Wind tunnel test on windproof benefit of horniness HDPE sand barrier
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摘要:目的研究硬质地HDPE网沙障防风效能。方法按照1:10的比例制作不同高度(1、2和3 cm)、不同边长(10、15和20 cm)、不同孔隙度(0.5和0.6)的硬质地HDPE网沙障模型,通过布设测点模拟出不同配置模式下沙障网格纵截面流场图及风速稳定后沙障网格内水平流场图,并运用地统计学的方法进行空间自相关分析。结果空间自相关分析中18种不同配置模式的沙障有16种符合高斯模型,2种符合球状模型,且所有模型R2均高于0.97,空间相关度小于25%,变程大于测点间距,表明不同沙障网格都具有强烈的空间自相关性,且测点间距合理。气流在通过沙障时可顺畅的从沙障孔隙中穿过,不会造成气流的抬升加速作用,因此障后近地表及沙障上方的风速均低于相同高度处的对照风速。硬质地HDPE沙障防风效能在本研究设置的变量梯度范围内与高度呈正相关关系,与边长和孔隙度呈负相关关系,高度和孔隙度对防风效能的影响较大。结论硬质地HDPE材料性质稳定,不会产生塑性变形,抗老化能力强,且防风效果较好,应用前景较好。Abstract:ObjectiveThe objective of this study was to research the benefit of horniness HDPE sand barrier on windproof.MethodWe have made horniness HDPE sand barrier model of different heights (1, 2 and 3 cm), lengths (10, 15 and 20 cm), and porosity (0.5 and 0.6) according to the 1:10 ratio. We simulated the vertical flow field map and the horizontal flow field map of stable wind speed grid under different configuration modes by laying out the measuring points, and used the geostatistical method to carry out spatial autocorrelation analysis.ResultIn the spatial autocorrelation analysis, there were 16 kinds of sand barriers in 18 different configuration patterns conforming to the Gauss model, 2 conformed to the spherical model, and the R2 of all the models was higher than 0.97, the spatial correlation was less than 25%, and the change range was larger than the distance between the measuring points. It showed that the different sand barriers all had strong spatial autocorrelation, and the distance between measuring points was reasonable. The airflow can smoothly cross the pores when passing through the sand barrier, which will not cause the lifting and acceleration of the air flow. Therefore, the wind speed near the surface and above the barrier was lower than the control wind speed at the same height. The wind-proof performance of the horniness HDPE sand barrier was positively correlated with the height within the variable gradient range set in this study, and negatively correlated with the side length and porosity.ConclusionThe horniness HDPE material has stable properties, no plastic deformation, strong anti-aging ability, good windproof effect and good application prospects.
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图 6 不同沙障风速频数累积曲线
10-1表示边长为10 cm,高度为1 cm的沙障;10-2表示边长为10 cm,高度为2 cm的沙障,以此类推。10-1 represents the sand barrier with 10 cm side length and 1 cm height, 10-2 represents the sand barrier with 10 cm side length and 2 cm height, and so on.
Figure 6. Frequency accumulation curves of wind speed for different sand barriers
表 1 不同布设模式沙障空间自相关分析
Table 1 Spatial autocorrelation analysis of sand barrier in different layout modes
孔隙度
Porosity边长
Side length/cm高度
Height/cm模型
Model块金值
Nugget (C0)基台值
Sill (C + C0)SCD/% 变程
Range (A)R2 RSS 0.5 10 1 高斯 Gaussian 0.000 01 0.015 8 0.06 14.9 0.998 0.38 × 10− 7 2 高斯 Gaussian 0.002 40 0.069 5 3.45 27.2 0.992 2.07 × 10− 7 3 高斯 Gaussian 0.000 01 0.028 7 0.03 17.0 0.986 1.96 × 10− 7 15 1 球状 Spheroidal 0.000 01 0.027 3 0.04 13.5 0.979 2.63 × 10− 7 2 高斯 Gaussian 0.000 45 0.054 8 0.82 16.9 0.982 3.65 × 10− 7 3 高斯 Gaussian 0.000 16 0.031 4 0.51 20.2 0.991 0.30 × 10− 7 20 1 高斯 Gaussian 0.000 02 0.024 7 0.08 21.5 0.972 2.83 × 10− 7 2 高斯 Gaussian 0.000 27 0.016 5 1.64 15.6 0.989 3.15 × 10− 7 3 高斯 Gaussian 0.000 13 0.035 2 0.37 19.2 0.968 2.37 × 10− 7 0.6 10 1 高斯 Gaussian 0.000 19 0.026 4 0.72 17.8 0.984 1.47 × 10− 7 2 高斯 Gaussian 0.000 32 0.017 9 1.79 20.1 0.978 2.35 × 10− 7 3 高斯 Gaussian 0.000 18 0.032 5 0.55 16.7 0.982 0.26 × 10− 7 15 1 高斯 Gaussian 0.000 24 0.031 8 0.75 18.3 0.993 1.78 × 10− 7 2 球状 Spheroidal 0.000 53 0.026 5 2.00 17.7 0.985 3.24 × 10− 7 3 高斯 Gaussian 0.000 37 0.014 7 2.52 18.2 0.975 1.64 × 10− 7 20 1 高斯 Gaussian 0.000 42 0.013 2 3.18 19.3 0.982 0.67 × 10− 7 2 高斯 Gaussian 0.000 21 0.035 7 0.59 15.7 0.994 2.12 × 10− 7 3 高斯 Gaussian 0.000 01 0.015 3 0.07 16.3 0.974 2.45 × 10− 7 注:SCD. 空间相关度。Note: SCD, spatial correlation degree. 表 2 不同沙障防风效能
Table 2 Windbreak efficiency of different sand barriers
孔隙度
Porosity边长
Side length/cm高度
Height/cm防风效能
Windbreak efficiency0.5 10 1 0.46 2 0.62 3 0.64 15 1 0.58 2 0.61 3 0.60 20 1 0.50 2 0.57 3 0.61 0.6 10 1 0.43 2 0.45 3 0.49 15 1 0.44 2 0.44 3 0.48 20 1 0.46 2 0.46 3 0.50 -
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