中文摘要：

为完善同心环状缝隙流理论,采用理论分析与模型试验相结合的方法,分析了圆柱体从静止到起动再到运行过程中同心环状缝隙流速的分布特点。得出圆柱体的速度、缝隙宽度以及流量对环状缝隙流的分布和大小的影响。环状缝隙流速随缝隙宽度的增大呈现先增大后减小的趋势,缝隙宽度约在2 cm附近时,缝隙流速最大;流量越大,环状缝隙流速就越大;圆柱体的速度越大,缝隙流速也越大;环状缝隙流速在与管内水流速度和圆柱体速度相交之前最大,相交之后最小。同时建立了动边界条件下的同心环状缝隙流数学模型,计算结果与试验基本一致,最大相对误差不超过8.5%,说明该数学模型可行。

英文摘要：

In order to perfect the theory on the cyclical slit flow of concentricity, the distribution features of the cyclical slit flow were analyzed from stopping to starting and to run procedure on the cylinder by a combination of theoretical analysis and model experiments. It is concluded that the speeds of the cylinders, the gap widths and the discharges have effect on the distribution and magnitude of the cyclical slit flow. The cyclical slit flow velocity increased firstly and then decreased as the gap width enlarged. When the gap width was about 2 cm, the cyclical slit flow velocity reached a maximum. The larger the discharge was, the larger the cyclical slit flow velocity would be. The larger the speed of the cylinder was, the larger the cyclical slit flow velocity would be. The cyclical slit flow rate increased to the maximum before the speed of the cylinder, the cyclical slit flow rate and the water velocity in the pipe intersect decreased to the minimum after that. Meanwhile mathematical model of the cyclical slit flow of concentricity under the moving boundary condition was established. The calculated values and experimental values are in substantial agreement and maximum relative error is no more than 8.5% , which showed the mathematical model is rational.