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汽车安全与节能学报

JASE ›› 2016, Vol. 07 ›› Issue (01): 72-77.DOI: 10.3969/j.issn.1674-8484.2016.01.009

• 汽车节能与环保 • 上一篇    下一篇

交直流电场对甲烷/ 空气火焰燃烧特性影响的试验与分析

吴筱敏，侯俊才，张 聪，崔雨辰，段 浩，李 超   

  1. 西安交通大学 能源与动力工程学院，710049 西安，中国
  • 收稿日期:2015-09-25 出版日期:2016-03-25 发布日期:2016-04-05
  • 作者简介:第一作者 / First author ： 吴筱敏(1957—)，女( 汉)，陕西，教授, 博士生导师。E-mail: xmwu@mail.xjtu.edu.cn 第二作者 / Second author ： 侯俊才(1991—)，男( 汉)，山西，硕士研究生。E-mail: houjuncai@stu.xjtu.edu.cn
  • 基金资助:

    国家自然科学基金资助项目(51176150,51476126)；汽车安全与节能国家重点实验室开放基金资助项目(KF14122）

Experimental study of effects of DC/AC electric fields on the combustion characteristic of CH4/O2/N2 flames

WU Xiaomin, HOU Juncai, ZHANG Cong, CUI Yunchen, DUAN Hao, LI Chao   

  1. School of Energy and Power Engineering, Xi’an Jiaotong University, Xi’an 710049, China
  • Received:2015-09-25 Online:2016-03-25 Published:2016-04-05

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摘要：

为了提高天然气燃烧速度，促进火焰传播，提高火焰稳定性，研究了稀燃条件下电场对层流
预混火焰的影响。进行了常温、常压下的定容燃烧弹试验，分析了负电场和高频交流电场对天然气/
空气预混稀燃火焰形状、燃烧压力、压力升高率、火焰燃烧期的影响。结果表明：过量空气系数1.6
下，加载交直流电场均使火焰发生形变；当加载直流－ 5 kV 电场与有效值为5 kV频率5、10、15 和
25 kHz 交流电场时，燃烧压力峰值分别增大6.96%、8.84%、10.50%、13.78%、14.40%，峰值到达
时间提前14.67%、13.58%、18.93%、25.41%、27.97%；加载交直流电场，主要使火焰初始燃烧期
缩短。交直流电场对火焰均有促进作用，且高频交流电场对火焰的促进作用优于直流电场。

关键词: 替代燃料汽车, 天然气, 稀燃, 燃烧压力, 火焰燃烧期, 负电场, 高频交流电场

Abstract:

The effects of electric fields on the natural gas laminar premixed flame were investigated under
lean combustion condition to promote the flame propagation and improve the flame combustion speed and
stability. Experiments were conducted in a constant volume combustion bomb under the room temperature
and atmospheric pressure conditions to analyze the effects of DC and AC electric fields on the flame shape,
combustion pressure, the pressure rise rate, and flame combustion duration. The results show that the peak
combustion pressure increased by 6.96%, 8.84%, 10.50%, 13.78%, and 14.40% and peak pressure arrival time
were shortened by 14.67%, 13.58%, 18.93%, 25.41%, and 27.97% when the DC electric fields of -5 kV and
AC electric fields with the voltage virtual value of -5 kV and frequencies of 5, 10, 15, and 25 kHz were applied
at the excess air ratio of 1.6, the flame was stretched with the applied voltage. Initial duration was shortened
significantly with the applied voltage. Therefore, AC and DC electric field have a promoting effect on the flame,
and the high frequency AC electric fields for the promotion of flame are better than that of DC electric fields.
These results will be helpful to the theory research of alternative fuel vehicles engine combustion process.

Key words: alternative fuel vehicles, natural gas, lean combustion, combustion pressure, flame combustion duration, negative DC electric fields, high-frequency AC electric fields