多流程板壳式换热器流量分布特性的模拟与优化  

Numerical Simulation and Optimization on Fluid Flow Distribution Performance of Multi-passes Plate and Shell Heat Exchanger

作　　者：袁雨文 赵巍[1] 刘家瑞 刘业凤[1] YUAN Yu-wen;ZHAO Wei;LIU Jia-rui;LIU Ye-feng(School of Energy and Power Engineering,University of Shanghai for Science and Technology,Shanghai,China,200093;SDAAC Automotive Air-Conditioning Systems Co.Ltd.,Shanghai,China,201204)

机构地区：[1]上海理工大学能源与动力工程学院,上海200093 [2]上海爱斯达克汽车空调系统有限公司,上海201204

出　　处：《热能动力工程》2020年第4期135-145,共11页Journal of Engineering for Thermal Energy and Power

基　　金：国家自然科学基金(51176124);上海市浦江人才计划(17PJ1407200)。

摘　　要：以多流程板壳式换热器为研究对象,建立了板程与壳程的物理模型并进行数值模拟,分析了流速、流道数对流量分布特性的影响及流量分布特性对传热效率、压降的影响。通过增大导孔直径和改变入口角度对板程进行了优化,通过设置双入口和增加挡板对壳程进行了优化。研究表明:多流程板壳式换热器的板程与壳程均存在严重的流量分布不均匀现象,且板程要比壳程更为严重,不均匀性会随流速和流道数的增大而增大,并导致板程传热效率下降6%~14%、壳程下降2%~5%,且均造成压降的增大;增大导孔直径和改变入口角度均有利于板程流量的均匀分布,但效果有限,双入口模式可以很好地改善壳程流量分布的不均匀性,而添加挡板虽使不均匀性降低,但是造成了压降的增大。A geometric model of multi-passes plate and shell heat exchanger(PSHE) is established,and the numerical simulations are performed.The deviations and the relative standard deviation of the mass flow are calculated,and the fluid flow distribution performances of plate-side and shell-side are analyzed.The influences of fluid flow distribution performance on heat transfer efficiency and pressure drop are concluded.Enlarging the inlet groove diameter and changing the angle of inlet pipeline can optimize the performance of plate-side,and installing double inlets and adding a baffle can optimize that of shell-side.Results indicate that there are always uneven fluid flow distribution on both plate-side and shell-side,and the plate-side is more seriously.Moreover,the uneven fluid flow distribution increases with the increase of flow rate and passes,and it also leads to the descending of heat transfer efficiency,6%-14% for and 2%-5% for shell-side,and widely increases the pressure drop.The method of enlarging the inlet groove diameter and changing the angle of inlet pipeline of plate-side can improve the impact of the uneven fluid flow distribution but has limited effect.The method of installing double inlets has a great performance while the method of adding a baffle can drop the uneven fluid flow distribution but leads to the increase of pressure drop.

关 键 词：板壳式换热器 流量分布 数值模拟 优化设计 

分 类 号：TK172[动力工程及工程热物理—热能工程]