报告题目:Kinematics and Aerodynamics: Deep Dynamic Stall in Heaving and Pitching Airfoil
报告人:Kyung Chun Kim(Pusan National University 国立釜山大学)
报告时间:2017年9月14日 下午3:00
报告地点:C12号楼619会议室
主办单位: 国际合作交流处、科协、航空宇航学院
报告人简介:Kyung Chun Kim博士是韩国国家工程院院士,韩国流动显示技术协会主席,在韩国国立釜山大学与国际多所大学担任过教学与研究工作。他长期从事流动可视化相关问题的研究,是2010年在韩国大邱举行的第14届国际流动可视化研讨会的主席。第12届国际粒子影像测量学研讨会的主席。先后发表学术论文570余篇,是《Journal of Visualization 》、《 Journal of Flow Visualization and Image Processing》杂志主编。
报告内容简介Kinematics changes flow characteristics substantially. This talk presents deep dynamic stall behavior under heaving and pitching motions of NACA0012 airfoil. The effective angle of attack is the same for both motion. Large Eddy Simulation has conducted to find 3D flow structures and aerodynamic properties. The Reynolds number used in this study (Re=135,000) is in the same order of magnitude as those for medium and small size wind turbines, but is at least one order of magnitude lower than those for the large-scale wind turbines. The thickness of domain (foil span) is selected one chord length. The outer boundaries are selected based on the above descriptions far away enough to neglect blockage effect. The total number of nodes for the final design is 2.9×106 and 500 nodes are placed along the foil and are clustered close to the leading and trailing edges. It is shown that the flow pattern in boundary layer and wake zone will change if the kinematic of airfoil switches from pure heaving to pure pitching. Additionally, some significant differences between aerodynamic loads are observed for aforementioned kinematics. Particle image velocimetry measurements were carried out to validate the CFD results for lower Reynolds number cases (Re=90,000 and 15,000). It is found that Reynolds number effect is closely related to the formation of 3D vortex structures.