戈壁铁路挡风墙背风侧涡流长度及积沙的研究  

The Length of the Vortex and Aeolian Sand of Wind Break Walls in the Gobi Along Railways

作　　者：庞巧东[1] 刘建军[1] 程建军[1] 蒋富强[1] 

机构地区：[1]石河子大学水利建筑工程学院,石河子832003

出　　处：《石河子大学学报（自然科学版）》2011年第5期629-632,共4页Journal of Shihezi University(Natural Science)

基　　金：国家自然科学基金项目(50908152)

摘　　要：戈壁地区铁路沿线挡风墙的修建减小了大风对列车的危害,但由于气流在挡风墙背风侧形成了涡流区,反而造成了严重的积沙问题。本文利用流体数值分析的方法,对戈壁铁路沿线挡风墙背风侧的流场和积沙情况进行了模拟计算,分析了影响涡流长度主要因素和积沙状况,结果显示:涡流区长度随挡风墙高度和风速的增加而增加,随挡风墙宽高比和地表粗糙度增大而减小;主要积沙分布在墙角积沙区和涡流尾部积沙区。以上研究为铁路的安全运行与防风挡沙设计提供参考。The construction of wind break walls in the gobi along railway reduced the harm for train,but the air current formed a vortex behind the wind break wall,which made a serious aeolian sands.Based on the method of fluid numerical analysis,the flow field and the aeolian sand were simulated.The factors that affect the length of the vortex and the aeolian sand were analysed,and the result obtained is that the length of the vortex increases with the growing of the highness of wind break wall and wind speed,decrease with the growing of the aspect ratio of the wind break wall and the roughness constant of the earth＇s surface.The mian aeolian sand distribute at the behind of the wind break wall and the end of the vortex.What the study above will provide reference for the safe operation of railway and the design of wind and sand prevention.

关 键 词：戈壁铁路 挡风墙 涡流 积沙 数值模拟 

分 类 号：S511.01[农业科学—作物学] Q789[生物学—分子生物学]