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本文研究了常温常压不同过量空气系数下定容燃烧弹中对点电极加载不同电压时甲烷一空气预混燃烧火焰的传播与燃烧特性。结果表明:点电极加载电压后使得火焰传播速度变快,压力峰值变大,峰值到达时间缩短。混合气φa=0.8、1.0、1.2在加载电压为-5 kV时,火焰横向传播速度分别比未加电压时增加12.6%、2.3%、9.7%,压力峰值到达时间分别比未加电压时缩短5.9、0.3、5.1 ms;加载电压为-10 kV时,火焰横向传播速度分别比未加电压时增加22.2%、9.6%、24.4%,压力峰值到达时间分别比未加电压时缩短9.9、3.7、11.8 ms。
In this paper, the propagation and combustion characteristics of a methane-air premixed combustion flame at constant voltage and pressure with different excess air ratio are studied. The results show that after the voltage is applied at the point electrode, the propagation velocity of the flame is increased, the pressure peak value is increased, and the peak arrival time is shortened. The mixed gas φa = 0.8,1.0,1.2 at the applied voltage of -5 kV, the transverse flame propagation velocity increased 12.6%, 2.3% and 9.7% respectively when the voltage was not applied, and the peak pressure arrival time was 5.9 , 0.3 and 5.1 ms, respectively. When the applied voltage was -10 kV, the flame propagation velocity increased by 22.2%, 9.6% and 24.4% respectively compared with that without voltage, and the peak pressure arrival time shortened by 9.9, 3.7 and 11.8 ms.