最大沙粒堆积率对风沙流结构的影响  

Efect of the maximum volume fraction of sand particles on windblown sand structure

作　　者：王晓庆[1] 武建军[1] 

机构地区：[1]兰州大学西部灾害与环境力学教育部重点实验室,土木工程与力学学院,兰州730000

出　　处：《兰州大学学报（自然科学版）》2013年第5期616-620,626,共6页Journal of Lanzhou University(Natural Sciences)

基　　金：国家重点基础研究发展规划项目(2009CB421304)

摘　　要：采用欧拉双流体模型,利用数值方法研究了最大沙粒堆积率对风沙流结构的影响.结果表明:随着最大沙粒堆积率的增大,沙粒速度和风速在跃移层内都有明显增大,而沙粒体积分数在近床面却有所减小,但离开床面一定高度后,沙粒体积分数几乎不受最大沙粒堆积率的影响.Based on the Eulerian-Eulerian two-fluid model and by simulating the development of the wind- blown sand bed, the effects of the maximum volume fraction of sand particles on windblown sand structure were discussed. The results show that, with the increase of the maximum volume fraction of sand particles, the wind velocity and the velocity of sand particles rise significantly in the saltation layer, while the volume fraction of sand decreases within certain height above the surface of sand bed, but once it goes higher than this height value, the influence of the maximum volume fraction of sand particles on the volume fraction of sand can nearly be ignored.

关 键 词：欧拉-欧拉模型 沙床 最大沙粒堆积率 风沙流结构 

分 类 号：O359[理学—流体力学] X169[理学—力学]