基于不同CFD建模复杂度的垂直轴风力机气动性能分析  

AERODYNAMIC PERFORMANCE ANALYSIS OF VERTICAL AXIS WIND TURBINES BASED ON DIFFERENT CFD MODELING COMPLEXITIES

作　　者：何娇 金鑫[2] 谢双义[2] 刘龙 曹乐[2] He Jiao;Jin Xin;Xie Shuangyi;Liu Long;Cao Le(School of Mechanical and Power engineering,Chongqing University of Science and Technology,Chongqing 401331,China;College of Mechanical Engineering,Chongqing University,Chongqing 400044,China;No.650 Institute,AVIC Hongdu Aviation Industry Group,Nanchang 330024,China)

机构地区：[1]重庆科技学院机械与动力工程学院,重庆401331 [2]重庆大学机械工程学院,重庆400044 [3]航空工业洪都集团南昌飞机设计所,南昌330024

出　　处：《太阳能学报》2021年第12期150-156,共7页Acta Energiae Solaris Sinica

基　　金：国家自然科学基金(51975066,51005255);重庆市基础与前沿研究计划一般项目CQCSTC(cstc2013jcyja900118)。

摘　　要：通过将计算流体力学(CFD)与实验结果比较,研究2D URANS、2.5D URANS、2.5D LES和3D URANS CFD建模技术在风力机气动性能分析中的准确性和可行性。与SST k-ω方法相比,LES模型可更准确地模拟垂直轴风力机在动态失速工况下的气动性能。2.5D LES模拟结果的显著改善表明:叶尖涡的忽略可能不是2D URANS和2.5D URANS过高预测功率输出的主要原因,而可能是由其方程存在的内部缺陷导致的。考虑到模型的计算精度和计算成本,2.5D LES可被认为是研究风力机气动性能的一种有效方法,特别适用于垂直轴风力机启动工况的仿真。Computational fluid dynamics(CFD)is an effective method to study the aerodynamic performance of vertical axis wind turbines(VAWTs). At present,the two-dimensional(2 D)Unsteady Reynolds Average Navier Stokes(URANS)method has been widely used to analyze the aerodynamic performance of VAWTs,but its accuracy is limited. In this paper,the accuracy and feasibility of the 2 D URANS,2.5 D URANS,2.5 D LES and 3 D URANS CFD modeling techniques are studied for wind turbine aerodynamic performance analyses by comparing with the experimental results. Compared with the SST k-ω method,the LES method can provide more accurate results under the dynamic stall conditions. The significant improvement of the 2.5 D LES simulation results show that the neglect of blade tip vortices may not be the main reason for the excessive prediction power of both 2 D and 2.5 D URANS,but may be due to the internal defects of the equation. Considering the calculation accuracy and cost of both 2.5 D LES and 3 D URANS models,2.5 D LES can be regarded as an effective method to study the aerodynamic performance of VAWTs,especially for the start-up condition of VAWTs.

关 键 词：计算流体力学 建模技术 风力机 垂直轴 气动性能 功率输出 

分 类 号：O325[理学—一般力学与力学基础] TK79[理学—力学]