CIESC Journal ›› 2021, Vol. 72 ›› Issue (9): 4511-4522.DOI: 10.11949/0438-1157.20210512

• Fluid dynamics and transport phenomena • Previous Articles     Next Articles

Shell side high efficiency and low resistance performance of heat exchanger with bionic structures

Chenyue LIU1(),Tong ZHENG1,Yuanbo LIU1,Rongfu WEN1,Kai CHEN2,Xuehu MA1()   

  1. 1.Liaoning Key Laboratory of Clean Utilization of Chemical Resource, Institute of Chemical Engineering, Dalian University of Technology, Dalian 116024, Liaoning, China
    2.Wuhan Second Ship Design and Research Institute, Wuhan 430205, Hubei, China
  • Received:2021-04-14 Revised:2021-05-27 Online:2021-09-05 Published:2021-09-05
  • Contact: Xuehu MA

异形仿生换热器壳侧对流换热的高效低阻特性研究

刘辰玥1(),郑通1,刘渊博1,温荣福1,陈凯2,马学虎1()   

  1. 1.辽宁省化工资源清洁利用重点实验室,大连理工大学化学工程研究所,辽宁 大连 116024
    2.武汉第二船舶设计研究所,湖北 武汉 430205
  • 通讯作者: 马学虎
  • 作者简介:刘辰玥(1995—),女,硕士研究生,407781719@qq.com

Abstract:

Developing a high efficiency and low resistance performance heat exchanger is an important way to improve the energy conversion efficiency of the power system, which is of great significance for marine engineering such as shipping industry and offshore oil platform, as well as oil drilling platform and other fields. Inspired by shark gill slit structure, a special-shaped heat exchanger with bionic structures (SSBHX) is designed in this work to greatly release the space and improve the integration of the heat exchanger. By adding four different types of baffles on the shell side of the heat exchanger and introducing “clearance flow” at the inlet, the distribution of flow field, pressure field and temperature field on the shell side of the heat exchanger and the performance difference of the heat exchanger are investigated under various Reynolds numbers between 10000 to 50000 by numerical simulation. The results show that the shell side pressure drop of ladder baffle special-shaped heat exchanger with bionic structures (SSBHX-LA) is about 82% and 65% lower than that of segmental baffle special-shaped heat exchanger with bionic structures (SSBHX-SG), staggered baffle and inlet clearance staggered baffle special-shaped heat exchanger with bionic structures (SSBHX-ST and SSBHX-CST) when the velocity is 0.5 m/s. As the Reynolds number between 15000 and 35000 (0.63—1.46 m/s), the high efficiency and low resistance performance of SSBHX-CST has obvious advantages, which is about 12% higher than that of SSBHX-SG; when the Reynolds number is more than 35000 (v>1.46 m/s), the overall performance of SSBHX-LA is about 5% higher than that of SSBHX-SG, which can be applied to the application environment with higher pressure drop requirements on the shell side. The comprehensive performance evaluation diagrams of heat exchangers under different working conditions are given to provide guidance for practical application and design analysis.

Key words: special-shaped heat exchanger, bionic structure, high efficiency and low resistance, baffle, ladder baffle, heat transfer, numerical simulation, optimal design

摘要:

开发高效低阻换热器是提升系统能量转化效率的重要途径,对于船舶航运工业和海上石油平台等海洋工程以及石油钻井平台等领域具有重要的意义。受鲨鱼鳃裂结构启发,设计了一种适用于受限空间内的异形仿生换热器,大幅释放空间,并提高了换热器的集成性。通过在换热器壳程添加四种不同形式的折流板,并在进口端引入“间隙流”,模拟分析了换热器壳侧流场、压力场和温度场的分布规律,并对比了不同Reynolds数下换热器的性能差异。结果表明,阶梯式隔板换热器可达到低阻特性,流速为0.5 m/s时,壳程压降相比于弓形折流板换热器和交错类折流板换热器分别下降了约82%和65%;当Reynolds数在15000~35000之间(流速约为0.63~1.46 m/s)时,进口间隙交错折流板换热器的高效低阻特性优势明显,比弓形折流板换热器提升了约12%;当Reynolds数大于35000即流速高于1.46 m/s时,阶梯式隔板换热器的综合性能比弓形折流板换热器高出约5%,可适用于对壳程压降要求更高的应用环境。给出了不同工况下的换热器综合性能评价图,为实际应用和设计分析提供指导。

关键词: 异形换热器, 仿生结构, 高效低阻, 折流板, 阶梯式隔板, 传热, 数值模拟, 优化设计

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