中文摘要：

为了进一步探究动边界同心环状缝隙流的水力特性，采用理论分析与模型试验相结合的方法研究了直径比对动边界同心环状缝隙流轴向速度和动水压强的影响，结果表明：随着直径比k的增大，环状缝隙流的平均速度先增大后减小，且k＝0．6时达到最大值。缝隙流的平均速度和圆柱体的运行速度在最优直径比ke处相交，且与管道水流的平均速度相差最小，当Re ＝137 094 和Re ＝205 640 时，ke 值为0． 7 ～0． 8，且Re 越大，ke 越小。当k 依次为0． 5、0． 6、0． 7 时，从圆柱体外壁到管道内壁环状缝隙流的轴向速度先增大后减小，压强先减小后增大；当k ＝ 0． 8 时，轴向速度逐渐减小，压强逐渐增大，并且随着直径比的增大，轴向速度最大值和压强最小值出现的位置都向圆柱体外壁移动。

英文摘要：

In order to further explore the cyclical slit flow of concentricity under the moving boundary condition,the influence of the diameter ratio on cyclical slit flow of concentricity under the moving boundary condition were mainly analyzed by the combination of theoretical analysis and model experiments. The results show that,the cyclical slit flow average speed increases firstly and then decreases as the diameter ratio is enlarged and the maximum appears in 0. 6. The average flow velocity and the speed of the cylinder intersect at the optimum diameter ratio ke,and the difference is the smallest comparing with the average speed of pipe flow. Re =137094 and Re =205640,ke is between 0. 7 and 0. 8 and becomes larger as Re increases. Axial velocity increases firstly and then decreases and the pressure decreases firstly and then increases from the cylinder outer wall to pipeline inner wall when diameter ratios are 0. 5,0. 6 and 0. 7,however the axial velocity decreases and pressure increases gradually when diameter ratio is 0. 8. The max axial velocity and the min pressure move toward the cylinder outer wall with the increase of diameter ratio.