基于Kriging模型的螺旋波纹管流动换热特性及结构优化  

Flow and Heat Transfer Characteristics and Structure Optimization of Helically Corrugated Tubes Based on Kriging Model

作　　者：郑智群 黄贤振[1] 姜智元 苗兴琳 ZHENG Zhi-qun;HUANG Xian-zhen;JIANG Zhi-yuan;MIAO Xing-lin(School of Mechanical Engineering&Automation,Northeastern University,Shenyang 110819,China.)

机构地区：[1]东北大学机械工程与自动化学院,辽宁沈阳110819

出　　处：《东北大学学报（自然科学版）》2024年第7期992-1001,共10页Journal of Northeastern University(Natural Science)

基　　金：国家自然科学基金资助项目(51975110,U22B2087);中央高校基本科研业务费专项资金资助项目(N21003005).

摘　　要：在螺旋管式换热器的基础上结合波纹结构,设计出一种新型的螺旋波纹管换热器.通过数值计算研究了不同波纹深度和波纹节距对其流动换热的影响.以数值计算结果训练Kriging模型,训练后的Kriging模型可预测大量不同螺旋波纹结构特征样本的流动换热特性.通过筛选摩擦系数较低且换热效率较高的结构参数以实现螺旋波纹管换热特性优化.结果表明,波纹结构产生的流速突变和螺旋结构产生的二次流提高了换热效率和流动阻力.通过与数值计算结果的对比,Kriging模型预测换热特性具有较高的效率和精度.在所选定的参数范围内,当波纹深度、波纹节距、螺旋中径、螺旋节距分别为1.32,27.99,86.49,57.85 mm时,螺旋波纹管具有较低的摩擦系数和较高的换热效率.Building on the helical tube heat exchanger integrated with a corrugated structure,a novel type of helically corrugated tube heat exchanger is designed.Numerical simulations are conducted to investigate the effects of varying corrugation depths and pitches on flow and heat transfer performance.After the Kriging model is trained with numerical computation results,it can then predict the flow and heat transfer characteristics of a larger number of helically corrugated tube samples with different structure features.The structural parameter with a lower friction coefficient and a higher heat transfer efficiency are screened to optimize the heat transfer characteristics.The results indicate that the sudden change in the flow velocity generated by the corrugated structure and the secondary flow generated by the helical structure improve both heat transfer efficiency and flow resistance.The Kriging model has higher accuracy and efficiency in predicting the heat transfer characteristics.In the selected range of structural parameters,the helically corrugated tubes have a lower friction coefficient and a higher heat transfer efficiency when the corrugation depth,corrugation pitch,helical diameter,and helical pitch are 1.32,27.99,86.49,57.85 mm,respectively.

关 键 词：螺旋波纹管 数值模拟 换热 KRIGING模型 优化设计 

分 类 号：TK172[动力工程及工程热物理—热能工程]