具有肋条结构的气力输送弯管抗冲蚀优化设计  

Optimal Design for Anti-erosion of Pneumatic Conveying Elbow with Rib Structure

作　　者：郭姿含 张军[1] 李晖[1] GUO Zihan;ZHANG Jun;LI Hui(Fujian Province Key Laboratory of Energy Cleaning Utilization and Development,School of Marine Equipment and Mechanical Engineering,Jimei University,Xiamen 361021,China)

机构地区：[1]集美大学海洋装备与机械工程学院、福建省能源清洁利用与开发重点实验室,厦门361021

出　　处：《中国腐蚀与防护学报》2023年第3期525-534,共10页Journal of Chinese Society For Corrosion and Protection

基　　金：福建省自然科学基金(2022J01334和2020J01694)。

摘　　要：弯管冲蚀是不可忽视的重要问题,直接关系到管路输送系统的安全运行及管道的使用寿命。针对这一问题,提出一种四边形、等腰梯形和等腰三角形3种横截面形状的肋条,分别安装在弯头外径方向不同位置,并考虑均匀安装多个肋条对冲蚀的影响。采用CFD-DPM方法对所提出的具有肋条结构的弯管抗冲蚀特性进行数值模拟。模拟结果表明:肋条安装在颗粒壁面第一次碰撞之前,一定程度上抑制冲蚀,且肋条背部形成低速逆流循环区,保护该区域壁面。3种不同横截面形状的肋条中,抗冲蚀作用最佳的为等腰三角形肋。肋深越大,保护范围越大,但影响颗粒碰撞角度,增大颗粒与其碰撞频率,并非深度越大抗冲蚀性能越佳。弯头部分均匀分布多个肋条也具有明显的抗冲蚀特性。其结论可为弯管的抗冲蚀优化设计提供新的设计方案。Elbow erosion is an important matter related directly to the safe operation of pipeline conveying system and the service life of pipeline.To relieve the harmful effect of this kind of erosion,ribs with different shapes such as quadrilateral,isosceles trapezoid and isosceles triangle sections were designed and prepared,which then were installed at different designed positions in the inner edge on the half side of the elbow with large curvature radius,and the effect of evenly installing multiple ribs on the erosion process was also considered.CFD-DPM method was used to simulate the erosion resistance of the elbow with rib structure.The results show that if the rib is installed just behind the leading edge of the particle impact on the elbow wall,the existence of rib can change the trajectory of the particles,inhibit the erosion to a certain extent,and induce the formation a low-speed counter current circulation zone on behind the rib to protect the elbow wall in this area.Among the three proposed ribs of different cross sections,the isosceles triangular ribs have the best anti-erosion effect.The greater the rib thickness is,the greater the protection range is.However,the rib thickness does affect the impact angle of particles and increase the collision frequency of particles,therefore,a proper rib thickness may be carefully selected for acquiring the better anti-erosion performance.The isosceles triangular ribs with a rib thick in 6 mm have the best anti-erosion effect atθ=25°,which is 43.63%higher than that of ordinary curved tubes.Many ribs evenly installed on the elbow also have obvious anti-erosion effect,in fact,installation of 8 ribs with isosceles triangular cross section have the best anti-erosion performance.The conclusion can provide a new reference for the anti-erosion optimization design of elbow.

关 键 词：气力输送 弯管 肋条 截面形状 冲蚀 数值模拟 

分 类 号：TH232[机械工程—机械制造及自动化]