原文传递
Surface Roughness and Reynolds Number Effects on the Aerodynamic Forces and Pressures Acting on a Semicylindrical Roof in Smooth Flow
| 题名： | Surface Roughness and Reynolds Number Effects on the Aerodynamic Forces and Pressures Acting on a Semicylindrical Roof in Smooth Flow |
| 其他题名： | Apelt,C.J.,and G.S.West.1975."The effects of wake splitter plates on bluff-body flow in the range 1044.Part 2."J.Fluid Mech.71(1):145-160.https://doi.org/10.1017/S0022112075002479. |
| 正文语种： | 英文 |
| 作者： | Ye Qiu |
| 关键词： | Surface roughness;Reynolds number;Cylindrical roof;Wind effects;Power spectra |
| 摘要： | The effects of surface roughness and Reynolds number on the characteristics of aerodynamic forces and pressures on a semicylindrical roof have been investigated in a wind tunnel. Simultaneous pressure measurements on smooth and rough roofs were obtained under the smooth flow condition. The Reynolds number, based on the cylinder diameter D, was varied from 6.90 × 104 to 8.28 × 105 for the smooth roof and from 6.90 × 104 to 3.31 × 105 for rough roofs. The surface of the rough roof had a mean relative roughness of k=D = 3.0 × 10~(-4) to 7.5 × 10~(-4) (k is the roughness height). The results indicated that, for a smooth roof, the transition of the separated shear layer occurs in-between R = 6.90 × 104 ~4.14 × 105; for rough roofs, the transitional regime is observed at lower Reynolds numbers (in the case of k=D = 7.5 × 10~(-4), R < 1.24 × 105). In addition, the mean lift coefficient and the root-mean-square (R.M.S.) pressure coefficient of the rough roofs are considerably lower than those of a smooth roof. It was also found that the surface roughness has a significant influence on the flow around the cylindrical roof. The results of power spectra confirmed that the rough roof presents good organization of vortex shedding; however, no prevailing shedding frequency could be detected for the smooth roof at R beyond 9.66 × 104. |
| 出版年： | 2018 |
| 论文唯一标识： | P-26Y2018V144N09013 |
| 英文栏目名称： | TECHNICAL PAPERS |
| doi： | 10.1061/(ASCE)ST.1943-541X.0002129 |
| 期刊名称： | Journal of Structural Engineering |
| 拼音刊名(出版物代码)： | P-26 |
| 卷： | 144 |
| 期： | 09 |
| 页码： | 157-170 |
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