摘要
结合风力机特点,运用量纲分析法推导出风力机气动相似准则为相对粗糙度准则、雷诺数准则和尖速比准则;针对缩模实验叶片表面粗糙度难以相似的实际状况,提出了设计粗糙不敏感叶片的解决方法;通过分析雷诺数与尖速比准则的关系可知,在风洞进行缩模实验难以同时保证运动相似和动力相似,从而提出对引起风力机三维流动的叶尖涡、展向流动等因素随雷诺数变化,对气动性能的影响和产生雷诺数效应的探索是解决风力机气动相似问题的关键。
According to wind turbine characteristics, the dimensional analysis was used to derive wind turbine aerodynamic similarity criteria, which included relative surface roughness criterion, Reynolds criterion and tip speed ratio criterion. It was proposed that designing roughness insensitivity blade was ithe best way to avoid the influences caused by dissimilar blade surface roughness between prototype and its scaled model. Moreover, it was demonstrated that the kinematic similarity and dynamic similar- ity couldn＇ t be simultaneously met through analyzing the relation of Reynolds criterion to tip speed ra- tio criterion. Therefore, investigating the influences of factors, which result in three dimensional flow such as blade tip vortex and span-wise flow, changing with variation of Reynolds number on aerody- namic performance and the effect of Reynolds number will be a key point for solving the problem about aerodynamic similarity of wind turbine.
出处
《可再生能源》
CAS
北大核心
2014年第10期1493-1498,共6页
Renewable Energy Resources
基金
国家自然科学基金资助项目(51366013)
关键词
风力机
气动性能
相似准则
缩模实验
wind turbine
aerodynamic performance
similarity criterion
scaled model test
