山东建筑大学学报2023，Vol.38Issue(6)：31-38,8.DOI:10.12077/sdjz.2023.06.005
突扩管中高分子聚合物溶液湍流减阻的数值模拟
Numerical simulation of turbulent drag reduction of polymer solution in a sudden expansion
摘要
Abstract
The utilization of polymer additives for drag reduction stands as a crucial method in achieving reduced resistance in pipelines.As a common pipe fitting in the pipeline system,the study of the sudden expansion pipe flow holds significant importance for flow drag reduction and energy conservation.The numerical simulation method is used to examine the turbulent flow of the polymer PAM(polyacrylamide)solution in a sudden expansion pipe through the Cross model,and the flow field,drag reduction patterns and the variations in the recirculation zone are also analyzed.Results indicate that,the pressure recovery maximum of PAM solution is greater than that of water under the same Reynolds number.The drag reduction rate in the upstream straight pipe exhibits an initial increase followed by a decrease with the rise of Reynolds number.The local resistance coefficient of sudden expansion in PAM solution increases with the increase of Reynolds number,and shows a drag reduction effect,but the drag reduction rate is noticeably lower than that of the straight pipe.Furthermore,under the same Reynolds number,the length of the recirculation zone in PAM solution experiences an increased length compared to pure water.This alteration and the observed drag reduction effect are related to the change of turbulent kinetic energy.关键词
突扩管/高分子聚合物/减阻Key words
sudden expansion/high molecular polymer/drag reduction分类
建筑与水利引用本文复制引用
石若冉,张浩,张志,李茂林..突扩管中高分子聚合物溶液湍流减阻的数值模拟[J].山东建筑大学学报,2023,38(6):31-38,8.基金项目
山东省专业学位研究生教学案例库项目(SDYAL20162) （SDYAL20162）
山东省研究生优质课程建设项目(SDYKC19117) （SDYKC19117）
