上海交通大学学报

上海交通大学学报（自然版） ›› 2017, Vol. 51 ›› Issue (7): 805-811.doi: 10.16183/j.cnki.jsjtu.2017.07.006

• 兵器工业 • 上一篇    下一篇

 风力机翼型在大攻角流场下的动力模态分解分析

 刘鹏寅1，2，陈进格1，沈昕1，竺晓程1，杜朝辉1   

  1.  1. 上海交通大学 机械与动力工程学院， 上海 200240；
    2. 上海飞机制造有限公司 理化计量中心， 上海 200436
  • 出版日期:2017-07-31 发布日期:2017-07-31
  • 基金资助:
     

 Analysis of Dynamic Mode Decomposition for
 Wind Turbine Airfoil Flow Field at High Angle of Attack

 LIU Pengyin1，2,CHEN Jinge1,SHEN Xin1,ZHU Xiaocheng1,DU Zhaohui1   

  1.  1. School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China;
    2. Physical and Chemical Metrology Center, Shanghai Aircraft Manufacturing
     Co., Ltd., Shanghai 200436, China
  • Online:2017-07-31 Published:2017-07-31
  • Supported by:
     

摘要：   采用计算流体动力学(CFD)方法，在恒定大攻角工况下，对风力机翼型的非定常流场进行数值模拟，并采用动力模态分解(DMD)方法对其模态进行辨识，以得到非定常流场的频率和相应的主要模态.结果表明：DMD方法可用于分析非定常流场的变化过程；DMD的各阶模态描述了非定常流场的主要流动特征，流场中非定常流动主要集中在近尾迹区域；采用包含主要流动信息的前4阶模态重构的流场能够反映不同时刻的时域流场；第2阶DMD模态重构的流场可以直观地描述尾迹区域内2个方向相反的涡依次脱落并向下游传播的非定常流动特征.

关键词:  , 风力机, 翼型, 动力模态分解(DMD), 非定常

Abstract:  The unsteady flow field is calculated by the computational fluid dynamics (CFD) method, around a wind turbine airfoil at high angle of attack, and its modes are identified by using the dynamic mode decomposition (DMD) method. The dominant modes and corresponding frequencies are obtained. The results show that the DMD method can be used to analyze the changing process of the unsteady flow field; the DMD modes capture the main flow structure of the unsteady flow field, and the main unsteady flow is around the near wake region; the flow field, reconstructed by 4 DMD modes, could describe the original unsteady flow field; the flow field reconstructed by the second DMD mode describe that two vortexes, whose rotating directions are opposite, shed and spread into downstream in turn.

Key words:  wind turbine, airfoil, dynamic mode decomposition (DMD), unsteady

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