多自由度风力机柔性叶片桨涡干扰问题的研究

项目名称： 多自由度风力机柔性叶片桨涡干扰问题的研究

项目编号： No.51506123

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： 沈昕

作者单位： 上海交通大学

项目金额： 20万元

中文摘要： 风力机叶片近场复杂流动和强烈的叶顶叶尖涡是风力机转子近体非定常流场的重要特征。受叶片及塔架柔性形变，浮式风力机组基础、波浪等震荡作用影响，在多自由度运动下柔性叶片及叶尖涡相互耦合的桨-涡效应产生的非定常气动力对风力机的气动性能、载荷特征及气弹、水动力等多物理场耦合作用的稳定性问题有着重要影响。.本项目紧密围绕认识和分析多自由度运动机制下风力机桨-涡干扰问题，桨-涡干扰之后近场粘性叶尖涡破裂、合并、缠绕及耗散的发展机理这一关键科学问题，(1)进行风力机柔性叶片桨-涡干涉问题的理论研究，完成适用于风力机特有流动特征“粘性涡”计算方法；(2) 开展计及叶片柔性的风力机桨-涡干涉问题的实验研究，分析叶片近场流场及叶尖涡的影响尺度；(3) 建立桨-涡干扰分区的多尺度数值计算方法，完成可考虑多自由度运动及叶片柔性特征的风力机气动性能快速计算模型，以满足风力机性能，载荷、气动弹性、控制及振动分析的需要。

中文关键词： 水平轴风力机；桨涡干扰；多自由度；柔性叶片；非定常气动载荷

英文摘要： The strong tip vortices which are released from the tip of the blades and the unsteady aerodynamics of the blade section are two key areas that need serious consideration for the complex unsteady flow feature of wind turbines. The close blade-vortex interaction which results in strong temporal pressure variations has a strong impact on the aerodynamic performance of wind turbine, variation of the rotor blade air-loads and the aeroelastic-hydrodynamic stability for the offshore floating wind turbine system..This project is planned to focus on the understanding and analyzing the mechanism of the multiple degrees of freedom of the wind turbine blade-vortex interaction and the dissipation, diffusion, interaction of the viscous tip vortex during the wake transportation after the blade-vortex interaction, (1) Develop a viscous vortex model for calculating the complicated wind turbine rotor near wake flow field with the vorticity transportation and diffusion based on the theoretically study. (2) Wind tunnel test will be setup to explore the identification method of the flow characteristic for the complicated flow field near the rotor and the strong viscous tip vortex. (3) Develop a fast multi-scale numerical model for the aerodynamic performance prediction of multiple degrees of freedom of wind turbine with flexible blade which can be used for the wind turbine performance, loads, aeroelastic, control and vibration analysis.

英文关键词： horizontal axis wind turbine;blade vortex interaction;multiple degrees of freedom;flexible blade;unsteady airlaods