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为进一步研究筒装料管道水力输送技术并完善动边界同心环状缝隙流理论,探讨了管道车在平直管段中不同雷诺数稳定运行时所产生的缝隙流水力特性。在动边界条件下,缝隙流的平均流速和管道车速度随输送雷诺数的增大而增大;在缝隙流内部,最大流速出现在距离动边界2mm处;在距离动边界14.5mm附近出现增压减速的现象;对同一位置,动水压强与雷诺数成幂函数关系。根据缝隙流随雷诺数的变化特性,从运行速度与能耗比的角度提出了最佳输送雷诺数的概念和确定最佳输送雷诺数两种方法,对筒装料管道水力输送技术在实际工程中的应用提出了合理化建议。
In order to further study the hydraulic conveying technology of tube charge pipelines and improve the concentric annular gap flow theory at the dynamic boundary, the hydraulic characteristics of the slot flow generated by the steady Reynolds number of straight-line pipelines are discussed. Under the dynamic boundary condition, the average flow velocity of the slit flow and the speed of the pipeline increased with the increase of the Reynolds number. The maximum flow velocity appeared within 2 mm from the moving boundary within the slit flow and increased around 14.5 mm from the moving boundary Pressure deceleration phenomenon; the same location, hydrodynamic pressure and Reynolds number power function. According to the changing characteristics of the slit flow with the Reynolds number, the concept of the optimal conveying Reynolds number and the method of determining the optimal conveying Reynolds number are put forward from the perspectives of the running speed and the energy consumption ratio. In the practical engineering In the application of reasonable suggestions put forward.