原文传递
Effects of Free-Stream Turbulence and Reynolds Number on the Aerodynamic Characteristics of a Semicylindrical Roof
| 题名： | Effects of Free-Stream Turbulence and Reynolds Number on the Aerodynamic Characteristics of a Semicylindrical Roof |
| 其他题名： | Basu,R.I.(1986)."Aerodynamic forces on structures of circular crosssection.Part 2.The influence of turbulence and three-dimensional effects."J.Wind Eng.Ind.Aerodyn.,24(1),33–59. |
| 正文语种： | 英文 |
| 作者： | Ying Sun |
| 关键词： | Cylindrical roof;Power spectra;Reynolds number;Turbulence intensity;Wind pressure and force;Wind effects |
| 摘要： | The influences of free-stream turbulence and Reynolds number on the aerodynamic characteristics of a semicylindrical roof have been investigated experimentally under uniform flow conditions. Grids were used to generate homogeneous turbulent flows with turbulence intensities varying from 5.7 to 12.2％. The diameters, D, of the semicylindrical roof models were 0.2 and 0.6 m. The Reynolds numbers based on D ranged from 6.90 × 104 to 8.28 × 105 in smooth flow and from approximately 6.06 × 104 to 4.79 × 105 in grid-generated turbulent flow. Measurements of the surface pressure indicated that, in smooth flow, the mean and RMS pressure distributions became Reynolds number independent when R > 4.14 × 105. The introduction of turbulence has caused a premature transition of the separated shear layer from laminar to turbulent. Increasing free-stream turbulence helps to remarkably reduce the mean and fluctuating drag force at lower Reynolds number, R < 1.46 × 105. There is also a relatively significant reduction in the mean lift force as the turbulence intensity increases when R > 1.46 × 105. The data also suggested that the effects of turbulence essentially depend on the turbulence intensity and the ratio of turbulence length scale to cylinder diameter. The small-scale turbulence was better able to interact with the surface boundary layer before and after separation and thus dramatically increased the pressure fluctuations in both the top and wake regions. |
| 出版年： | 2015 |
| 论文唯一标识： | P-26Y2015V141N09023 |
| 英文栏目名称： | Technical Papers |
| doi： | 10.1061/(ASCE)ST.1943-541X.0001209 |
| 期刊名称： | Journal of Structural Engineering |
| 拼音刊名(出版物代码)： | P-26 |
| 卷： | 141 |
| 期： | 09 |
| 页码： | 257-267 |
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