关键词: 初始压力, 甲烷, 空气, 直流电场, 定容燃烧弹, 火焰传播速率, 燃烧压力

Abstract:

The effect of DC electric field on methane/air premixed flame was studied under the room temperature (298 K) and initial pressure P_initial of 0.1-0.5 MPa. The results are as follows. The flame is mainly stretched in the horizontal direction with the applied voltage under different initial pressures. The change of the flame deformation increases with the voltage amplitude. The flame instability increases with the initial pressure. Compared to without the applied voltage, the flame propagation speed is improved obviously with the applied voltage, and the enhancement in flame propagation speed increases with the voltage amplitude and initial pressure, so the effect of the electric fields on the flame increases with the initial pressure. When λ=1.4,U=-10 kV,and P_initial=0.1-0.5 MPa, the average flame propagation speed increases by 35.67%-52.71%. The enhancement in the mass burning rate increases with the voltage amplitude and the initial pressure with the applied voltage. The initial burning period and the main combustion period are shortened with the applied voltage, and the decrease in them increase with the initial pressure, and the change of the initial burning period is more obvious.

Key words: initial pressure, methane, air, direct current electric field, constant volume combustion bomb, flame propagation speed, combustion pressure