基于CFD-DEM方法的组合管路磨损特性研究  

Research on Wear Characteristics of Combination Pipeline Based on CFD-DEM Method

作　　者：彭光杰[1] 徐慕远 姬广超 常浩[1] PENG Guang-jie;XU Mu-yuan;JI Guang-chao;CHANG Hao(National Research Center of Pumps,Jiangsu University,Zhenjiang 212013,China)

机构地区：[1]江苏大学国家水泵及系统工程技术研究中心,江苏镇江212013

出　　处：《水电能源科学》2024年第12期72-76,共5页Water Resources and Power

摘　　要：鉴于管道磨损对于确保管道系统的安全、经济和可持续运行至关重要,基于计算流体力学——离散元耦合法(CFD-DEM),对一种由2个90°弯头组成的组合管路固液两相流磨损特性进行了数值模拟研究。结果表明,在颗粒体积浓度保持恒定的情况下,随着流速的增加,磨损率将呈指数型增长,并与碰撞速度的2.41次方成正比;随着颗粒浓度的增加,2个弯头的碰撞频率和磨损率的增长率出现了不同的变化,高浓度工况下管道内更易出现“护盾效应”;弯头间距的增大使得颗粒的流动更为充分,同时削弱了弯头内二次流的影响,导致颗粒与壁面接触的次数减少,碰撞频率和磨损率也随之降低;在相同浓度的混合粒径工况下,粒径的增加将导致弯头壁面的平均磨损率减少,然而大颗粒的惯性力增加将导致弯头壁面的最大磨损率增加。研究结果为组合管路的抗磨损性能提升提供了理论支撑。Studying pipeline wear is crucial for ensuring the safety,economy,and sustainable operation of pipeline systems.This article presents a study on the wear characteristics of solid-liquid two-phase flow in a combination pipeline consisting of two 90°elbows,using the CFD-DEM research method for numerical simulation.The results show that when the particle volume concentration remains constant,the wear rate will increase exponentially with the increase of flow rate,and is directly proportional to the 2.41 power of collision velocity;As the particle concentration increases,there are different changes in the collision frequency and wear rate of the two elbows,and the"shield effect"is more likely to occur in the pipeline under high concentration conditions;The increase in elbow spacing makes the flow of particles more thor-ough,while weakening the influence of secondary flow inside the elbow,resulting in a decrease in the number of contacts between particles and the wall,as well as a decrease in collision frequency and wear rate;Under the same concentration of mixed particle size conditions,increase of particle size will lead to a decrease in the average wear rate of the elbow wall;While increase of the inertia force of large particles will result in increase of the maximum wear rate of the elbow wall.This research results provide theoretical support for improving the wear resistance performance of combination pipeline.

关 键 词：组合管路 CFD-DEM 磨损特性 数值模拟 固液两相流 

分 类 号：TV134[水利工程—水力学及河流动力学]