本文通过测速风洞试验,得到了孔隙率、障条宽度对桥梁风障挡风性能的影响规律,并对桥梁风障的模拟方法及其挡风性能评价参数进行了研究。试验结果表明,风障有效挡风高度约为2.0H(H为风障高度),在1.0H范围内,风速降低较多,在1.0H高度处,流场湍流度达到最大。孔隙率对风障挡风性能影响较大,随着孔隙率的增大,风障下游风速增大,湍流度减小。障条宽度对风障挡风性能影响较小,相同孔隙率时,障条宽度对风障下游湍流度的影响可以忽略。按压力等效定义的风速折减系数较好反映了风速的变化规律,能够来用定量评价风障的挡风效果。
Abstract
Velocity measured wind tunnel tests have been carried out to investigate the windbreak performance of wind barriers on bridge considering different porosity and width of barrier, the simulation method of wind barrier in wind tunnel and evaluating parameter of windbreak performances are discussed in the paper. Tests results show that, the shielding region of wind barriers is about 2.0H (H is the height of wind barrier), and wind speed reduce a lot when the height below 1.0H. Turbulence intensity of flow on the downstream of wind barrier reaches the maximum at the height of 1.0H. Windbreak performance depends on porosity of wind barrier, wind speed will rise and turbulence intensity will decrease with porosity increasing. Width of barrier seems to have no relationship with its windbreak performance, when porosity is the same, the effect of width of barrier can be ignored. Wind speed reduction coefficient can be used to evaluate windbreak performance, which is defined by equivalence of pressure.
关键词
风障 /
挡风 /
桥梁 /
风洞试验 /
孔隙率 /
障条宽度
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Key words
wind barrier /
windbreak /
bridge /
wind tunnel test /
porosity /
width of barrier
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