为便于研究紊流风特性参数对不同结构风洞试验结果的影响,本文采用风洞试验方法,通过对不同形式的格栅形成的局部紊流风场参数进行测试,总结格栅条间距、格栅条宽度对风洞不同断面紊流强度、紊流积分尺度及脉动风功率谱的影响规律。研究结果表明:距离格栅3.5m处的横截面即可形成均匀性较好的局部紊流风场。格栅产生的紊流强度随风速变化不大。格栅越窄,紊流强度越低,数据的稳定性越好。紊流积分尺度与格栅间距大致相当。给出了依据格栅间距与格栅宽度估算紊流强度与紊流积分尺度的公式,便于局部紊流风场调试。
Abstract
For the convenience of the study on the effects of turbulence characteristic parameters on the wind tunnel test results of different structures. The parameters of partial turbulent wind produced by different grille shapes were measured and the influence rules of the distance between the two grilles and the width of the grille on turbulence intensity, turbulence integral scale and fluctuating wind power spectra at different cross section were summarized by means of wind tunnel test. The research results show that the partial turbulent wind with good uniformity can be developed at the cross section 3.5 meters away from grilles. The turbulence intensity generates by grilles changes little with the change of wind velocity. Smaller widths of grilles, lower turbulence intensity, and better the stability of data. The size of turbulence integral scale is nearly the same as the distance between the two grilles. To facilitate the partial turbulent wind adjustments, the estimate formula of turbulence intensity and turbulence integral scale by the width and space of grilles has been obtained.
关键词
桥梁工程
/
风洞试验 /
格栅 /
紊流 /
风特性参数
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Key words
bridge engineering /
wind tunnel test /
grille /
turbulence /
wind characteristic parameters
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