具有仿生内表面结构的弯管抗冲蚀特性数值分析  

Numerical Analysis of Erosion Resistance of Elbow with Bionic Inner Surface Structure

作　　者：郭姿含 张军[1,2] 黄金满 李晖 GUO Zi-han;ZHANG Jun;HUANG Jin-man;LI Hui(School of Marine Equipment and Mechanical Engineering,Jimei University,Fujian Xiamen 361021,China;Fujian Provincial Key Laboratory of Energy Cleaning Utilization and Development,Fujian Xiamen 361021,China;Xiamen Anmaixin Automation Technology Co.,Ltd.,Fujian Xiamen 361021,China)

机构地区：[1]集美大学海洋装备与机械工程学院,福建厦门361021 [2]福建省能源清洁利用与开发重点实验室,福建厦门361021 [3]厦门安麦信自动化科技有限公司,福建厦门361021

出　　处：《表面技术》2023年第5期90-100,共11页Surface Technology

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

摘　　要：目的 管道冲蚀是气固两相流动中不可忽视的重要问题,直接影响管路系统的安全运行及管道的使用寿命。针对这一问题,从仿生学角度,参照沙漠红柳、沙漠蝎子等的体表形态,设计三角形槽、矩形槽、等腰梯形槽3种抗冲蚀特性的弯管仿生表面结构。方法 运用CFD-DPM方法,采用Finnie冲蚀模型,考虑颗粒与流体的双向耦合作用,对所设计的具有仿生表面结构的弯管抗冲蚀特性进行模拟,并考虑不同流速、颗粒质量流量对冲蚀的影响。在数值模拟基础上,采用正交试验法分析三角形槽仿生结构的3个主要参数对抗冲蚀特性的影响。结果 数值模拟结果表明,具有仿生表面结构的弯管冲蚀主要出现在弯头35°~60°区域槽的底部。3种槽表面仿生结构均可提高弯管的耐磨性,三角形槽的抗冲蚀特性最佳,提高了约38.33%,矩形槽次之,提高了约28%,等腰梯形槽最差,仅提高了约8.33%,且3种仿生表面结构的抗冲蚀性能优劣次序不随流速和颗粒质量流量的变化而变化;正交试验结果表明,在三角形槽中影响冲蚀的因素依次为槽间距、槽宽、槽深,最佳组合结构的抗冲蚀性能相较于普通弯管提升了约41.5%。结论 槽形仿生表面结构减小了颗粒与壁面的碰撞,降低了碰撞速度,从而减小了冲蚀。抗冲蚀性能最优的表面仿生结构为三角形槽,矩形槽次之,等腰梯形槽最差。在三角形槽中影响冲蚀的因素依次为槽间距、槽宽、槽深。该研究可对弯管的抗冲蚀特性设计提供新的思路。Pipeline erosion is an important problem that cannot be ignored in gas-solid two-phase flow.Erosion damages not only waste materials,consume energy and reduce equipment efficiency,but also accelerate equipment failure and reduce service life of equipment,resulting in greater economic losses.To solve this problem,from the perspective of bionics,the anti-erosion characteristics of transverse groove bionic surface with the triangle groove,rectangle groove and isosceles trapezoidal groove in gas-solid two-phase flow elbow were designed by referring to the body surface morphology of desert tamarisk and desert scorpion,and the erosion law of the elbow with bionic surface was discussed under different flow rates and mass flow rates.The best combination of erosion resistance was obtained by orthogonal test simulation design.CFD-DPM method,Finnie erosion model and Realizable k-ε model with vortex modification were adopted to carry out numerical simulation on the anti-erosion characteristics of the elbow with bionic surface structure by considering the bidirectional coupling between particle and fluid and study the effect of different flow rates and particle mass flow rates on the erosion.On the basis of numerical simulation,orthogonal test method was used to analyze the effect of three main parameters of the triangle groove bionic structure on anti-erosion characteristics.The numerical simulation results showed that the erosion of the elbow with bionic surface structure mainly occurred at the bottom of the groove in the 35°-60° area of the elbow,and the erosion was less in the concave area at the top.The three kinds of groove surface bionic structures could improve the wear resistance of the elbow.The maximum erosion rate of the ordinary elbow was 1.2×10^(-4)kg/(m^(2)·s).The triangle groove had the best erosion resistance,and the maximum erosion rate was 38.33% higher than that of the ordinary elbow,followed by that of rectangle groove,which was 28% higher,and that isosceles trapezoidal groove,which was only 8.33% hi

关 键 词：弯管 CFD-DPM 冲蚀 气固两相流 仿生表面 数值模拟 三角形槽 

分 类 号：TH117[机械工程—机械设计及理论]