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中南大学学报(自然科学版)

Journal of Central South University

第41卷    第6期    总第196期    2010年12月

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文章编号:1672-7207(2010)06-2430-05
多燃料喷口夹角与火焰长度的关系
徐琼辉1,汪南1,陈宏1,漆小玲1,詹杰民2

(1. 华南理工大学 化学与化工学院 强化传热与过程节能教育部重点实验室,广东 广州,510640;
2. 中山大学 应用力学与工程系,广东 广州,510275
)

摘 要: 鉴于在多燃料喷口的甲烷-空气扩散燃烧中,喷口布局方式对火焰长度的影响较大,验证扩散燃烧火焰长度数值计算的可靠性;根据对称原理,经过反复试算,确定合理的计算区域,调整各喷口之间的夹角以及甲烷和同流空气的速度,得到不同工况下的火焰长度。研究结果表明:甲烷与同流空气流动速度相等,火焰长度随着同流空气流速增大而增大;当同流空气速度一定时,火焰长度随着甲烷流速变大先增大后减小;当喷口夹角为0º(或90º)时,火焰长度最短,当喷口夹角为30º时,火焰最长。

 

关键字: 扩散燃烧;火焰长度;喷口;夹角

Relationship between angle of spouts and flame length in
 diffusion combustion
XU Qiong-hui1, WANG Nan1, CHEN Hong1, QI Xiao-ling1, ZHAN Jie-min2

1. Key Laboratory of Enhanced Heat Transfer and Energy Conservation, Education of Ministry,
School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou 510640, China;
2. Department of Applied Mechanics and Engineering, Zhongshan University, Guangzhou 510275, China

Abstract:Based on the fact that in diffusion combustion, arrangement of spouts has an important effect on flame length, the reliability of calculated results of flame length was validated. According to principle of symmetry, a reasonable calculation region was selected, and flame length was calculated in every case by adjusting angle of spouts, velocity of methane and co-flow air. The results show that if velocity of methane and co-flow air is equivalent, flame length will be lengthened with the increase of co-flow air velocity. If co-flow air is a fixed value, flame length will be lengthened at first, then be shortened with velocity of methane; flame is the shortest at 0º (or 90º) of spout, and is the longest at 30º.

 

Key words: diffusion combustion; flame length; spouts; angle

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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