低含沙水流圆柱和方柱绕流水动力特性  

Hydrodynamic Characteristics of Circular Cylinder and Square Cylinder in Sediment- laden Flow

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作  者:孙壮[1] 龚希武[1] 高杰[1] 

机构地区:[1]浙江海洋学院船舶与海洋工程学院,浙江舟山316022

出  处:《节能技术》2015年第6期489-494,共6页Energy Conservation Technology

基  金:国家自然科学基金(No.51179174);浙江省自然科学基金((No.Y5100180)

摘  要:为了研究低含沙水流中钝体绕流的水动力特性,基于FLUENT软件的DPM模型对亚临界雷诺数下二维钝体绕流进行数值模拟仿真。本文首先由清水实验得到平均阻力系数倒,在清水的基础上加入DPM模型,探究低浓度悬浮颗粒对Cd的影响。研究表明,加入低含量直径0.1mm的泥沙颗粒后,圆柱和方柱的cd有显著增长趋势。而方柱仍对舍沙量更敏感,单位体积含沙量的Cd增长率大于圆柱。圆柱在1%-4%含沙量水流中单位含沙量Cd增长率为0.45%-1.62%,增长平缓,含沙量增至4%~8%Cd增长率提升至1.29%~3.14%,增长相对剧烈;相应地,方柱的Cd增长率则由2.85%-4.31%提升至3.28%-4.56%,说明低含沙水流中圆柱和方柱Cd的增长规律与含沙量并非线性关系。In order to investigate hydrodynamic characteristics of bluff body flow in sediment - laden flow, flow past a bluff body is simulated by two dimensional numerical simulation at a range of subcritical Reyn- olds numbers adopting DPM model of FLUENT software. Firstly, average drag coefficient Cd is obtained from the clear - water experimental. Then effect of low concentration suspended particles on Cd is re- searched via DPM model on this basis. This work demonstrates that after adding low concentration sedi- ments whose diameter is 0.1 mm into clear - water, Cd of both square cylinder and circular cylinder have significant growth trend. Square cylinder is more sensitive to sediment concentration, and its Cd growth rate per unit volume fraction sediment is greater than circular cylinder. Cd growth rate of circular cylinder has a relatively small increase from 0.45% to 1.62% in sediment - laden flow when sediment volume fraction is from 1% to 4%. While Cd growth rate of circular cylinder has a relatively greater increase from 1.29% to 3.14% when sediment volume fraction is from 4% to 8%. Accordingly,Cd growth rate of square cylinder increases respectively from 2.85% to 4.31 and from 3.28% to 4.56%. Results indicate that Cd growth law of square and circular cylinder have a nonlinear relationship with sediment concentra- tion.

关 键 词:低含沙水流 亚临界雷诺数 阻力系数 DPM模型 

分 类 号:TV143[水利工程—水力学及河流动力学]

 

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