期刊论文

Research and Optimization of Air Side Heat Transfer Characteristics of Air-Cooled Condenser with Variable Diameter Tube

中文

同济大学学报. 自然科学版

Tongji Daxue Xuebao/Journal of Tongji University

0253-374X

2017

45

4

589-595

10.11908/j.issn.0253-374x.2017.04.018

国家国际科技合作专项(2014DFA10610)

本校为其他机构

针对四排等管径圆管直接空冷凝汽器冬季因换热不均易产生冻结的情况,提出了采用变管径翅片管束的思想。用计算流体力学(CFD)方法,对变管径翅片管束的流动换热特性进行数值模拟。研究发现,变管径翅片管束相比于等管径翅片管束,换热均匀性大幅提升,综合性能也有所提高;为提高该类换热器换热性能,将管束排布方式由近等边变化到近等速,凝汽器综合性能增大而换热均匀性变化不明显;在近等速排列变管径管束的翅片上加装涡发生器,综合性能进一步提高,换热均匀性对雷诺数的敏感性有所改变。

In view of the freeze due to the uneven heat transfer of the four-row-tube direct air-cooled condenser, the idea of using variable diameter finned-tube bundles was put forward. Using the method of computational fluid dynamics (CFD), the numerical simulation of heat transfer characteristics of a variable diameter finned-tube bundles was conducted. It is found that the comprehensive performance and heat transfer uniformity of variable diameter finned-tube bundles are improved compared with the equivalent diameter finned-tube bundles. At the same ...