【摘要】 明渠高含沙水流紊动特性的研究比较多,而关于高含沙管流紊动的文献则很少见到。我们在管路试验系统中,用应变式紊动流速仪,观测了管道内高含沙水流紊动强度的大小、沿垂线分布以及流速、含沙量对紊动强度大小和分布的影响,初步探讨了流核区内存在紊动、管轴处紊动强度不小于其周围附近点紊动强度值的机理。更多还原

【Abstract】 In an experimental circulating pipe system, using strain turbulent velocity meter, the magnitude and vertical distribution of velocity and turbulence intensity (σ) of high sediment-laden flow were measured. Based on the experimental data, the distribution laws of a in pipe flow are compared with that in open channel flow. The mechanism of the existence of turbulence in flow-core, where du/dy = 0, and the fact that a at the midpoint of the profile (where also du/dy = 0) is larger than that at surrounding points are discussed. The influence of mean velocity and sediment concentration on the magnitude and distribution of a are analysed.更多还原