空气动力学学报2024，Vol.42Issue(3)：55-68,14.DOI:10.7638/kqdlxxb-2023.0022
风力机翼型S809绕流流动特性的POD和DMD对比分析
Comparative analyses of unseady flow fields around wind turbine airfoil S809 using POD and DMD
摘要
Abstract
The flow separation remarkbaly undermines wind turbines'aerodynamic performance thus requires.In order to develop flow control strategies,fundelmental research on the unsteady flow separation is abosutely necessary,and the Reduced-Order Model(ROM)methods offers a tool.In this paper,the unsteady flow fields around S809,a typical horizontal axis wind turbine airfoil,at deep and shallow stall angles of attack are obtained numerically and further analyzed by proper orthogonal decomposition(POD)and dynamic mode decomposition(DMD).Results show that POD and DMD can accurately capture the unsteady flow structures and dominant modes,but the former,based on magnitude of energy,ignores the flow structure with similar lift main frequency but less energy.DMD can accurately capture the flow field evolution(rate of increase,frequency,etc.)and develop targeted flow control strategies for the dominant frequency structure,offering the airfoil flow field conditions and aerodynamic performance.关键词
风力机翼型绕流/计算流体力学/降阶模型/本征正交分解/动态模态分解Key words
wind turbine airfoil flow/unsteady flow separation/reduced-order model/proper orthogonal decomposition(POD)/dynamic mode decomposition(DMD)分类
能源科技引用本文复制引用
李凯迪,孙晓晶..风力机翼型S809绕流流动特性的POD和DMD对比分析[J].空气动力学学报,2024,42(3):55-68,14.基金项目
国家自然科学基金面上项目(52176194) （52176194）
