Numerical Simulation Of Wind-sand Two-phase Flow In Double-layer Windshield Anti-sand Wall

The “Belt and Road Initiative” has been adopted as an important policy and strategy for China to realize the great rejuvenation of the Chinese nation in internal affairs and foreign affairs.Among them,severe wind and sand disasters in the five northwestern provinces of the Silk Road Economic Belt have greatly hindered the development of China's economic globalization.The prevention and control of wind and sand will always be an important content related to the happiness of our people and the realization of the great rejuvenation of the Chinese nation.Wind-sand two-phase flow is a multi-phase flow of air and sand particles.Wind is the key factor for sand particles to start.This paper uses Euler-Euler two-fluid model in the FLUENT software to simulate and analyze the flow field characteristics and sand distribution around the windshield anti-sand wall in different parameters(that is,different porosity,different pore row Layout,different opening angles),with a view to providing a theoretical basis for the prevention and control of wind and sand in the “Belt and Road Construction”.The main research results of this article are as follows(based on the case of a windshield anti-sand wall with a height of 2m and a width of 0.3m):(1)The protective distance and recovery distance of the 0.4 pore windshield anti-sand wall is the largest,and the pressure difference between the front and rear is small,which has the best wind and sand prevention effect,and reduces wind erosion and damage to the wall,saving material costs.(2)On the basis of the above conclusion,when the pores are sparse-up and dense-down arranged,the windshield anti-sand wall has the best effect of wind and sand protection.Among them,the wind speed behind the wall which 1m away from the ground is the smallest.And most of the sand particles are stacked on the windward side of the wall,effectively achieving the sand blocking function.(3)On the basis of the first two conclusions,when the opening angle of the wall is 135 degrees,the wind speed behind the wall can be effectively reduced,and the distribution of sand deposits on both sides of the wall can be better coordinated.(4)On the basis of the parameters of the single-layer windshield anti-sand wall,when the distance between the double-layer walls is 45 m,it has a good shielding effect for different incoming wind speeds,and can effectively protect the wind and sand.Can prevent at least 83.33% of the sand particles from entering the rear area.Therefore,the conclusion of this paper is: In the case of a windshield anti-sand wall with a height of 2m and a width of 0.3m,we choose the double-layered wall with a porosity of 0.4,an arrangement of sparse-up and dense-down,an opening angle of 135 degrees,and a distance of 45 m between the two walls.The windshield anti-sand wall has a better wind and sand blocking effect for later sand protection projects.