中文摘要：

通过改变过量空气系数和加载电压,研究了点电极产生的正电场对甲烷-空气预混火焰形状、传播速率以及燃烧压力的影响.结果表明：在电场作用下,离子风效应促进火焰的传播,使火焰沿水平方向被拉伸,并且火焰传播速率增加.当外加电压为12kV时,过量空气系数为0.8、1.0和1.2下的火焰传播速率最大值分别增加了55.7％、13.2％和46.6％;过量空气系数为1.4时,离子风效应和电晕放电的共同作用促使传播速率曲线出现转点,转点后的传播速率最大值增加达到128.9％.电场作用下,燃烧压力峰值有所增加,并且过量空气系数为1.2和1.4时压力峰值出现时刻最大分别提前了14.1％和16.6％.

英文摘要：

An experiment was conducted to study the effect of positive electric fields of point electrodes on the shape, propagation speed and the combustion pressure of premixed methane/air flames by altering the excess air ratio and the applied voltage. The results showed that the effect of ionic wind promoted the flame propagation, and made flames stretched in the horizontal direction with the propagation speed being increased. When the applied voltage was 12 kV,the maximum of propagation speed was increased by 55.7% ,13.2% and 46.6% at the excess air ratio of 0.8,1.0 and 1.2, respectively. When the excess air ratio was 1.4, a turning point appeared because of the com- bination effect of ionic wind and corona discharge. The maximum of propagation speed was increased by 128.9% af- ter the turning point. Under the influence of electric fields, the value of peak pressure was increased and the time of peak pressure was advanced by 14.1% and 16.6% when the excess air ratio was 1.2 and 1.4 ,respectively.