Experimental study on the pressure distribution of a low aspect-ratio circular cylinder and interference effects of a square cylinder in downburst flows

Autor: Ting-rui Yue, Yu-jie Zeng, Jian-feng Yan, Han-jie Huang, Heng-ren Fu, Zhi-tao Yan
Rok vydání: 2021
Předmět:
Zdroj: Journal of the Brazilian Society of Mechanical Sciences and Engineering. 43
ISSN: 1806-3691
1678-5878
DOI: 10.1007/s40430-021-02943-4
Popis: Wind loads on a surface-mounted finite-height circular cylinder are strongly influenced by the flow field structure. Based on the stationary and moving downburst flows simulated by an impinging jet device, this paper studies the wind pressure distribution in a circular cylinder with a low aspect ratio of AR = 2 at different radial positions and discusses the interference effects of other cylinders. The results indicate that the Reynolds number has a significant effect on the mean wind pressure coefficient on the crosswind side. The maximum absolute value of the mean coefficients on the leeward and crosswind sides appears at r/Djet = 1.0. In general, the interference effect of the square cylinder closely spaced on the fluctuating coefficients of each side is the largest when it is in the upstream position in tandem. The pressure distribution on the crosswind side is more easily affected by the interference cylinder. Under the action of a moving downburst, the instantaneous pressure coefficients on all sides of the cylinder have both positive and negative peaks, and the maximum overshooting variation is close to three. The overshooting effect lasts in a shorter time and has a greater impact on the structure when the downburst moving speed is faster.
Databáze: OpenAIRE
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