Mechanism Analysis of the Effect of Positive DC Electric Field on Spherical Flame

doi:10.7652/xjtuxb201807010

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Mechanism Analysis of the Effect of Positive DC Electric Field on Spherical Flame

更新时间：2025-07-09

- Mechanism Analysis of the Effect of Positive DC Electric Field on Spherical Flame
- Vol. 52, Issue 7, Pages: 68-73(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/xjtuxb201807010
  CLC： TK431
- Online First：10 July 2018，
  
  Published：2018
- 稿件说明：
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Mechanism Analysis of the Effect of Positive DC Electric Field on Spherical Flame[J]. 2018, 52(7): 68-73.
DOI：

Mechanism Analysis of the Effect of Positive DC Electric Field on Spherical Flame[J]. 2018, 52(7): 68-73. DOI： 10.7652/xjtuxb201807010.

摘要

为了确定正直流电场影响燃烧的机理

选取了初始压力为303.975 kPa

过量空气系数为1.2、1.4、1.6的预混稀燃气

通过对容弹内网状电极分别加载幅值为5 kV的正/负直流电压以及幅值为5 kV、频率为15 kHz的高频交流电压

对比分析了直流正电场与另外两种电场下预混球形火焰传播特性的异同。结果显示:不论火焰形变、火焰传播中速度的变化还是平均传播速度增大率随过量空气系数的变化

其在正直流电场下的规律都与负直流电场下相近而与高频交流电场下相差甚远; 当过量空气系数从1.2增大至1.6时

正/负直流电场下火焰平均传播速度增大率从低于15%提高至约40%

而交流电场下该值始终约为11%。对比结果表明

正直流电场与负直流电场一样主要通过离子风效应影响火焰

但分析表明正电场下离子风的形成机理及促进效果与负电场下差异明显

这对不同条件下采用电场辅助燃烧时的电场种类选择有重要意义。

Abstract

To investigate the affecting mechanism of positive DC electric field on the combustion

the premixed lean fuel gas with an initial pressure of 303.975 kPa and excess air coefficient of 1.2

1.4

1.6 was selected as the research object

and positive/negative DC voltage of 5 kV and high frequency AC voltage of 5 kV

15 kHz were applied on the mesh electrodes within the combustion bomb. The flame's propagating characteristics under three electric fields were analyzed. The results showed that the change rules of the flame deformation

the flame propagation speed and the increase rate of the average propagation speed with the excess air coefficient under positive DC electric field are similar to those under negative DC electric field but different from those under high-frequency AC electric field. When the excess air coefficient increased from 1.2 to 1.6

the increase rate of average propagation speed under DC electric field increased from less than 15% to about 40%

while this value is always around 11% under AC electric field. It can be confirmed that both negative and positive DC electric fields affect the flame mainly through the ionic wind effect

but the formation mechanism and promotion effect of ionic wind between two electric fields are significantly different

which is of great significance for the choice of electric field type to assist combustion under different conditions.

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references

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