Experimental and Numerical Study on Structure of Laminar Premixed Syngas-Air-Diluents Flames

doi:10.7652/xjtuxb201407007

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Experimental and Numerical Study on Structure of Laminar Premixed Syngas-Air-Diluents Flames

更新时间：2025-07-09

- Experimental and Numerical Study on Structure of Laminar Premixed Syngas-Air-Diluents Flames
- Vol. 48, Issue 7, Pages: 34-40(2014)
- 作者机构：
  
  西安交通大学动力工程多相流国家重点实验室,西安,710049
- 作者简介：
- 基金信息：
- DOI：10.7652/xjtuxb201407007
  CLC： TK411
- Online First：10 July 2014，
  
  Published：2014
- 稿件说明：
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Experimental and Numerical Study on Structure of Laminar Premixed Syngas-Air-Diluents Flames[J]. 2014, 48(7): 34-40.
DOI：

Experimental and Numerical Study on Structure of Laminar Premixed Syngas-Air-Diluents Flames[J]. 2014, 48(7): 34-40. DOI： 10.7652/xjtuxb201407007.

摘要

利用OH-PLIF方法获得了当量比分别为0.6、0.8、1.0、1.2

或N

稀释比分别为3%、5%时

合成气/空气/稀释气本生灯预混层流火焰中OH基的分布

结合STAR-CD模拟计算所得火焰中的流场和组分分布进一步分析了火焰结构。研究结果表明:随着混合气当量比的增加

OH基高浓度分布区域由火焰前锋面附近转移到火焰边缘; 混合气较稀时

火焰前锋面附近OH基浓度最高且沿已燃区方向逐步递减

火焰顶端处OH基浓度减小

模拟计算结果显示火焰顶端并未发生燃料泄漏; 化学当量比下

火焰前锋面附近和火焰边缘区域OH基浓度较高

火焰前锋面附近出现了预混燃烧区和扩散燃烧区

该区域中OH基呈现“W”型分布; 受N

和CO

稀释的影响

混合气层流燃烧速度降低

火焰前锋面拉长

对火焰结构的影响比N

更显著; 火焰前锋面附近OH基浓度减小

扩散燃烧区OH基浓度增大

说明火焰的预混燃烧有所减弱

扩散燃烧有所加强。

Abstract

The structures of laminar premixed syngas-air-diluents flames were obtained at different equivalence ratios(0.6

0.8

1.0

1.2)

diluents(N

/CO

)

and dilution ratios(3% and 5%)by using OH-PLIF technique. Flame structure was analyzed on the basis of the flow field and species distribution which were calculated with STAR-CD. The results show that high OH distribution shifts towards the outer flame boundary with the increase of equivalence ratio; for lean mixture

the region of high OH radical concentration locates along the conic primary reaction boundary; OH radical concentration at the flame cone tip decreases

d the numerical simulation results show that no leakage occurs at the flame tip; for mixture at stoichiometric ratio

high OH radical concentration appears along the flame front and on the flame surface

meaning the occurrence of a premixed combustion zone and a diffusion combustion zone

and the OH distribution appears to resemble a “W” shape; due to the effects of diluents N

and CO

the laminar burning velocity decreases

leading to the extension of the flame front

and CO

has a greater impact on the flame structure compared to N

; OH radical concentration decreases along the flame front while increases in the diffusion zone

which means the premixed combustion is weakened while the diffusion combustion is intensified.

关键词

Keywords

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