摘要
由于污垢管层与流层之间存在相互耦合现象,加之实际检测中不具备多物理场耦合开展条件,化工换热管道中传统热阻法无法实现污垢定量分析。为解决上述问题,提出采用超声时域检测法,结合Comsol Multipysics多物理场仿真软件,对声-固耦合加速度边界进行设计优化,开展化工换热污垢管道超声检测瞬态传播特性研究,实现污垢厚度特征定量提取。结果表明:优化后的模型能准确反映换热污垢管道流场与固场传播特性分布规律,弥补了工程运用中无法展开多物理场耦合分析的局限性,超声波对管道沉积污垢的检测误差在±3%左右,证明了数值仿真的可行性与准确性。仿真结果对工程在役换热集输系统超声检测和腐蚀防范提供了仿真依据和理论支撑。
Concerning the shortcomings of the conventional thermal resistance method for the chemical heat transfer pipelines,an ultrasonic time-domain detection method is proposed in the paper.Because that mutual coupling phenomenon exits between dirt pipe layer and fluid layer,actual detection does not have the conditions to carry out multi-physics coupling,based on a multiphysics simulation software,Comsol Multiphysics,we designed and optimized the acceleration boundary of acoustic-solid coupling,and researched transient propagation characteristics of ultrasonic heat transfer fouling pipeline,so as to achieve the quantitative characteristics of dirt thickness extraction.Resuits show that the optimized model is able to reflect the distribution laws of propagation characteristics for both the flow field and the solid field,which can make up the limitation of multi-physics coupling analysis,and the detection error of deposited fouling on thin plate performed is within a range of about 3%.Such results prove both the feasibility and accuracy of numerical simulation.
出处
《计算机仿真》
北大核心
2017年第3期404-409,共6页
Computer Simulation
基金
国家自然科学基金(51176028)
吉林省科技发展计划项目(20140204030SF)
关键词
换热污垢管道
超声检测
多物理场耦合
数值仿真
Heat exchange fouling pipeline
Ultrasonic detection
Multiphysics coupling
Numerical simulation
