螺旋折流板换热器结构参数多目标优化的数值模拟  

Multi-Objective Optimization on the Structural Parameters of Shell-and-Tube Heat Exchanger with Helical Baffles

作　　者：王斯民[1] 王萌萌[1] 顾昕[1] 简冠平[1] 文键[2] 

机构地区：[1]西安交通大学化学工程与技术学院,西安710049 [2]西安交通大学能源与动力工程学院,西安710049

出　　处：《西安交通大学学报》2015年第11期14-19,109,共7页Journal of Xi'an Jiaotong University

基　　金：国家自然科学基金资助项目(51106119;81100707);教育部高等学校博士学科点专项科研基金资助项目(20110201120052);中央高校基本科研业务费专项基金资助项目

摘　　要：针对螺旋角和搭接度对螺旋折流板换热器中的流体流动和传热特性具有重要影响的问题,采用数值模拟和多目标遗传算法优化结合的方法对螺旋折流板换热器的流动和传热特性进行了研究,并通过中心复合设计响应面法生成实验点进行了计算。研究表明:螺旋折流板换热器壳侧换热系数和压降均随螺旋角的增大而减小,随搭接度的增大而增大。由灵敏度分析可知,螺旋折流板换热器的换热系数和壳侧压降均与螺旋角呈负相关,与搭接度呈正相关,且二者对螺旋角的灵敏度更大。同时,由多目标遗传算法优化方法在连续的响应平面中得出使换热系数最大、壳侧压降最小时最优的3组结果,与原始结构相比,壳侧换热系数平均增加了28.3%,壳侧压降平均降低了19.37%,这对于螺旋折流板换热器结构参数的研究具有重要意义。A method combining numerical simulation and multi-objective genetic algorithm （MOGA） was applied to the flow and heat transfer characteristics research on the shell-and-tube heat exchanger with helical baffles, which are severely affected by the helix angle and degree of overlap. The numerical simulation results show that the heat transfer coefficient and the shell side pressure drop of the helical baffled heat exchanger decrease with the increase of helix angle, and increase with the degree of overlap. The sensitivity analysis also shows that the heat transfer coefficient of the helical baffled heat exchanger and shell side pressure drop are both negatively correlated with helix angle, and positively correlated with the overlap degree. Moreover, they are more sensitive to the helix angle. Three sets of optimal results are obtained by the MOGA to maximize the heat transfer coefficient and minimize the shell-side pressure drop in successive response surface. Compared with original results, the average heat transfer coefficient is increased by 28.30//oo while the average pressure drop is reduced by 19.37o//00, which is of great significance for the study on the structural parameters of helical baffled heat exchangers.

关 键 词：螺旋折流板换热器 多目标优化 结构参数 响应平面 

分 类 号：TK124[动力工程及工程热物理—工程热物理]