管道车在不同雷诺数条件下的输送特性

Transportation characteristics of piped carriage with different Reynolds numbers

针对传统运输工具存在的能源危机问题,提出了筒装料管道水力输送技术,设计了一套旨在研究管道车输送特性的智能试验系统.通过对管道车进行动力学分析,划分了管道车的运动阶段,揭示了管道车运动的主要动力来源.采用理论分析与模型试验相结合的方法,探讨了管道车在不同雷诺数条件下的输送特性.试验结果表明:随着雷诺数的增大,管道车的运行速度、环状缝隙流速以及管内水流速度都增大,但增大的幅度不同,即环状缝隙流速的增幅最小,管内水流速度次之,管道车速度的增幅最大.当管道车运行速度、环状缝隙流速以及管内水流速度三者相等时,管道车的运行是最平稳的.此外,随着雷诺数的增大,管道车的输送量呈现先增大后减小的趋势,雷诺数范围在160 000～210 000时,输送量最大.最后,根据质量守恒定律建立了管道车在不同雷诺数条件下运动的数学模型,并与试验结果进行了对比分析,其最大相对误差不超过9%.

In order to solve the problems of the existing energy crisis caused by traditional means of transport,a piped hydraulic transportation technique of tube-contained raw material was put forward and an intelligence test system was designed to research the transportation characteristics of the piped carriage.Through dynamic analysis,the motional stages of the piped carriage were divided and the main power source of the motion of the piped carriage was indicated.With combination of theoretical analysis and model experiments,the transportation characteristics of the piped carriage with different Reynolds numbers were studied.The results show that the larger Reynolds number is,the larger the conveying speed of the piped carriage,the cyclical slit flowing rate and the water velocity in the pipe are,but their increase ranges are different.The conveying speed of the piped carriage increases the most,water velocity in the pipe and the cyclical slit flowing rate increases the least.When the speed of the piped carriage,the cyclical slit flowing rate and the water velocity in the pipe are equal,the piped carriage moves the most smoothly and steadily.Additionally,the conveying capacity of the piped carriage increases firstly and then decreases with the increasing of Reynolds number.While Reynolds number falls in about 160 000～210 000,the capacity reaches the maximum.Meanwhile,the motional mathematical model of the piped carriage was established with different Reynolds numbers according to the law of conservation of mass and a comparative analysis was done on its results and the experiment results.The maximum relative error is less than 9%.