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中南大学学报(自然科学版)

Journal of Central South University

第48卷    第11期    总第279期    2017年11月

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文章编号:1672-7207(2017)11-2926-09
钝体阶梯扩管型微燃烧器内氢气-空气燃烧特性及协同性分析
左青松1,朱鑫宁1,张建平1,王志奇1,张彬2

(1. 湘潭大学 机械工程学院,湖南 湘潭,411105; 2. 湖南大学 机械与运载工程学院,湖南 长沙,410082)

摘 要: 为提高微燃烧器燃烧稳定性和燃烧效率,基于钝体直管和钝体阶梯扩管燃烧器进行微尺度燃烧数值模拟分析研究。研究结果表明:在钝体微燃烧器中加入阶梯扩管结构有助于促进火焰传播和扩大火焰稳定燃烧极限,而且两者的吹熄极限均随当量比(即完全燃烧所需的理论空气质量与实际供给的空气质量之比)的增大而增大;燃烧器的燃烧效率均随当量比和入口混合气速度的增大而降低,而且钝体直管型燃烧器的燃烧效率要比扩管型燃烧器低;散热损失比均随当量比增大呈先增大后降低,随入口速度增大而降低;钝体直管燃烧器协同数高于钝体阶梯扩管,两者的协同数都随入口的混合气速度增大先增大后降低再增大。

 

关键词: 微燃烧器;钝体;阶梯扩管;吹熄极限;热扩散率;协同数

Premixed hydrogen/air combustion characteristics and field synergy in micro combustor with bluff body and backward-facing step
ZUO Qingsong1, ZHU Xinning1, ZHANG Jianping1, WANG Zhiqi1, ZHANG Bin2

1. College of Mechanical Engineering, Xiangtan University, Xiangtan 411105, China; 2. College of Mechanical and Vehicle Engineering, Hunan University, Changsha 410082, China

Abstract:In order to improve combustion stability and combustion efficiency, micro-combustor mathematical simulation was studied based on bluff body and backward-facing step combuster. The results show that the backward-facing step in combustion chamber can increase the flame propagation speed and expand the blow-off limits of flame, and both increases with the increase of the equivalence ratio (that is, the ratio of the theoretical air mass of complete combustion to the actually air mass). Furthermore, the combustion efficiency of combustors increases firstly and then decreases with the continual increase of inlet velocity or equivalence ratio, and combustion efficiency of combustor with backward-facing step is higher than that of without step under the same conditions. While the heat dissipation ratio of the two types of micro combustors increases with the decrease of inlet velocity, and it increases firstly and then decreases with the increase of equivalence ratio. With the increase of inlet mixed gas velocity, field synergy numbers of the micro combustor with and without the backward-facing step increase firstly and then decrease, but increase again.

 

Key words: micro-combustors; bluff body; backward-facing step; blow-off limit; heat dissipation ratio; field synergy number

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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