Analysis of influence of heat exchangerfouling on heat transfer performancebased on thermal fluid coupling

A study on heat transfer performance by thermal fluid coupling simulation for the fouling in a shell-tube heat exchanger used in engineering was presented. The coupling simulation was performed in a fluid and solid domains under three different fouling conditions: fouling inside the tube, fouling outside the tube, and fouling inside the shell. The flow field, temperature, and pressure distributions in the heat exchanger were solved numerically to analyze the heat transfer performance parameters, such as thermal resistance. It is found that the pressure drop of the heat exchanger and the thermal resistance of the tube wall increase by nearly 30% and 20%, respectively, when the relative fouling thickness reaches 10%. The fouling inside the tube has more impact on the heat transfer performance of the heat exchanger, and the fouling inside the shell has less impact.

基于热流固耦合的架空管道方形补偿器有限元分析

以某化工园区的架空管道方形补偿器为研究对象,该补偿器管廊有10组立柱、4层管架及27根管道,输送不同温度和压力工况的流动介质。在考虑重力、介质温度、流动对管道作用力等因素的基础上,系统、完整地建立ANSYS有限元模型,并进行了热流固耦合计算,得到了架空管道方形补偿器的位移、轴力、剪力、弯矩及应力等参数分布,找出这些参数的最大值及其位置,对二次应力进行校核验算,判断了方形补偿器的可靠性。旨在探索一套针对复杂架空管道实际应用的安全风险评估方法,为架空管道的运行安全提供技术支持。

CAE技术在流体机械及工程中的应用研究

介绍了有关CAE技术在流体机械工程中的单个静设备、动设备以及多个设备系统应用的方法和成果。涉及的静设备有储罐、塔、换热器,动设备有离心泵、液环泵和螺杆泵,多个设备系统有消防供水系统和架空管道系统等。讨论了流体机械及工程仿真中常见的流固耦合、动静计算域设置、连续相-离散相模型、单个设备与多个设备系统尺度等CAE技术问题。对单个设备而言,先进行流场计算以确定结构计算的流动载荷条件,再进行有限元计算和模态分析。对于多个设备的系统,以关注系统稳态或瞬态的工作性能为主,便于完成设备的选型与评估、有针对性地制定安全防护措施。最后对CAE技术在流体机械及工程中的应用前景做了展望。