以锥形螺旋弹性管束(conical spiral elastic tube bundle ,CSETB)换热器为研究对象，通过在换热器内增设脉动/引流折流板，以期获得具有更高传热性能的弹性管束换热设备。通过采用双向流固耦合计算方法，研究了不同壳程入口流速和不同结构方案下CSETB换热器的振动强化传热性能。研究表明：CSETB的振幅随流速的增加而增加，仅增设脉动折流板可使CSETB表现为相对大幅高频振动，同时增设脉动、引流折流板可使CSETB表现为相对大幅低频振动。增设折流板可使流体流动的规律性和温度场分布的层次性增强，且能使换热器的壳程传热能力获得大幅提高。振动能够实现强化传热，这种强化传热的程度在高流速时更明显，且增设折流板能明显提高CSETB的振动强化传热性能。此外，引流折流板的存在使换热器的综合传热性能降低。
Abstract
Based on the conical spiral elastic tube bundle (CSETB) heat exchanger, an elastic bundle heat transfer equipment with higher heat transfer performance can be obtained by installing pulsating/drainage baffle plate in the heat exchanger. The vibration enhancement performances of CSETB heat exchanger under different shell inlet velocities and different structural schemes were studied by using two-way fluid-structure coupling calculation method. The results show that the amplitude of CSETB increases with the increase of inlet velocity, and only installing pulsating baffle plate can make CSETB show relatively large high-frequency vibration, while both installing pulsating baffle plate and drainage baffle plate can make CSETB show relatively large low frequency vibration. The installation of baffle plate can enhance the regularity of fluid flow and the stratified distribution of temperature field, and can greatly improve the heat transfer ability of shell side of heat exchanger. Vibration can enhance heat transfer, and the degree of heat transfer enhancement is more obvious at high inlet velocity, and the installation of baffle plate can significantly improve the vibration enhanced heat transfer performance of CSETB. In addition, the existence of drainage baffle reduces the comprehensive heat transfer performance of heat exchanger.
关键词
锥形螺旋弹性管束 /
换热器 /
折流板 /
振动强化传热
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Key words
conical spiral elastic tube bundle /
heat exchanger /
baffle /
vibration-enhanced heat transfer
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