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汽车安全与节能学报

JASE ›› 2016, Vol. 07 ›› Issue (01): 78-85.DOI: 110.3969/j.issn.1674-8484.2016.01.010

• 汽车节能与环保 • 上一篇    下一篇

直交流电场对甲烷—空气预混球形扩展火焰的影响

李超1，张聪1，侯俊才1，吴筱敏1,2   

  1. 1. 西安交通大学 能源与动力工程学院，西安710049，中国； 2. 陕西科技大学，汉中723001，中国
  • 收稿日期:2015-09-21 出版日期:2016-03-25 发布日期:2016-04-05
  • 通讯作者: 吴筱敏，教授。E-mail: xmwu@mail.xjtu.edu.cn
  • 作者简介:李 超（1987 －），男（汉），陕西，博士研究生。E-mail: wzer1987@stu.xjtu.edu.cn
  • 基金资助:

    国家自然科学基金资助项目（51176150,51476126）；
    国家重点实验室清华大学汽车安全与节能开放基金资助项目(KF14122)

Effect of DC/AC electric field acting on premixed methane-air spherically expanding flame

LI Chao 1, ZHANG Cong 1, HOU Juncai 1, WU Xiaomin 1,2   

  1. 1. Xi'an JiaoTong University School of energy and power engineering, Xi'an 710049, China
    2. Shaanxi University of Science and Technology, Hanzhong 723001, China
  • Received:2015-09-21 Online:2016-03-25 Published:2016-04-05

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摘要：

为验证直流/ 交流电场对甲烷—空气预混球形传播火焰的助燃机理，模拟研究了火焰分别受
气动效应、热效应和两者叠加作用的影响。采用的模拟方法是：向火焰锋面Navier-Stokes (N-S) 方
程添加动量源项和能量源项。进行了相关的实验，以验证模拟的正确性。结果表明：直流电场对火焰
的影响主要是气动效应，火焰锋面内粒子的迁移和涡流是其中的主要因素。在1 kHz 以下的低频交流
电场中，电场对火焰的影响主要是气动效应和热效应的叠加作用。而在1 kHz 以上的高频交流电场中，
因该频率远高于粒子响应所需，故不存在气动效应，此时电场对火焰的影响是由热效应产生的。

关键词: 电场助燃, 火焰拉伸, 气动效应, 热效应, 数值模拟

Abstract:

Aerodynamic effect, thermal effect and combination effects on flame were investigated by numerical
simulation to verify the combustion assisted mechanism of DC/AC electric field acting on the premixed methaneair
spherically expanding flame. The simulation method was adding momentum source and energy source
terms into the Navier-Stokes (N-S) equations on flame surface. Some relative experiments were done to verify
the simulation correctness. The results show that the aerodynamic effect including the particle motion on flame
surface and the vortexes, are the main factor that affect the flame under DC electric field. The flame is affected
by the superposition of aerodynamic effect and the thermal effect under an AC electric field below 1 kHz. The
flame is only affected by the thermal effect without aerodynamic effect under an AC field above 1 kHz, which is
much higher than that particle response required.

Key words: electric field assisted combustion, flame stretch, aerodynamic effect, heat effect, numerical simulation