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Inner Mongolia Agricultural University (内蒙古农业大学) 2021

Wind Tunnel Simulation Experiment Study on the Mechanism of Wind-proof and Sand-fixing with

高天笑

Titre : Wind Tunnel Simulation Experiment Study on the Mechanism of Wind-proof and Sand-fixing with

Auteur : 高天笑

Grade : Master 2021

Université : Inner Mongolia Agricultural University (内蒙古农业大学)

Résumé partiel
The wing bag sand barrier is a combined sand barrier designed according to the bottom bag fixed quicksand and the wings on the bag fluctuate in the wind to weaken the wind speed.It has been granted a patent.The experiment was carried out in the wind tunnel of the Key Laboratory of Desert and Desertification of the Chinese Academy of Sciences,Zhongwei,Ningxia,with3 different bottom bag diameters(10cm,12cm,15cm)and 9 specifications(corresponding to the height of the wings 10cm,15cm,20cm)wing bag sand barriers.The wind velocity flow field,the structure of sand flow,the characteristics of sand transport and the situation of wind erosion wind accumulation are studied,and the results show that :(1)The wind speed between and behind the barrier of different specifications of wing bag sand barriers is significantly reduced and there are differences.When the wind speed is 5m·s-1,the wind-proof efficiency of the 9types of wing bag sand barriers is between 50.7%-82.5% ;when the wind speed is 8m·s-1,the wind-proof efficiency is 56.25%-76.75% ;the wind speed is12m·s-1At the same time,the windproof efficiency is 63.04%-78.17%.(2)The wing bag sand barrier can reduce the front,middle,and rear wind speeds.The larger the bottom bag diameter of the same wing height,the lower the wind speed at the front and middle position of the sand barrier ;the same wing height sand barrier with different bottom bag diameters will cause weaker wind speeds afterwards The zone distance range is the same,and the greater the height of the wings,the farther the distance in the weak wind speed zone.(3)The wing bag sand barriers of different specifications change the trajectory of the sand flow on the surface and effectively intercept the sand particles in the sand flow on the surface.Compared with the bag-shaped sand barrier,the wing bag sand barrier reduces the sand transport by an average of85.2%.When the wind speed is 5m·s-1,the wing bag sand barriers of different specifications can reduce the sand transport by 70.1%-98%compared with the no sand barrier ;when the wind speed is 8m·s-1the sand transport will be reduced by 14.2%-95% ;when the wind speed is 12m·s-1,the sediment transport will be reduced by 18%-80.1%

Mots clés : Wing bag sand barrier ;Windproof effect ;Sand-fixing effect ;Wind erosion and accumulation conditions ;Wind tunnel simulation experiment ;

Présentation (CNKI)

Page publiée le 5 mars 2022