...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Journal of Mechanical Science and Technology >An experimental loading study of a pitching wind turbine airfoil in near- and post-stall regions
【24h】

An experimental loading study of a pitching wind turbine airfoil in near- and post-stall regions

机译：近端和失踪区地区抛光风力涡轮机翼型的实验研究

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

A series of experimental tests was conducted to present an insight into lift characteristics of an oscillating wind turbine airfoil at nearand post-stall regions. Due to the unsteady nature of the flow around a wind turbine, the blades are subjected to oscillating motions and consequently, unsteady phenomena occur, dynamic stall in particular. Therefore, the unsteady lift of wind turbine blades is of considerable importance in performance and estimation of a wind turbine lifespan. In the current study, at Re = 420000, a detailed survey of parameters affecting lift characteristics in the hysteresis loops are carried out for the critical section of a 660 kW wind turbine blade. To investigate the effects of reduced frequency, mean angle of attack (AOA) and amplitude of oscillation, the characteristics of lift hysteresis loops including maximum lift, width of the loop, crossover point (if exists) and the normal force defect (NFD) are compared qualitatively and quantitatively. The results indicate that increase of reduced frequency leads to decrease in lift curve slope and delay in maximum lift occurrence. Furthermore, the lift curves are the evidence of strong dependence of lift characteristics on mean AOA and amplitude of pitching motion. Increase of amplitude makes the airfoil enter the post-stall region and hence, it delays the maximum lift occurrence. Entering the post-stall region, the airfoil encounters deeper dynamic stall. Also, approaching to post-stall region makes the clockwise part of the loops more dominant.
机译：进行了一系列实验试验，以欣赏到接近后失速区的振荡风力涡轮机翼型的提升特性。由于风力涡轮机周围的流动的不稳定性，因此叶片经受振荡运动，因此，特别地发生不稳定的现象。因此，风力涡轮机叶片的不稳定升降在风力涡轮机寿命的性能和估计方面具有相当重要的重要性。在目前的研究中，在RE = 420000，对影响磁滞回路中的提升特性的参数进行详细调查，用于660kW风力涡轮机叶片的临界部分。为了研究频率降低，平均攻角（AOA）和振荡幅度的影响，提升磁滞回路的特性包括最大升力，环路宽度，交叉点（如果存在）和正常力缺陷（NFD）是定性和定量比较。结果表明，减小频率的增加导致升力曲线斜率降低和最大升力发生的延迟。此外，升力曲线是提升特性在平均AOA和俯仰运动的幅度上强烈依赖的证据。振幅的增加使翼型进入停滞区域，因此，它延迟了最大升力发生。进入失速区，翼型遭遇更深的动态摊位。而且，接近停滞区域使得循环的顺时针部分更大。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号