折流圈结构对折流杆换热器壳程的性能仿真与优化研究

Performance Simulation and Optimization Research of the Baffle Structure on the Shell Side Performance of the Baffle Heat Exchanger

折流杆换热器的强化传热研究主要集中在折流杆结构上,对折流圈结构影响的研究较少,折流圈的紧缩流对折流杆换热器流动与传热起着至关重要的作用。通过采用CFD软件Fluent"分段建模,分段分网,分段模拟,最后综合"的方法,对不同壳体直径折流杆换热器在不同折流圈宽度与壳体内径比下进行流动与传热分析。研究发现,在相同的折流圈宽度与壳体内径比下,折流杆换热器壳体内径每增加10%,其Nu数增加0. 7%,阻力系数fe增加2. 4%,综合性能Nu/fe降低1. 6%。对于相同壳体直径折流杆换热器,其折流圈宽度和壳体内径比增加,其传热能力得到加强,阻力损失不断增大,综合性能先增加后减小,折流圈设计最优推荐值ζ为4%~6%。

The research on the heat transfer enhancement of the baffle rod heat exchanger has been mainly focused on the baffle rod structure,and there are few studies on the influence of baffle structure. The flow of the buckling ring to the flow and heat transfer of the baffle rod heat exchanger plays a vital role. this paper adopts the CFD software Fluent of ’segment modeling,segmentation network,segmentation simulation,and finally synthesis ’,which is used for different housing diameter baffle rod heat exchangers in different baffles. The flow and heat transfer analysis were carried out under the ratio of the width to the inner diameter of the shell. It was found that under the same ratio of the width of the baffle ring to the inner diameter of the shell,the inner diameter of the baffle heat exchanger shell increased by 10%,and the Nu number increased by 0. 7%. The resistance coefficient fe increased by 2. 4%,and the overall performance Nu/fe decreased by 1. 6%. For the same housing diameter baffle rod heat exchanger,the ratio of the baffle width and the inner diameter of the casing increases,the heat transfer capacity is enhanced,the resistance loss is continuously increased,the comprehensive performance is first increased and then decreased,and the baffle design is the most The recommended value is 4% ~ 6%.