气固两相Y型分支管网流量分配特性的试验研究与数值模拟

在水平Y型分支管道中,采用压缩空气作为输送动力,小米作为输送介质进行气力输送试验,对分支管道的固体流量分配特性进行了研究.试验表明,变动支管与主管中轴线夹角与气体表观速度对固相分配特性具有较大影响.同时,采用Euler-Lagrange两相流研究方法,固相采用离散相(DPM)模型,采用Fluent软件对3种不同夹角的Y型分支管内气固两相流动进行了数值模拟.模拟结果较好地预估了颗粒在分支处的流动形态、颗粒在分支管内的运动轨迹,以及重新实现颗粒相流场均匀分布所需的距离.通过对分支管内固体颗粒质量分配的数值模拟结果与试验结果比较,发现两者之间相对误差较小.

Experimental Study and Numerical Simulation of the Flow Distribution Characteristics of a Gas-solid Two-phase Y-shaped Branch Pipe Network

By using compressed air as conveyance power and millet as a transport medium in horizontal Y-shaped branch pipes,the solid flow distribution characteristics of the above pipes were studied.The test results show that the change of the included angle between the central axial lines of the branch and main pipes as well as the superficial gas velocity have a relatively big influence on the solid-phase flow distribution characteristics.In the meantime,by adopting Euler-Lagrange two-phase flow research method and a discrete phase model (DPM) for the solid phase,the authors have employed Fluent software to numerically simulate the gas-solid two-phase flow in the Y-shaped branch pipes having three different included angles.The simulation results have predicted relatively well the flow pattern of particles at the branch points,the movement trajectory of the particles inside the branch pipes and the distance required for resuming a uniform distribution of the particle phase flow field.By comparing the numerical simulation results with the test ones of the solid particle mass distribution in the branch pipes,the authors have found that there exists a relatively small error between the two results.