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斜插板式沙障插板倾角影响下风沙流特征的数值模拟
丁泊淞, 高丽, 程建军, 陈柏羽
石河子大学 水利建筑工程学院, 新疆 石河子 832003
摘要:
[目的] 优化既有沙障的结构形式,以发挥最大挡沙功效,揭示铁路沿线斜插板式沙障的风沙流特征和规律,为风沙灾害防治提供相关的设计参考和科学依据。[方法] 基于欧拉双流体非定常模型对具有不同插板倾角(15°,30°,45°和60°)但孔隙率均为30%的斜插板式沙障进行数值模拟。[结果] ①随插板倾角逐渐增大,沙障迎风侧减速区范围无明显变化,上方加速区和背风侧涡流区范围逐渐增大,迎风侧气流向下弯曲运动的趋势逐渐增强,背风侧向上运动的气流与水平风向夹角逐渐增大。②不同风速下,4种斜插板式沙障周围风速均呈“U”型分布,对同一风速而言,背风侧涡流区内风速极小值与插板倾角呈负相关。[结论] 随插板倾角逐渐增大,沙障迎风侧积沙量逐渐增多,背风侧整体积沙量逐渐减少但背风侧1 H范围内积沙量逐渐增多,背风侧主要积沙分布范围与沙障之间的距离逐渐增大。
关键词:  斜插板式沙障  插板倾角  风沙流场  数值模拟
DOI:10.13961/j.cnki.stbctb.2021.01.019
分类号:U216.41+3
基金项目:新疆生产建设兵团中青年科技创新领军人才计划项目“风沙防治基础理论与工程技术方法”(2019CB023);新疆生产建设兵团重大科技计划项目“南疆陆地交通智慧建养成套技术与装备研究”(2020AA002)。
Numerical Simulation of Wind-Sand Flow Characteristics of Inclined Inserting-Type Sand Fence Under Influence of Inserting Plate Angle
Ding Bosong, Gao Li, Cheng Jianjun, Chen Boyu
College of Water Resources and Architectural Engineering, Shihezi University, Shihezi, Xinjiang 832003, China
Abstract:
[Objective] The structure form of existing sand barriers was optimized to maximize the sand retention effect, the characteristics of wind and sand flow of inclined inserting-type sand fences along a railway were studied in order to provide a relevant design reference and scientific basis for the prevention and control of wind and sand disasters.[Methods] Based on the Eulerian two-fluid unsteady model, numerical simulations were conducted on inclined inserting-type sand fences with different inclination angles of the insert plate (15°, 30°, 45°, and 60°) but the same porosity (30%).[Results] ① The inclination angle of the insert plate gradually increased, the range of the windward side deceleration zone did not change significantly, and the range of the upper acceleration zone and the leeward side vortex zone gradually increased. The tendency of the windward side airflow to bend downward gradually increased, and the angle between the airflow moving upward on the leeward side and the horizontal wind direction gradually increased. ② Under different wind speeds, the wind speeds around the inclined inserting-type sand fence were U-shaped curves. For the same wind speed, the minimum wind speed in the leeward vortex area was negatively correlated with the inclination angle of the plate.[Conclusion] As the inclination angle of the inserting plate increased gradually, the sand on the windward side gradually increased, and the sand on the leeward side gradually decreased. However, the sand in the 1 H range on the leeward side gradually increased. The distance between the main sand distribution on the leeward side and the sand barrier gradually increased.
Key words:  inclined inserting-type sand fence  angle of inserting plate  wind-sand flow fields  numerical simulation