折流杆换热器流路干涉分析

摘要

The flow path analysis is the most advanced method to study the baffle plate heat exchanger so far.In this paper,the flow path analysis is applied to the baffle heat exchanger.The baffle heat exchanger is divided into X,C and E flow paths to form the interference analysis based on the C flow path and the E flow path.Using CFD software Fluent,three kinds of baffle heat exchanger models based on separate X flow path,X,C mixed flow path and X,C and E full flow path are constructed respectively.And the flow and heat transfer study is carried out.The results show that the Nu of X and C mixed flow heat exchangers increase by 86％,while the average resistance increases by 33％and the comprehensive performance increases by 39％,and the full flow model is mixed with the X and C.The heat transfer capacity decreased by 5.74％,the pressure drop decreased by 0.72％,and the comprehensive performance decreased by 4％.It shows that the interference of C flow path,which is often neglected in traditional sense,plays a key role in the flow and heat transfer performance of the baffle heat exchanger.The comparison between the full flow model and the experimental data and the experimental correlations proposed by C.C.Gentry shows that the results are in good agreement.%流路分析法是迄今为止研究折流板换热器最先进的方法,本文采用流路分析的思路运用于折流杆换热器,将折流杆换热器分成X、C、E流路,形成基于C流路和E流路的干涉分析;应用CFD软件Fluent分别构建出了基于单独X流路,X、C混合流路以及X、C、E全流路的三种折流杆换热器模型,并对其进行了流动与传热研究,结果显示X、C混合流路换热器的Nu相对与单独X流路平均增加了86％,而阻力平均增加了33％,综合性能平均增加了39％;,全流路模型相对于X、C混合流路,传热能力减少了5.74％,压降减少了0.72％,综合性能降低了4％.说明传统意义上经常被忽略的C流路的干涉作用对折流杆换热器流动与传热性能起着关键性的影响.并将全流路模型与实验数据和C.C.Gentry提出的实验关联式进行对比,结果显示符合良好.