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燃烧强化是介质阻挡放电的一种新应用,是加速燃烧的化学动力学过程,从而提高燃料的点火性能、燃烧速度和稳定性等燃烧特性的一种新技术。为此,利用一种同轴介质阻挡放电结构对甲烷进行放电,然后将处理后的甲烷与空气混合、燃烧,研究放电对火焰形态的影响。实验现象表明经处理后燃料的燃烧火焰的整体位置向下移动,出现回火现象,通常认为这是由火焰的燃烧传播速度增加所引起的。但该文认为这种回火现象是由介质阻挡放电电极的边缘电场效应所引起的。边缘电场加速燃料等离子体与空气的混合过程,并最终引起回火。该文采用添加绝缘导管的方法考察边缘电场对燃料气体混合过程的影响,证实了带电粒子在边缘电场的作用下会改善燃料气体的混合过程。
Combustion enhancement is a new application of dielectric barrier discharge. It is a new technology that accelerates the chemical kinetics of combustion and improves the combustion characteristics of the fuel, such as the ignition performance, combustion speed and stability. To this end, a coaxial dielectric barrier discharge structure was used to discharge methane. The treated methane was then mixed with air and burned to study the effect of discharge on flame morphology. The experimental results show that the overall position of the combustion flame of the treated fuel moves downwards and tempering appears, which is generally considered to be caused by the increase of flame propagation velocity. However, this paper argues that this tempering phenomenon is caused by the electric field effect at the edge of the dielectric barrier discharge electrode. The fringing electric field accelerates the mixing of the fuel plasma with the air and eventually causes tempering. In this paper, the influence of fringing electric field on the process of fuel gas mixing is investigated by adding insulated conduits. It is verified that the charged particles can improve the mixing process of fuel gas under the action of fringing electric field.