空气动力学学报2024，Vol.42Issue(10)：40-49,10.DOI:10.7638/kqdlxxb-2023.0175
风力机翼型尾缘迎风降载工况挥舞振动风洞试验研究
Wind tunnel experimental study on flapping vibration of wind turbine airfoil trailing edge under windward load reduction conditions
摘要
Abstract
Shutdown and individual pitch for load reduction are important measures to ensure the structural safety of large wind turbines in extreme typhoon weather.When the blade trailing edge faces the wind(180° angle of attack),the aerodynamic coefficient of the airfoil is relatively small.This indicates that the trailing edge windward condition is favorable for load reduction.However,unfavorable vibrations exist in the flapwise direction under this condition.Based on wind tunnel experiments,this paper investigates the aeroelastic characteristics of three different typical wind turbine airfoils(DU00-W2-401,DU91-W2-250,and NACA64618)under the condition of the trailing edge windward load reduction.The study measures the flapwise displacement of the different airfoils at various wind speeds in the trailing edge windward condition.It is discovered that airfoils with different cross-sections of the blade exhibit flapwise vibrations at a specific flow angle of attack and reduced structural frequency.Specifically,the overall range of unstable angle of attack is from 155°to 167°.The instability region forms an inverted"V"shape,where the unstable angle of attack range increases as the reduced frequency decreases.This type of flapwise vibration exhibits frequency lock-in characteristics,meaning that the vibration frequency becomes locked to the first flapwise mode natural frequency of the structure.Additionally,the vibration amplitude increases as the structural reduced frequency decreases,and the maximum peak-to-peak vibration exceeds the chord length of the airfoils.For modern wind turbine blades with a pre-torsion design,it is advisable to minimize the occurrence of the main blade section entering the sensitive angles of flapwise instability during the trailing edge windward load reduction condition to prevent structural damage.关键词
气动弹性/风洞试验/降载/尾缘迎风/挥舞振动Key words
aeroelasticity/wind tunnel experiment/load reduction/trailing edge windward/flapwise vibration分类
信息技术与安全科学引用本文复制引用
李德宁,高传强,骆府庆,张伟伟..风力机翼型尾缘迎风降载工况挥舞振动风洞试验研究[J].空气动力学学报,2024,42(10):40-49,10.基金项目
国家重点研发计划(2023YFB4203401) （2023YFB4203401）
陕西省自然科学基础研究计划资助项目(2024JC-TBZC-17) （2024JC-TBZC-17）
