靶距对淹没射流冲刷沙床影响的数值模拟  

Numerical Simulation of Jet Distance Influence on Scouring on Sand Bed by Submerged Jet

作　　者：李雯[1] 倪福生[1] 王建军[1] 

机构地区：[1]疏浚技术教育部工程研究中心河海大学机电工程学院,常州213022

出　　处：《科学技术与工程》2014年第29期290-294,共5页Science Technology and Engineering

摘　　要：射流冲刷水下淤积物以及破碎板结土在疏浚工程中有着广泛的应用,对其进行研究很有必要。以中值粒径d50=1.8mm的沙床为研究对象,采用泥沙冲刷模型进行二维垂向淹没射流冲刷沙床的数值模拟研究,探究射流靶距h对淹没射流冲刷沙床的影响。数值模拟结果与实验结果吻合较好。结果表明:在冲刷前期,冲刷坑深度εm随h的增大而减小;在冲刷后期,εm随h的增大呈现先增大后减小的趋势。Water jet is widely used in dredging engineering,it can clear away the sediment and break the compact soil under water.Therefore,it is necessary to study the jet scour.The sand bed with the median particle size d50 =1.8 mm is selected as the research object.For obtaining the relationship between jet distance h and the scour,the Sediment Scour Model is used to simulate the erosion.The numerical simulation results are found in good agreement with those obtained from the experiment.They indicate in the early stage of the scour,the scour depth εm decreases with the h increasing.In the late stage of the scour,εm first increases and then decreases with increasing of h.

关 键 词：靶距 淹没射流 冲刷 数值模拟 

分 类 号：U442.32[建筑科学—桥梁与隧道工程]