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针对传统近地层风沙流的理论与数值模拟研究以及风洞实验大多是基于理想条件(平坦床面、定常风速),而实际风沙运动通常发生在复杂环境下(如复杂地形、湍流结构风场等),沙漠最基本的地貌形态如沙丘、沙波纹等迎风面坡度对颗粒起动和输沙率影响很大。基于此,应用相位多普勒粒子分析仪(PDPA)对坡面近地表风场进行测量,得到迎风坡及背风坡的风场特性,并且采用SIMPLE算法对坡面风场进行了数值模拟。通过对数值模拟及风洞实验结果进行对比分析后,发现数值模型不仅能够有效地模拟风洞实验中坡面地表的风场特性,而且能够较为直观全面的展现迎风坡面、特别是背风坡面的风场结构特性。
Theoretical and numerical simulations of wind-blown sand flow in the near-surface layer and wind tunnel experiments are mostly based on ideal conditions (flat bed, constant wind speed), whereas actual wind-blown sand movement usually occurs in complex environments (eg complex terrain, turbulence wind field, etc.) ), The most basic topography of the desert, such as sand dunes and sand ripples, has a great influence on particle starting and sediment transport. Based on this, PDAP is used to measure the wind field near the surface of the slope, and the wind field characteristics of the windward and leeward slopes are obtained. The SIMPLE algorithm is used to simulate the wind field on the slope. After comparing the results of numerical simulation and wind tunnel experiment, it is found that the numerical model can not only effectively simulate the wind field characteristics of slope surface in wind tunnel experiment, but also show the windward slope surface more directly and comprehensively, especially the leeward slope surface Wind farm structural characteristics.