中文摘要：

为了获得高频交流电场电压幅值对球形扩展火焰的影响因素,运用电磁学原理进行了研究,得出：以两网状电极为底面的圆柱体中任意一点在任意时刻产生的电磁能量大小与交流电电压有效值的平方成正比,与该点到圆柱体轴心的距离成正比,在圆柱体中电磁能量密度沿径向递减;电磁能量产生的热效应和电化学效应可提高火焰平均传播速度,电磁能量密度的不均分布会引起火焰变形。同时,通过对常温、常压下定容燃烧弹中3种过量空气系数的甲烷-空气预混球形扩展火焰的平均传播速度和形状变化与加载交流电压有效值的关系进行了实验验证,结果表明：当电压有效值小于2kV时,电磁能量以热效应的方式促进火焰传播,当电压有效值大于2kV时,电磁能量以电化学效应的方式促进燃烧;实验中电磁能量密度的不均匀分布导致了火焰横向拉伸。该结果可为高频电场助燃研究提供新的思路和方法。

英文摘要：

To find out the influence factors of high frequency AC electric field voltage amplitude on spherically expanding flame, the basic principles of electromagnetism are used to conclude that the value of electromagnetic energy gets proportional to the square of RMS AC voltage and the distance to the axial in the cylinder with two mesh electrodes as its bottom surfaces at any time; the electromagnetic energy density decreases radially in the cylinder~ the thermal and electrochemical effects produced by electromagnetic energy promotes the the average flame propagation rate, and the uneven distribution of electromagnetic energy density leads to a flame deformation. An experiment is conducted to investigate the relationship between RMS AC voltage and the average flame propagation rate/deformation of premixed CH~-air mixture flame at room temperature and 3 kinds of excess air ratio, under atmospheric pressure and high frequency AC electric fields. The results show that when RMS produced by electromagnetic energy promotes the AC voltage is lower than 2 kV, thermal effect average flame propagation rate, and when RMS AC voltage is higher than 2 kV, electrochemical effect promotes the average flame propagation rate, and the uneven distribution of electromagnetic energy density leads to transverse stretch of the flame.