摘要
针对泥水平衡盾构机循环系统的排浆管道运输堵塞情况,基于计算流体力学(Computational Fluid Dynamics,CFD)和离散元(Discrete Element Method,DEM)双向耦合方法,模拟了波纹管道中泥浆和石材颗粒相互作用下的运输过程,研究了颗粒相和流体相随时间的演化。结果表明:波纹管道实现了向内波纹会聚管流场加速效应,泥浆通过波纹结构时流速显著增加,高速流域面积扩增;更多管道底部处石材颗粒与管壁的滑动摩擦变为滚动摩擦,降低了石材与管道间的摩擦磨损,且底部泥浆具有向上流动的趋势,使得石材颗粒获得向上的速度分量,分布在流场作用更强的位置;波纹管壁附近,湍流动能随着泥浆的流动而增大,泥浆与管壁的摩擦损失以及湍流流动带来的热能耗散则使得总压减小较为明显;波纹函数振幅增大或者周期减小均有利于缓解石材颗粒的堵塞情况,但周期过小会导致个别石材颗粒长时间滞留;在石材颗粒易堆积管段使用波纹加速结构能有效避免堵塞情况。
In response to the blockage situation in the discharge pipeline of the slurry circulation system in the slurry shield machine,a two-way coupling method based on Computational Fluid Dynamics(CFD)and Discrete Element Method(DEM)is used to simulate the transportation process of slurry and stone particles interacting in corrugated pipelines.The evolution of the particulate phase and the fluid phase over time was studied.The results show that:The corrugated pipeline achieves an accelerated effect on the converging pipe flow field with inward corrugations.The flow velocity of the slurry significantly increases when passing through the corrugated structure,and the high-speed flow area expands.More stone particles at the bottom of the pipeline change from sliding friction with the pipe wall to rolling friction,reducing the frictional wear between the stones and the pipeline,and the slurry at the bottom tends to flow upwards,giving the stone particles an upward velocity component,distributing them in a position with stronger flow field effects.Near the corrugated pipe wall,the turbulent kinetic energy increases with the flow of the slurry,while the friction loss between the slurry and the pipe wall and the thermal energy dissipation caused by the turbulent flow significantly reduce the total pressure.Increasing the amplitude of the corrugated function or decreasing the period is beneficial in alleviating the blockage of stone particles,but an excessively small period can cause individual stone particles to be retained for extended periods.Using a corrugated acceleration structure in pipe sections where stone particles tend to accumulate can effectively prevent clogging.
作者
廖异
张澳
陶铁军
刘恩龙
徐涛龙
Liao Yi;Zhang Ao;Tao Tiejun;Liu Enlong;Xu Taolong(School of Mechanical Engineering,Southwest Petroleum University,Chengdu 610500,P.R.China;Mining College,Guizhou University,Guiyang 550025,P.R.China;College of Water Resources and Hydropower,Sichuan University,Chengdu 610065,P.R.China;School of Petroleum and Natural Gas Engineering,Southwest Petroleum University,Chengdu 610500,P.R.China)
出处
《地下空间与工程学报》
北大核心
2025年第6期2112-2121,共10页
Chinese Journal of Underground Space and Engineering
基金
国家自然科学基金(52374068)
四川省自然科学基金(2023NSFSC0047)。
关键词
管道运输
流动特性
流固耦合
泥水盾构
堵塞
pipeline transport
flow characteristics
fluid-solid coupling
slurry shield
blockage
