Study on the Combustion Characteristics and Stabilization Mechanism of Low Swirl CH<sub>4</sub>/H<sub>2</sub> Flame

doi:10.7652/xjtuxb201701012

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Study on the Combustion Characteristics and Stabilization Mechanism of Low Swirl CH₄/H₂ Flame

更新时间：2025-07-09

- Study on the Combustion Characteristics and Stabilization Mechanism of Low Swirl CH₄/H₂ Flame
- Vol. 51, Issue 1, Pages: 72-78(2017)
- 作者机构：
  
  西安交通大学能源与动力工程学院,西安,710049
- 作者简介：
- 基金信息：
- DOI：10.7652/xjtuxb201701012
  CLC： TK47
- Online First：10 January 2017，
  
  Published：2017
- 稿件说明：
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Study on the Combustion Characteristics and Stabilization Mechanism of Low Swirl CH₄/H₂ Flame[J]. 2017, 51(1): 72-78. DOI: 10.7652/xjtuxb201701012.
DOI：

Study on the Combustion Characteristics and Stabilization Mechanism of Low Swirl CH₄/H₂ Flame[J]. 2017, 51(1): 72-78. DOI: 10.7652/xjtuxb201701012. DOI：

摘要

为了研究低旋流CH

火焰在不同H

占比(体积分数)条件下的燃烧特性及稳定机制

对当量比为0.7的CH

预混气体进行了数值模拟

分析了CH

火焰的自相似特性、流场结构及火焰特性

研究了旋流数对富氢燃料回火性的影响。结果表明:随H

占比增加

火焰仍保持自相似特性

其剪切层强度逐渐增加

内剪切层逐渐向中心低速区移动

火焰锋面逐渐向喷嘴移动

火焰形状由“碗”型逐渐变为“W”型

最后变为“V”型

而轴向、径向速度延伸率以及虚拟原点几乎不受H

占比影响。在H

占比从80%增加到95%时

燃料的层流火焰速度变化较大

使得流场结构和火焰锋面位置发生剧烈变化。对于中心低速区的CH

火焰

当火焰传播速度等于当地气流速度时

火焰稳定; 对于内剪切层区的CH

火焰

速度梯度产生的旋流使得当地气流产生向下和向中心低速区移动的趋势

从而火焰产生向上移动的趋势

实现火焰稳定。适当减小旋流数

有利于减小富氢燃料回火发生的可能性。

Abstract

The numerical simulation on the premixed CH

gas at an equivalence ratio of 0.7 was conducted to investigate the combustion characteristics and stabilization mechanism of low swirl CH

flame in various hydrogen volume proportions. The analyses on the self-similar characteristics

the flow field structure and the flame characteristics of CH

flame were performed

and the effect of swirl

number on the flashback of hydrogen-enriched fuel was studied. The results showed that with the increase of H

volume proportion

the self-similar characteristics of CH

flame still remain; the intensity of the shear layer increases gradually and the inner shear layer moves gradually to the central low-velocity zone

which compels the flame front towards the nozzle

and the shape of the flame changes from the “bowl” type to “W” type

and then converts to “V” type finally. The mean axial and radial aerodynamic stretch rates and the virtual origin are almost not affected by the hydrogen volume proportion. When the hydrogen volume proportion increases from 80% to 95%

the laminar flame speed of the fuel changes greatly

leading to drastic changes in the flow field structure and the flame front. As for the CH

flame in the central low-velocity zone

when the flame propagation velocity is equal to the local gas velocity

the flame is stable; as for the CH

flame in the shear layer

the vortex produced by the velocity gradient facilitates the local gas flowing downward and moving toward the central low-velocity zone

thus the flame moves upward and reaches a stable state. Decreasing the swirl number properly is beneficial to the reduction of the flashback of hydrogen-enriched fuel.

关键词

Keywords

references

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Study on the Combustion Characteristics and Stabilization Mechanism of Low Swirl CH4/H2 Flame

DOI：10.7652/xjtuxb201701012

摘要

Abstract

关键词

Keywords

references

Study on the Combustion Characteristics and Stabilization Mechanism of Low Swirl CH₄/H₂ Flame