输沙管道高含沙水流阻力特性探讨

根据对实测资料的分析,得出了输沙管道高含沙水流沿程和局部阻力系数的变化规律及确定方法,提出了管道综合泥沙因子和综合阻力系数的相关关系,同时指出细颗粒组成对高含沙水流的阻力特性有很大影响。分析表明:随着含沙量的增大,悬沙级配的粒径分布范围变宽,细颗粒在悬沙中所占比重减小,当细颗粒增加到一定程度时,单位体积水流可以挟带大量的粗颗粒泥沙;在输送高含沙水流时,应确定其最优细颗粒含量,以降低水流阻力,提高输沙效率。

Approach to Characteristics of Resistance of Hyper-Sediment Concentrated Flow in Sediment Delivery Pipes

The paper obtains the variation laws of hyper-sediment concentrated flow in the sediment delivery pipe and local resistance coefficient and methods for confirmation, puts forward correlation of pipe comprehensive sediment factor and comprehensive resistance coefficient and; points out the influence of fine particle composition to the resistant characteristic of hyper-sediment concentrated flow based on the analysis of observed data. The analysis is shown that the distribution scope of particle size of suspended load gradation is getting wider along with the increase of sediment concentration, the specific density of fine particles in suspended load is getting smaller and the unit volume flow can carry large amount of coarse sand as fine particles increased to a certain level and; it should decide the optimized concentration of fine particles when delivering hyper-sediment concentrated flow for reducing flow resistance and increasing sediment delivery rate.