中文摘要：

在定容燃烧装置上，研究了非均匀电场对不同过量空气系数的条件下球形火焰特性的影响．结果表明，在非均匀电场作用下，各过量空气系数对应的火焰形状均发生了显著变化，水平方向火焰被拉伸，竖直方向火焰变形较小；当过量空气系数为0．8、1．0、1．2和1．4时，火焰横向传播速率均增加，横向平均传播速率分别提高23％、21％、50％和49％；特别当过量空气系数为1．2和1．4时，燃烧初期压力升高率增大，最大压力分别提高2．8％和7．4％，压力峰值出现时刻分别提前15．4％和26．8％．

英文摘要：

In the constant volume combustion device, the effect of non-uniform electric field on the spherical flame characteristics at different excess air ratios was experimentally investigated. The results show that, with the influence of non-uniform electric field, flame shapes corresponding to various excess air ratios all change significantly, and flames are stretched in the horizontal direction but deformed slightly in the vertical direction. When the excess air ratio is 0.8, 1.0, 1.2 and 1.4, the horizontal flame propagation speeds all increase, and the average propagation speeds in the horizontal direction increase by 23%, 21%, 50% and 49%, respectively. In addition, when the excess air ratio is 1.2 and 1.4, the rates of pressure rise increase at the initial stage of burning, the maximum pressures increase by 2.8% and 7.4%, and the peak pressure appearing time advances by 15.4% and 26.8%, respectively.