Visualization and Experiment of Tip Vortex Phenomenon in Cooling Fan using Digital Particle Image Velocimetry  

作　　者：Junlong Xie Xuejun Wang Guanghui Wu Keqi Wu 

机构地区：[1]Huazhong Univ Sci & Technol, Sch Energy & Power Engn, Wuhan 430074, Hubei Province, Peoples R China

出　　处：《Journal of Thermal Science》2004年第4期321-327,共7页热科学学报（英文版）

摘　　要：The Digital Particle Image Velocimetry (DPIV) is an efficient method for measuring the internal flow field of a low-speed cooling fan. This paper studied the velocity field by means of PIV technology for a leading edge swept axial-flow fan without casing, and the tip vortex phenomenon was observed. Time-averaged velocity measurements were taken near the pressure surface, the suction surface and the tip of blade, etc. Moreover, the flow characteristics were visualized using numerical techniques. Experimental results showed that this tip vortex existed at the leading edge of the blade. The generating, developing and dissipating evolvement process of the tip vortex from the blade leading edge to downstream were discussed in detail. In addition, by comparing DPIV results and numerical results, a good agreement between them indicated a possibility to predict flow field using CFD tools. The experimental data provided in this paper are reliable for improving the aerodynamic characteristics of the open axial fan.The Digital Particle Image Velocimetry (DPIV) is an efficient method for measuring the internal flow field of a low-speed cooling fan. This paper studied the velocity field by means of PIV technology for a leading edge swept axial-flow fan without casing, and the tip vortex phenomenon was observed. Time-averaged velocity measurements were taken near the pressure surface, the suction surface and the tip of blade, etc. Moreover, the flow characteristics were visualized using numerical techniques. Experimental results showed that this tip vortex existed at the leading edge of the blade. The generating, developing and dissipating evolvement process of the tip vortex from the blade leading edge to downstream were discussed in detail. In addition, by comparing DPIV results and numerical results, a good agreement between them indicated a possibility to predict flow field using CFD tools. The experimental data provided in this paper are reliable for improving the aerodynamic characteristics of the open axial fan. Keywords flow visualization - open axial-flow fan - digital particle image velocimetry - tip vortex CLC number O357.1

关 键 词：flow VISUALIZATION open AXIAL-FLOW FAN DIGITAL particle image VELOCIMETRY TIP vortex. 

分 类 号：TB126[理学—工程力学]