摘要
运用颗粒流体二相流的随机行走扩散模型(DRW)研究了紊流风场下起跳沙粒的运动轨迹特性。得出了轨迹特性(长度、高度、撞击角)随沙粒的大小和风速的变化规律,发现随沙粒粒径的减小紊流脉动对轨迹的影响显著增大。粒径在200μm以下时,紊流风场下计算得的轨迹形状与平均风场下得到的轨迹有明显差异。
A discrete random walk dispersion model is applied to study the trajectory characteristics of jumped sand particles in turbulent air flow in this paper. The law of the height and the length of trajectory change with sand diameter and wind velocity are obtained. With the particle diameter increased, the height, length and impact angle of trajectory increased. It is discovered that turbulent oscillation has greater influence on the trajectory of sand particle with smaller diameter. For sand particles with diameter less than 200 μm the trajectory forms computed from oscillate velocity and average velocity have distinct difference. If particle diameter is smaller than 100 μm the particle suspension phenomenon may occur in wind.
出处
《中国沙漠》
CSCD
北大核心
2003年第6期628-631,共4页
Journal of Desert Research
基金
国家重点基础研究发展规划项目(G2000048702)
