本文選題：風(fēng)洞試驗(yàn)　切入點(diǎn)：紊流強(qiáng)度　出處：《建筑科學(xué)與工程學(xué)報(bào)》2017年06期

【摘要】：為了得到風(fēng)特性參數(shù)變化對(duì)結(jié)構(gòu)表面風(fēng)壓分布的影響規(guī)律,在風(fēng)洞中采用格柵紊流,分別形成了紊流強(qiáng)度相同但積分尺度不同與積分尺度相同但紊流強(qiáng)度不同的幾種局部紊流風(fēng)場(chǎng),以此來(lái)研究紊流風(fēng)特性參數(shù)對(duì)矩形結(jié)構(gòu)表面風(fēng)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(jié)果表明:紊流強(qiáng)度增大會(huì)使矩形結(jié)構(gòu)表面正壓區(qū)體型系數(shù)增大,負(fù)壓區(qū)體型系數(shù)絕對(duì)值減小;正壓區(qū)風(fēng)壓變化規(guī)律與結(jié)構(gòu)尺度無(wú)關(guān),負(fù)壓區(qū)體型系數(shù)除了受來(lái)流紊流強(qiáng)度影響外,還存在明顯的尺度效應(yīng);紊流積分尺度增大會(huì)使矩形結(jié)構(gòu)表面體型系數(shù)絕對(duì)值也增大,但不同區(qū)域變化幅度沒(méi)有規(guī)律,很難進(jìn)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(zhǎng)安大學(xué)公路學(xué)院;長(zhǎng)安大學(xué)公路大型結(jié)構(gòu)安全教育部工程中心;
【基金】：中國(guó)博士后科學(xué)基金項(xiàng)目(2014M560737,2016T90876)
【分類號(hào)】：TU312.1

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