摘要
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 slurry pipeline transportation engineering,the particle size of the transport particles is larger,and the transport of coarse grain slurry with sliding bed flow is increasing.Based on the assumption of the linear distribution of the shear stress in the suspension layer on the sliding bed,a formula for calculating the position of the maximum velocity point（ i. e. the minimum shear stress point） is presented. The law of flow loss is applied in the direction of maximum flow velocity point to any point on the pipeline wall,and the calculation model of the velocity distribution of any point in the suspension layer is presented. By the experiment of gypsum ore slurry pipeline transportation,some experimental data of concentration distribution and velocity distribution are given. Based on the regression analysis of some data,the formula of the maximum velocity and the value of the Carmen constant κ are proposed. The calculation formula of the maximum velocity point position and the velocity distribution above the sliding bed are tested by experimental data,and the maximum deviation of the calculated and measured values are 3. 8% and 14. 3% respectively.
出处
《泥沙研究》
CSCD
北大核心
2017年第4期45-52,共8页
Journal of Sediment Research
基金
中国煤炭科工集团有限公司青年基金项目(2014QN040)
关键词
浆体
速度分布
滑动床
剪应力
slurry
velocity distribution
sliding bed
shear stress
作者简介
赵利安（1973-），男，陕西长安人，博士，讲师，主要从事浆体输送理论方面研究。E-mail：anlizha0@163．com
