall regulated wind turbines depends on the otherfactors in site like, sandy storm frequency, wind speed direction surface roughness of blades, topography of site, etc. And, relevant experimental study shows that dust deposition process relates to static electricity. This project intends to adopt combination of theoretical analysis, experimental research and numerical simulation, studying the collision between dust and blade in the process of deposition ,thus obtaining charge transfer model between dust and blades. Based on computational fluid dynamics theory, the discrete element method, the triboelectrification model and the gas solid two phases flow coupling method, the wind-sand movement-electric field coupling model and program will be developed,which is used to simulate the external flow field of baldes under sand-wind environment. The mehcanism of dust deposition on the wind turbine surface could be achived.The study in present project will provide theoretical foundation and basis for efficiently working of a wind turbine under sand-wind environment during long period.

英文关键词： Wind Turbine Blade; Gas-solid Two Phase Flow;Sand Dust Deposition;Electrostatic;Discrete Element Method