论文部分内容阅读
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。
It has been found that the plow sediment will bypass the cylinder with the flow of water and form a sand-free zone on the bed surface around the cylinder. Based on the law of kinetic energy, a quantitative relationship between the unsmoothed area around the cylinder and the flow around the cylinder is established. Analysis of the quantitative relationship shows that the range of non-sandy area increases with the increase of the diameter of the cylinder. When the particle size of sediment decreases, the range of non-sandy area will increase. The change of water flow conditions directly affects the movement of sediment particles The situation is closely related to the formation and disappearance of non-sandy areas and the size of the area. The theoretical analysis results are consistent with the experimental phenomenon.