双U型管束模型换热器的流动和传热特性

doi:10.7527/S1000-6893.2015.0053

流体力学与飞行力学

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双U型管束模型换热器的流动和传热特性

刘喜岳¹, 张靖周^1,2, 李刚团³, 康涌³

1. 南京航空航天大学能源与动力学院江苏省航空动力系统重点实验室, 南京 210016;
2. 先进航空发动机协同创新中心, 北京 100191;
3. 中国燃气涡轮研究院, 成都 610500

收稿日期:2015-01-12 修回日期:2015-02-26 出版日期:2015-12-15 发布日期:2015-03-11
通讯作者: 张靖周,Tel.:025-84895909,E-mail:zhangjz@nuaa.edu.cn E-mail:zhangjz@nuaa.edu.cn
作者简介:刘喜岳,男,博士研究生。主要研究方向:燃烧传热,E-mail:liuxiyue19861213@163.com;张靖周,男,博士,教授,博士生导师。主要研究方向:强化传热、红外隐身等。Tel:025-84895909,E-mail:zhangjz@nuaa.edu.cn

Flow and heat transfer performance of double U-shaped-tubes modeled heat exchanger

LIU Xiyue¹, ZHANG Jingzhou^1,2, LI Gangtuan³, KANG Yong³

1. Jiangsu Province Key Laboratory of Aerospace Power System, College of Energy and Power Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China;
2. Collaborative Innovation Center of Advanced Aero-Engine, Beijing 100191, China;
3. China Gas Turbine Establishment, Chengdu 610500, China

Received:2015-01-12 Revised:2015-02-26 Online:2015-12-15 Published:2015-03-11

摘要/Abstract

摘要：

为了研究双U型管束模型换热器的流动和传热性能,通过低速高温风洞的模型实验和Fluent-CFD数值计算,得到了换热器的管型和安装角对换热器压降和回热效率的影响规律。结果表明:在相同的双U型管管内气流平均流动速度下,椭圆管换热器的管内流动压降高于圆管换热器的,相对增加幅度在50%~60%之间;对于外部流动,换热器安装角度增大所诱导的外部流动压降显著增加,在换热器30°的安装角下,椭圆形管束的低阻流动型面得以充分体现,其外部流动压降较圆形管束换热器可以降低约50%;随着换热器安装角的增加,换热器回热效率具有明显的提高;相对换热器安装角,换热器管型对回热效率的影响较小,集气管的进气-出气方式对双U型管束换热器的回热效率具有较显著的影响。

关键词: U型管换热器, 安装角度, 管截面形状, 压降, 回热效率

Abstract:

In order to investigate the flow and heat transfer performances of double U-shaped-tubes modeled heat exchanger, model experiments were conducted in a low-speed high-temperature wind tunnel and numerical calculations were also conducted using Fluent-CFD software. The effects of tube cross-sectional shape and heat exchanger inclined angle on the pressure drop and recuperator effectiveness were obtained. The results show that the internal pressure drop for the elliptic-tube heat exchanger is increased by about 50%-60% relative to the circular-tube heat exchanger at the same averaged flow velocity inside the U-shaped tube. For the external flow, the pressure drop is significantly increased as the increase of heat exchanger inclined angle. At inclined angle of 30°, the pressure drop outside the elliptic-tube heat exchanger is significantly lower than that of the circular-tube heat exchanger with approximately 50% decrease. As the heat exchanger inclined angle increases, the recuperator effectiveness is significantly improved. By comparison with the effect of inclined angle, the tube shape has a weak influence on the recuperator effectiveness. The internal flow entering-gathering mode has moderate effect on the recuperator effectiveness of U-shaped-tubes heat exchanger.

Key words: U-shaped-tubes heat exchanger, inclined angle, tube cross-sectional shape, pressure drop, recuperator effectiveness

中图分类号:

V231.1
O354

刘喜岳, 张靖周, 李刚团, 康涌. 双U型管束模型换热器的流动和传热特性[J]. 航空学报, 2015, 36(12): 3832-3842.

LIU Xiyue, ZHANG Jingzhou, LI Gangtuan, KANG Yong. Flow and heat transfer performance of double U-shaped-tubes modeled heat exchanger[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2015, 36(12): 3832-3842.

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E-mail：hkxb@buaa.edu.cn

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主管单位：中国科学技术协会主办单位：中国航空学会北京航空航天大学

双U型管束模型换热器的流动和传热特性

Flow and heat transfer performance of double U-shaped-tubes modeled heat exchanger

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