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随着浆体管道输送工程的应用和发展,输送颗粒的粒径越来越大,伴有滑动床流动的粗颗粒浆体的输送工程越来越多。基于滑动床以上的悬浮层内的剪切应力呈线性分布的假设,提出了最大流速点(即剪应力最小点)位置的计算公式。在最大流速点至管道内任意点方向应用流速亏损定律,给出了悬浮层内任意点速度分布的计算模型。通过石膏矿石浆体管道输送试验,给出了若干组浓度分布、速度分布实验数据。通过若干组数据的回归分析,给出了最大速度值的计算公式及卡门常数值。利用试验数据,对最大速度点位置计算公式和滑动床上速度分布的计算模型进行了检验,其计算值和实测值的最大偏差分别为3.8%和14.3%。
With the application and development of the slurry pipeline project, the particle size of the conveying particles is getting larger and larger, and more and more coarse particle slurry flows with the sliding bed flow. Based on the assumption that the shear stress in the suspended layer above the sliding bed is linearly distributed, a formula for calculating the position of the maximum velocity point (ie, the minimum point of the shear stress) is proposed. Applying the law of velocity loss at the maximum flow velocity point to any point in the pipeline, a calculation model of the velocity distribution at any point in the suspended layer is given. Through the pipeline transportation experiment of gypsum ore slurry, some experimental data of concentration distribution and velocity distribution are given. Through the regression analysis of several groups of data, the formula of the maximum speed value and the Carmen constant value are given. Using the experimental data, the calculation formula of the maximum velocity point position and the calculation model of the velocity distribution on the sliding bed were tested. The maximum deviation between calculated and measured values was 3.8% and 14.3% respectively.