摘要
为了了解不同材料风力机叶片在风向变化过程中的应力变化规律,以木质、玻璃纤维和碳纤维材料的S型风力机叶片为研究对象,使用风洞及动态旋转平台模拟风向变化情况并通过试验方法进行研究.结果表明:在同风速、同尖速比条件下,弹性模量较大的碳纤维叶片叶根前缘处应力值远大于玻璃纤维叶片和木质叶片叶根前缘处应力值,重量较大的玻璃纤维叶片比碳纤维叶片和木质叶片叶根前缘处应变值大;不同材料叶片叶根及展向应力、应变分布有所不同,但总体基本呈现由前缘(0.25C)向后缘(0.90C)、由叶根(0.20R)向叶尖(0.90R)减小的趋势;风向变化开始后,刚度高的碳纤维叶片由于抵抗弹性变形的能力强,其各测点应力、应变值最先出现明显下降趋势,之后依次为玻璃纤维叶片和木质叶片,3种材料叶片各测点的应力、应变值均呈现反S型下降曲线;叶片材料不同会导致同翼型同一测点处受到拉伸或挤压作用的大小、最大主应力方位角出现较大差异.
In order to understand the stress changes of wind turbine blades with different materials du-ring the process of wind direction change,S-shaped wind turbine blades with wood,glass fiber,and carbon fiber materials were used as the research object.Wind tunnels and dynamic rotating platforms were used to simulate the wind direction changes and experimental methods were used for research.The results show that under the same wind speed and the same tip speed ratios,the stress value at the lea-ding edge of the blade root of carbon fiber blade with larger elastic modulus is much higher than that of glass fiber blades and wood fiber blades.The strain value at the leading edge of the blade root of the glass fiber blade with larger weight is much higher than that of the carbon fiber blades and wood fiber blades.The distribution of root and spreading stress and strain of different materials is different,but the overall trend shows basic decrease from leading edge(0.25 C)to trailing edge(0.90 C)and from root(0.20 R)to tip(0.90 R).At the beginning of wind direction changes,the stress and strain values of carbon fiber blades with high stiffness show an obvious downward trend at each measuring point due to their strong resistance to elastic deformation,followed by glass fiber blades and wood blades.The stress and strain values at each measuring point of the three material blades show an inverse S-shaped downward curve.Different blade materials can lead to significant differences in tensile or extrusion action and azimuth of maximum principal stress at the same airfoil and the same measuring point,which result in significant differences in the maximum principal stress azimuth.
作者
汪建文
赵煜
张鹏
任彪
尹九俊
WANG Jianwen;ZHAO Yu;ZHANG Peng;REN Biao;YIN Jiujun(College of Energy and Power Engineering,Inner Mongolia University of Technology,Hohhot,Inner Mongolia 010051,China;Key Laboratory of Wind and Solar Energy Utilization Mechanism and Optimization in Inner Mongolia Autonomous Region,Hohhot,Inner Mongolia 010051,China;Key Laboratory of Wind Energy and Solar Energy Technology,Ministry of Education,Hohhot,Inner Mongolia 010051,China)
出处
《排灌机械工程学报》
CSCD
北大核心
2024年第3期273-281,共9页
Journal of Drainage and Irrigation Machinery Engineering
基金
国家自然科学基金资助项目(51766014)
内蒙古自治区重点基础研究开放课题。
关键词
小型风力机
风向变化
叶片材料
应力分析
small wind turbine
wind direction change
blade material
stress analysis
