24 August 2009 Research on vortices characteristic of flow past obstacles by PIV system
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Proceedings Volume 7375, ICEM 2008: International Conference on Experimental Mechanics 2008; 73751U (2009) https://doi.org/10.1117/12.839074
Event: International Conference on Experimental Mechanics 2008 and Seventh Asian Conference on Experimental Mechanics, 2008, Nanjing, China
The experimental research of flow past obstacles is conducted by particle image velocimetry (PIV) system. A special apparatus has been designed and developed Three types of obstacles are used in the study are three types, which are quadrate cylinder, trapeziform cylinder and triangular cylinder. The obstacles are placed adjacent with a slope. The mean velocity distribution of the whole field is obtained under the Reynolds number of 3700. The streamlines of mean velocity field in the symmetry plane are given. The vortices characteristics of flow past various obstacles are described in detail. Visualization results indicate that the position and size of vortices in the wake are quite different. The vortex position of quadrate cylinder is lowest, triangular cylinder highest and trapeziform cylinder. All of them are lower than those when obstacles are placed on horizontal plane. From model A to model C, the size of vortices becomes larger. It can be explained that the shape of obstacles and the slope both have effect on the size and position of vortices. Based on experimental data, the mean streamwise and spanwise velocity components of each obstacle are plotted at specified streamwise stations. Finally the reattachment length of three models is calculated. The data obtained from this work are available for computational results to compare with in the future.
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Shan-qun Chen, Shan-qun Chen, Ze Wang, Ze Wang, } "Research on vortices characteristic of flow past obstacles by PIV system", Proc. SPIE 7375, ICEM 2008: International Conference on Experimental Mechanics 2008, 73751U (24 August 2009); doi: 10.1117/12.839074; https://doi.org/10.1117/12.839074

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