弹性管束结构改进及折流板对振动与传热性能的影响

Influence of Elastic Tube Bundle Structure Improvement and Baffle Plate on Vibration and Heat Transfer Performance

为提高弹性管束换热器的综合传热性能,基于传统弹性管束换热器,在内部增设折流板并对其传热元件进行结构改进。采用双向流固耦合计算法,对不同结构条件下4种弹性管束换热器的振动及传热特性进行了定性和定量对比分析。结果表明:管束结构改进及增设折流板均会增强弹性管束的振动强度,且弹性管束结构改进后各排管束的振动一致性提高;在弹性管束振动条件下,与无折流板的传统弹性管束换热器相比,仅对管束进行结构改进传热性能可提高12.51%,仅增设折流板可使管束传热性能提高25.28%,对管束进行结构改进并增设折流板可使管束传热性能提高28.57%;在弹性管束换热器结构不变的条件下,与非振动条件下的计算结果相比,管束结构改进可使管束传热性能提高6.53%,增设折流板可使管束传热性能提高5.09%,同时进行管束结构改进并增设折流板可使管束传热性能提高7.96%。

In order to improve the comprehensive heat transfer performance of elastic tube bundle heat exchangers,based on the conventional elastic tube bundle heat exchanger,the structure of the heat exchange element was improved and baffle plates were added inside.The vibration and heat transfer characteristics of four elastic tube bundle heat exchangers with different structures were compared qualitatively and quantitatively by using two-way fluid-solid coupling computation method.The results show that both the improvement of the tube bundle structure and the addition of baffle plates can enhance the vibration strength of the elastic tube bundle,and the vibration consistency of each row of tube can be enhanced after the improvement of the tube structure;compared with the conventional elastic tube bundle heat exchanger without baffle plates,the heat transfer performance of the tube can be enhanced by 12.51%only by improving the tube structure under vibration condition of elastic tube bundle,25.28%only by adding baffle plates,and 28.57%by both improving the tube structure and adding baffle plates;compared with the calculation results under non-vibration condition,the heat transfer performance of the tube can be improved by 6.53%by improving the tube structure,5.09%by adding baffle plates,and 7.96%by both improving the tube structure and adding baffle plates.