Mechanism Analysis on the Effect of Low-Frequency AC Electric Field on CH<sub>4</sub>/Air Premixed Flame

doi:10.7652/xjtuxb201811007

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Mechanism Analysis on the Effect of Low-Frequency AC Electric Field on CH₄/Air Premixed Flame

更新时间：2025-07-09

- Mechanism Analysis on the Effect of Low-Frequency AC Electric Field on CH₄/Air Premixed Flame
- Vol. 52, Issue 11, Pages: 45-50+141(2018)
- 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/xjtuxb201811007
  CLC： TK431
- Online First：10 November 2018，
  
  Published：2018
- 稿件说明：
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Mechanism Analysis on the Effect of Low-Frequency AC Electric Field on CH₄/Air Premixed Flame[J]. 2018, 52(11): 45-50+141. DOI: 10.7652/xjtuxb201811007.
DOI：

Mechanism Analysis on the Effect of Low-Frequency AC Electric Field on CH₄/Air Premixed Flame[J]. 2018, 52(11): 45-50+141. DOI: 10.7652/xjtuxb201811007. DOI：

摘要

为了明确低频交流电场对火焰的作用机理

在常温、初始压力0.3 MPa下

施加电压有效值为5 kV、频率f=40

100 Hz的电场对甲烷/空气混合气的燃烧特性进行研究

建立了预混甲烷/空气火焰离子反应模型

对燃烧过程各粒子的浓度变化进行模拟

将实验与模拟结果综合进行了分析。结果表明:加载低频交流电场后

预混球形火焰在横向发生明显形变

随着频率的增大

平均火焰传播速度(-overS)

和压力峰值P

max

均逐渐减小; 模拟计算表明随着频率的增大

双离子风发展程度ξ

eff

逐渐减小

平均火焰传播速度增大率Δ(-overS)

和压力峰值增大率ΔP

max

与双离子风发展程度ξ

eff

的线性拟合相关系数分别为0.995 82和0.919 96

eff

与电场对火焰的促进作用密切相关; 电场下火焰前锋面粒子间的碰撞作用程度与火焰的宏观拉伸形变之间存在着直接联系

基于碰撞作用的双离子风效应是低频交流电场对预混火焰的主要促进因素。

Abstract

The alternating electric field can promote flame combustion

and research shows that the promotion effect of low-frequency AC electric field on premixed flame is mainly based on the collision between particles in the flame. In order to further explore the effect mechanism of the particles in the flame under electric field

premixed methane/air flame ionization model was established to obtain the concentration distribution of the particles in the combustion process and calculate the developing degree of bi-ionic wind. Simulation results were compared with the experimental data. The results showed tha

t the spherically flame was horizontally stretched obviously when low-frequency AC field was applied. As the frequency increases

the average flame propagation velocity (-overS)

and pressure peak P

max

decrease gradually. Simulation results also showed that the developing degree of bi-ionic wind ξ

eff

decreases with the frequency

and the correlation coefficients of linear fitting of the average flame propagation velocity Δ(-overS)

and the pressure peak increase rate ΔP

max

with the developing degree of bi-ionic wind ξ

eff

are 0.995 82 and 0.919 96

respectively. The parameter ξ

eff

is closely related to the promotion of flame by the electric field. There is a direct relationship between the collisions of particles in the flame front and the macroscopic stretch of the flame under the applied electric field. The bi-ionic wind effect based on the particles collision is the primary promotion of the low-frequency AC electric field on the premixed flame.

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references

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Related Institution

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Mechanism Analysis on the Effect of Low-Frequency AC Electric Field on CH4/Air Premixed Flame

DOI：10.7652/xjtuxb201811007

摘要

Abstract

关键词

Keywords

references

Mechanism Analysis on the Effect of Low-Frequency AC Electric Field on CH₄/Air Premixed Flame