圆柱绕流无沙区试验研究

Experiment Study of the Region Non-Sediment Movement in Cylinder Circulation Flow

摘要: 试验发现推移质泥沙随水流绕过圆柱体时,将在圆柱周围的床面上形成一个无沙区。根据动能定律建立了圆柱绕流无沙区的定量关系式。分析该定量关系式可知,无沙区的范围随圆柱直径的增大而增大;当泥沙粒径减小时,无沙区的范围将增大;水流条件的变化直接影响泥沙颗粒的运动情况,同无沙区的形成、消失及范围大小有密切的关系。理论分析结果同试验现象是一致的。

Abstract: This paper presents the experiment phenomena of particle at bottom in cylinder circulation flow.When the bed load round the cylinder with water flow,a region of non-sediment's moving will be formed in the bed layer near the cylinder.Based on the law of kinetic energy,the formula in the region of non-sediment movement is set up.The influence of the particle size,the diameter of cylinder and the Froude coefficient to the region there are no particle's movement are analysed.The analysis result from the formula agreeds with the experiment phenomena.