指數(shù)律參數(shù)選取對指數(shù)和廓線精度的影響
發(fā)布時間：2018-10-13 12:19
【摘要】：基于廣州市主城區(qū)水平比例尺為1∶7 000和垂直比例尺分別為1∶500、1∶1 000、1∶2 000的三維建筑模型,在B類邊界層中性流條件下進行風(fēng)洞模擬.利用26個測點、15個高度的西北和東南盛行風(fēng)況下的風(fēng)速數(shù)據(jù),分析指數(shù)律參考高度zref、零平面位移d和采樣厚度t等3個參數(shù)對指數(shù)α和擬合精度的不確定性影響,并為指數(shù)律應(yīng)用中精度的提高提供了相應(yīng)的建議.實驗結(jié)果表明:參考測點最高高度α的均值和離散度相對較小,且擬合較為理想;d的引入能提高擬合精度,且與α呈負(fù)相關(guān);不考慮零平面位移d的指數(shù)律對下墊面非均質(zhì)、測點眾多的研究更為實際;不同粗糙程度的下墊面,α在0.25~1 H廓線厚度段內(nèi)收斂,0.25~1 H是理想的采樣厚度.
[Abstract]:Based on a 3D building model with a horizontal scale of 1:7 and a vertical scale of 1: 500: 1 000 to 1: 2 000 in the main urban area of Guangzhou, wind tunnel simulation is carried out under the condition of neutral flow in class B boundary layer. Using the wind speed data of 26 measuring points and 15 heights in the prevailing wind conditions in northwest and southeast of China, the uncertain effects of three parameters, such as zref, zero plane displacement d and sampling thickness t, on the index 偽 and fitting accuracy are analyzed. Some suggestions are provided for the improvement of precision in the application of exponential law. The experimental results show that the mean value and dispersion of the maximum height of the reference point 偽 are relatively small and the fitting is ideal, the introduction of d can improve the fitting accuracy and is negatively correlated with 偽, and the exponential law of zero plane displacement d is not considered for the heterogeneity of the underlying surface. The study of many measuring points is more practical, and for the underlying surface with different roughness, 偽 converges in the thickness of 0.25 ~ 1H profile, and 0.25 ~ (-1) H is the ideal sampling thickness.
【作者單位】： 華南師范大學(xué)地理科學(xué)學(xué)院;廣東省建筑科學(xué)研究院集團股份有限公司風(fēng)工程研究中心;
【基金】：國家自然科學(xué)基金項目(41771001) 廣州市科技計劃項目(201704020136)
【分類號】：P425.6;TU14
本文編號：2268602
[Abstract]:Based on a 3D building model with a horizontal scale of 1:7 and a vertical scale of 1: 500: 1 000 to 1: 2 000 in the main urban area of Guangzhou, wind tunnel simulation is carried out under the condition of neutral flow in class B boundary layer. Using the wind speed data of 26 measuring points and 15 heights in the prevailing wind conditions in northwest and southeast of China, the uncertain effects of three parameters, such as zref, zero plane displacement d and sampling thickness t, on the index 偽 and fitting accuracy are analyzed. Some suggestions are provided for the improvement of precision in the application of exponential law. The experimental results show that the mean value and dispersion of the maximum height of the reference point 偽 are relatively small and the fitting is ideal, the introduction of d can improve the fitting accuracy and is negatively correlated with 偽, and the exponential law of zero plane displacement d is not considered for the heterogeneity of the underlying surface. The study of many measuring points is more practical, and for the underlying surface with different roughness, 偽 converges in the thickness of 0.25 ~ 1H profile, and 0.25 ~ (-1) H is the ideal sampling thickness.
【作者單位】： 華南師范大學(xué)地理科學(xué)學(xué)院;廣東省建筑科學(xué)研究院集團股份有限公司風(fēng)工程研究中心;
【基金】：國家自然科學(xué)基金項目(41771001) 廣州市科技計劃項目(201704020136)
【分類號】：P425.6;TU14
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