Investigation of mean and fluctuation characteristics of the wake flow behind cylinders fitted with textile materials
D. S. Mironov1, V. A. Lebiga1,2, J. J. Miau3, V. N. Zinovvyev1, A. Yu. Pak1, M.-Ch. Tsai3, Y.-H. Lai3
1Khristianovich Institute of Theoretical and Applied Mechanics SB RAS, Novosibirsk, Russia
2Novosibirsk State University, Novosibirsk, Russia
3National Cheng Kung University, Tainan, Taiwan
Keywords: subsonic flow, two-dimensional flow around a cylinder, three-dimensional flow around a cylinder, textile materials, velocity fluctuations
Abstract
In the present paper, the results of a study of the influence of textile materials on the structure of the aerodynamic wake behind blunt-body models in the form of quasi-two-dimensional and cantilever cylinders are reported. The fabrics used were previously examined in the works by co-authors while determining the drag coefficient of a two-dimensional cylinder. The change in diameter in the latter case proved to be not more than 1%, and it was considered insignificant. The use of fabrics has made it possible to reduce the critical Reynolds number to about 2·105. The two- and three-dimensional flows turned out to be similar in terms of fluctuation level, whereas some narrowing of the wake behind the cantilever cylinder occurred due to the three-dimensional structure of the flow. Based on the results of spectral analysis, complete similarity between three- and two-dimensional flows was demonstrated, both for the flow around a smooth cylinder and for the flows around cylinders fitted with textile materials.
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