本文選題：風洞試驗　切入點：紊流強度　出處：《建筑科學與工程學報》2017年06期

【摘要】：為了得到風特性參數(shù)變化對結構表面風壓分布的影響規(guī)律,在風洞中采用格柵紊流,分別形成了紊流強度相同但積分尺度不同與積分尺度相同但紊流強度不同的幾種局部紊流風場,以此來研究紊流風特性參數(shù)對矩形結構表面風壓分布規(guī)律的影響,并給出了考慮這些影響的修正公式。結果表明:紊流強度增大會使矩形結構表面正壓區(qū)體型系數(shù)增大,負壓區(qū)體型系數(shù)絕對值減小;正壓區(qū)風壓變化規(guī)律與結構尺度無關,負壓區(qū)體型系數(shù)除了受來流紊流強度影響外,還存在明顯的尺度效應;紊流積分尺度增大會使矩形結構表面體型系數(shù)絕對值也增大,但不同區(qū)域變化幅度沒有規(guī)律,很難進行統(tǒng)一修正。
[Abstract]:In order to obtain the influence of wind characteristic parameters on the distribution of wind pressure on the surface of the structure, the grid turbulence is used in the wind tunnel.Several local turbulent wind fields with the same turbulence intensity but different integral scale and different turbulence intensity are formed respectively. The influence of turbulent wind characteristic parameters on the distribution of wind pressure on the surface of rectangular structures is studied.A modified formula considering these effects is also given.The results show that the increase of turbulence intensity will increase the shape coefficient of the barotropic region and decrease the absolute value of the shape coefficient in the negative pressure region, and the variation of wind pressure in the barotropic region is independent of the structure scale.The shape coefficient in negative pressure region is affected by the intensity of turbulent flow, but there is also obvious scale effect, and the absolute value of surface shape coefficient of rectangular structure increases with the increase of turbulence integral scale, but there is no rule of variation in different regions.It is difficult to make a uniform correction.
【作者單位】： 長安大學公路學院;長安大學公路大型結構安全教育部工程中心;
【基金】：中國博士后科學基金項目(2014M560737,2016T90876)
【分類號】：TU312.1

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