西安交通大学动力工程多相流国家重点实验室,西安,710049
网络首发:2014-07-10,
纸质出版:2014
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卫之龙, 王金华, 舒新建, 等. 合成气预混层流火焰结构的实验和数值研究[J]. 西安交通大学学报, 2014,48(7):34-40.
Experimental and Numerical Study on Structure of Laminar Premixed Syngas-Air-Diluents Flames[J]. 2014, 48(7): 34-40.
卫之龙, 王金华, 舒新建, 等. 合成气预混层流火焰结构的实验和数值研究[J]. 西安交通大学学报, 2014,48(7):34-40. DOI: 10.7652/xjtuxb201407007.
Experimental and Numerical Study on Structure of Laminar Premixed Syngas-Air-Diluents Flames[J]. 2014, 48(7): 34-40. DOI: 10.7652/xjtuxb201407007.
利用OH-PLIF方法获得了当量比分别为0.6、0.8、1.0、1.2
CO
2
或N
2
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
2
和CO
2
稀释的影响
混合气层流燃烧速度降低
火焰前锋面拉长
CO
2
对火焰结构的影响比N
2
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。
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
2
/CO
2
)
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
an
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
2
and CO
2
the laminar burning velocity decreases
leading to the extension of the flame front
and CO
2
has a greater impact on the flame structure compared to N
2
; 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.
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