【作者】 刘占斌；

【导师】 李淑娟； 袁启龙；

【作者基本信息】 西安理工大学 ， 机械制造及其自动化， 2008， 硕士

【摘要】 换热器是工业传热过程中必不可少的设备,广泛应用于各工业部门。随着科技及工业的发展,要求换热设备紧凑、轻巧、高效并小型化,翅片管换热器和板式换热器成为人们关注较多的两种高效换热器。其中翅片管作为翅片管换热器的核心元件,其质量的优劣直接影响到热交换器的工作性能。本文通过对采用切削一挤压复合成形方法加工的翅片管进行三维有限元分析,研究其热交换过程和传热效果,以便指导其优化设计与加工。采用三维实体造型软件(CATIA)构建翅片管换热器的三维实体简化模型;选用ANSYS ICEM CFD生成六面体网格,以ANSYS CFX为仿真工具,将流体与翅片管的接触面设置为流固恒热流耦合传热边界,完成了翅片管换热器模型的建立和模拟计算过程;针对模拟计算结果,分别分析了翅片管结构参数、翅片管内外流体对换热效果的影响,获得了翅片间距、厚度、高度以及翅片管外不同流体种类对换热效果的影响规律。建立了研究翅片管换热特性的实验平台;通过对翅片管强制对流换热过程的数值模拟,获得了其平均传热系数。实验结果表明,翅片间距对平均传热系数影响最大,翅片厚度次之,翅片高度最小;平均传热系数随翅片高度的增大而增大;随翅片间距的减小而增大;随翅片厚度的增大,先增大后减小。通过翅片管的传热优化分析,获得翅片管最优结构参数,实验结果验证了翅片管数值模拟过程的正确性。更多还原

【Abstract】 Heat exchanger is indispensable in process of industrial heat transfer,and is widely used by each department on industry.With the development of technology and industry,heat exchangers are required of compactness,portability,high efficiency and miniaturization.The fin tube heat exchanger and plate heat exchanger are paid more concentration by people.Fin tubes are the key part of fin tube heat exchangers,which quality are directly related to working characteristic of heat exchanger.In this thesis,in order to optimize design and manufacture,the heat exchanging process and heat transfer effect of fin tube,which is manufactured by means of cutting-extrusing composite technics,are studied with 3D-finite element analysis method.The simplified 3-D solid model is built with an 3-D solid modeling software(CATIA).The hexahedral element mesh is generated with ANSYS ICEM CFD.Using ANSYS CFX as simulation tool,setting interfaces between fluid and fin tube as fluid-solid coupled heat transfer boundary in condition of invariable heat flux,model establishment and simulation computation of fin tube heat exchanger are completed.According to simulation results,analyzing the effect of fin tube structure parameters and fluid around fin tube on heat transfer effect,the influence law that pitch,thickness & height of fin and different types of fluid around fin tube affect heat exchange effect is obtained.An experimental platform of researching heat exchange performance of fin tubes is built. Average heat transfer coefficient is obtained by means of numerical simulation of forced convection heat transfer around fin tube.The experiment results indicate that the effect of fin height on average heat transfer coefficient comes first,the fin spacing second,the fin thickness last.The average heat transfer coefficient increases at the previous period and decrease at the later period with the increase of the thickness of fins,while it increases with the decrease of fin spacing and the increase of fin height.With optimization analysis of heat transfer,optimum structure parameters of fin tube are obtained,and the experiment results confirms the validity of numerical simulation.更多还原