工程科学学报，第38卷，第8期：1182-1189,2016年8月 Chinese Journal of Engineering,Vol.38,No.8:1182-1189,August 2016 D0l:10.13374/j.issn2095-9389.2016.08.019:http://journals..ustb.edu.cn 基于CFD双P型辐射管扁形度的影响特性 冯俊小12)，陈艳梅”，刘兴杰)四，吴启明》 1)北京科技大学机械工程学院，北京1000832)北京科技大学北京高校节能与环保工程研究中心，北京100083 3)北京京诚风凰工业炉工程技术有限公司，北京100176 ☒通信作者，E-mail:liuxingjiesdut@163.com 摘要为改善辐射管热效率，本文设计了一个扁双P型辐射管，选取辐射管中心管截面长半轴A与短半轴B的比例为 1.0、1.1、1.2、1.3和1.4五种扁形度，借助于FLUENT软件就扁形度对辐射管传热性能的影响进行研究.结果表明：在保持双 P型辐射管换热表面积不变的情况下，随着双P型辐射管扁形度的增加，辐射管对带钢的辐射角系数增大，辐射管对炉内辐 射换热量增加，辐射管热效率升高：但是，随着双P型辐射管扁形度的增加，辐射管表面温差逐渐增大，扁形度达到1.3后，表 面温度不均匀系数显著增加.综合考虑辐射管的表面温差和辐射热效率，扁形度为1.2的扁双P型辐射管性能较优，与扁形 度为1.0时（即辐射管未被压扁的时候）相比，表面温度均匀性几乎不变，而辐射管热效率提高约1%， 关键词辐射管；扁形度：表面温度：热效率：计算流体力学(CFD) 分类号TK175 Influence characteristics of the degree of flattening on the performance of double-P type radiant tubes studied by CFD simulation FENG Jun-xiao),CHEN Yan-mei,LIU Xingjie,WU Qi-ming) 1)School of Mechanical Engineering,University of Science and Technology Beijing,Beijing 100083,China 2)Beijing Engineering Research Center for Energy Saving and Environmental Protection,University of Science and Technology Beijing,Beijing 100083. China 3)CERI Phoenix Industrial Furnace Co.Ltd.,Beijing 100176,China Corresponding author,E-mail:liuxingjiesdut@163.com ABSTRACT In order to improve the thermal efficiency of radiant tubes,a flat double-P type radiant tube was designed,and five major axis-to-minor axis ratios of 1.0,1.1,1.2,1.3 and 1.4 on the cross section of the center pipe were taken for numerical simula- tion to investigate the influence characteristics of the degree of flattening on the performance of the radiant tube by using the commercial software FLUENT.It is found that in the case of keeping the heat transfer surface area of the radiant tube invariable,when the degree of flattening increases,the radiant angle factor for the radiant tube and strip steel gradually grows,the radiant heat flow improves,and then thermal efficiency of the radiant tube rises.However,with an increase in the degree of flattening,the surface temperature differ- ence of the radiant tube gradually increases,and the surface temperature uniformity significantly deteriorates after the degree of flatten- ing reaches 1.3.In consideration of the thermal efficiency and surface temperature uniformity of the radiant tube,the better degree of flattening is 1.2.At this degree of flattening the radiation heat efficiency of the radiant tube increases by about 1%compared with that at the degree of flattening of 1.0,while the surface temperature uniformity is almost the same. KEY WORDS radiant tubes:degree of flattening:surface temperature:thermal efficiency:computational fluid dynamics (CFD) 辐射管应用于热处理的各种加热炉内，燃烧气氛 及产物不与被加热物体接触，并且可以控制热处理炉 收稿日期：2015-102 基金项目：“十二五”国家科技支撑计划资助项目(2011BAE13B09)工程科学学报，第 38 卷，第 8 期: 1182--1189，2016 年 8 月 Chinese Journal of Engineering，Vol． 38，No． 8: 1182--1189，August 2016 DOI: 10． 13374 /j． issn2095--9389． 2016． 08． 019; http: / /journals． ustb． edu． cn 基于 CFD 双 P 型辐射管扁形度的影响特性 冯俊小1，2) ，陈艳梅1) ，刘兴杰1) ，吴启明3) 1) 北京科技大学机械工程学院，北京 100083 2) 北京科技大学北京高校节能与环保工程研究中心，北京 100083 3) 北京京诚凤凰工业炉工程技术有限公司，北京 100176  通信作者，E-mail: liuxingjiesdut@ 163． com 摘 要 为改善辐射管热效率，本文设计了一个扁双 P 型辐射管，选取辐射管中心管截面长半轴 A 与短半轴 B 的比例为 1. 0、1. 1、1. 2、1. 3 和1. 4 五种扁形度，借助于 FLUENT 软件就扁形度对辐射管传热性能的影响进行研究． 结果表明: 在保持双 P 型辐射管换热表面积不变的情况下，随着双 P 型辐射管扁形度的增加，辐射管对带钢的辐射角系数增大，辐射管对炉内辐 射换热量增加，辐射管热效率升高; 但是，随着双 P 型辐射管扁形度的增加，辐射管表面温差逐渐增大，扁形度达到 1. 3 后，表 面温度不均匀系数显著增加． 综合考虑辐射管的表面温差和辐射热效率，扁形度为 1. 2 的扁双 P 型辐射管性能较优，与扁形 度为 1. 0 时( 即辐射管未被压扁的时候) 相比，表面温度均匀性几乎不变，而辐射管热效率提高约 1% ． 关键词 辐射管; 扁形度; 表面温度; 热效率; 计算流体力学( CFD) 分类号 TK175 Influence characteristics of the degree of flattening on the performance of double-P type radiant tubes studied by CFD simulation FENG Jun-xiao1，2) ，CHEN Yan-mei1) ，LIU Xing-jie1)  ，WU Qi-ming3) 1) School of Mechanical Engineering，University of Science and Technology Beijing，Beijing 100083，China 2) Beijing Engineering Ｒesearch Center for Energy Saving and Environmental Protection，University of Science and Technology Beijing，Beijing 100083， China 3) CEＲI Phoenix Industrial Furnace Co． Ltd． ，Beijing 100176，China  Corresponding author，E-mail: liuxingjiesdut@ 163． com ABSTＲACT In order to improve the thermal efficiency of radiant tubes，a flat double-P type radiant tube was designed，and five major axis-to-minor axis ratios of 1. 0，1. 1，1. 2，1. 3 and 1. 4 on the cross section of the center pipe were taken for numerical simula￾tion to investigate the influence characteristics of the degree of flattening on the performance of the radiant tube by using the commercial software FLUENT． It is found that in the case of keeping the heat transfer surface area of the radiant tube invariable，when the degree of flattening increases，the radiant angle factor for the radiant tube and strip steel gradually grows，the radiant heat flow improves，and then thermal efficiency of the radiant tube rises． However，with an increase in the degree of flattening，the surface temperature differ￾ence of the radiant tube gradually increases，and the surface temperature uniformity significantly deteriorates after the degree of flatten￾ing reaches 1. 3． In consideration of the thermal efficiency and surface temperature uniformity of the radiant tube，the better degree of flattening is 1. 2． At this degree of flattening the radiation heat efficiency of the radiant tube increases by about 1% compared with that at the degree of flattening of 1. 0，while the surface temperature uniformity is almost the same． KEY WOＲDS radiant tubes; degree of flattening; surface temperature; thermal efficiency; computational fluid dynamics ( CFD) 收稿日期: 2015--11--02 基金项目: “十二五”国家科技支撑计划资助项目( 2011BAE13B09) 辐射管应用于热处理的各种加热炉内，燃烧气氛 及产物不与被加热物体接触，并且可以控制热处理炉