管道输沙未出现淤积前的阻力研究

ON THE RESISTANCE OF A FLOW IN CLOSED CONDUIT UNDER OCCURRENCE OF BOTH SUSPENDED LOAD AND BED LOAD

根据紊动悬浮泥沙的机理,本文分析了泥沙在管路中输送时有效悬浮指标的表达式。针对悬浮的泥沙与推移的泥沙耗能不同的特点,提出了在管路中泥沙全部悬浮和泥沙既有悬移又有推移,但尚未出现淤泥时的阻力计算公式。应用前人及本文作者的实验资料检验的结果表明,用本文公式计算的结果与实测值吻合较好。

Suspension index of the flow in a closed conduit is analysed analysed considering the me- chanism of the turbulent sediment sUSpension.A formula is suggesled for calculating the flow resistance under the occurrence of both suspended load and bed load.In this formula the different characteristies of energy dissipation caused by suspended load and bed load is considered.The formula is checked by experimental data collecled by the authors and other researchers.The calculated values are in good agreement with t...