高聚物溶液二维突扩中层流流动特性研究  

Study on laminar flow characteristics in two-dimensional sudden expansion of polymer solution

作　　者：张浩[1,2] 李炳炘 石若冉 孙国梁 玄克勇 ZHANG Hao;LI Bingxin;SHI Ruoran;SUN Guoliang;XUAN Keyong(School of Thermal Engineering,Shandong Jianzhu University,Jinan 250101,China;Shandong Collaborative Innovation Center of Green Building,Jinan 250101,China;Shandong Linli Architectural Design Company,Jinan 250014,China)

机构地区：[1]山东建筑大学热能工程学院,山东济南250101 [2]山东省绿色建筑协同创新中心,山东济南250101 [3]山东林李建筑设计有限公司,山东济南250014

出　　处：《山东建筑大学学报》2025年第1期41-48,70,共9页Journal of Shandong Jianzhu University

基　　金：山东省专业学位研究生教学案例库项目(SDYAL20162);山东省研究生优质课程建设项目(SDYKC19117)。

摘　　要：高聚物溶液对管道输运系统具有减阻增输作用。文章采用非线性FENE-P黏弹性模型描述高聚物溶液的黏弹性,选用不同突扩比管道,模拟并对比研究纯水工况和高聚物溶液工况的二维平面突扩中的层流流动特性,分析高聚物溶液减阻效果。结果表明:速度在突扩面处增加显著,且在对称流动阶段速度分布曲线与突扩比无关,当雷诺数Re增至20后,速度分布只与雷诺数有关;在对称流动阶段,压力沿轴向对称分布;而在不对称流动阶段,突扩面后上方的小回流区域出现低压区,壁面处小回流区和大回流区末端均出现高压区;高聚物溶液的分子拉伸长度和黏度比的影响为单调的,而魏森伯格数Wi有临界点。Polymer solution has the function of reducing drag and increasing transport in pipeline transportation system.In this paper,nonlinear FENE-P viscoelastic model is used to describe viscoelasticity of polymer and different sudden expansion ratios are selected.The laminar flow characteristics of two-dimensional planar expansion in pure water and polymer solution are simulated and compared,and the drag reduction effect of polymer solution is analyzed.The results indicate that the velocity increases significantly at the sudden expansion surface,and in the symmetric flow stage,there is no relation between the velocity distribution curve and the sudden expansion ratio.When the Reynolds number Re increases to 20,the velocity distribution is only related to the Reynolds number.In the phase of symmetrical flow,the pressure is distributed symmetrically along the axis;in the phase of asymmetric flow,a low pressure area appears in the small recirculation zone above the sudden expansion surface,and high pressure area appears at the end of small recirculation zone and large recirculation zone on the wall.The influence of molecular tensile length and viscosity ratio are monotonous,and Weissenberg number Wi has a critical point.

关 键 词：高分子聚合物 二维突扩 层流流动 数值模拟 

分 类 号：TV134[水利工程—水力学及河流动力学]