CH₄/H₂-空气预混气流动点火特性

The experimental system was designed around a tunnel combustion chamber to produce in-flow conditions in this study, and nanosecond pulsed highfrequency discharge was used to explore the ignition characteristics in flowing premixed CH₄/H₂-air. The effects of different hydrogen mixed ratios(α=0, 5%, 10%)and different pulse repetition frequencies( f=10kHz, 15kHz, 20kHz)on the ignition probability P_ig were obtained experimentally. The results show that with the same ignition energy P_ig increases rapidly as the hydrogen mixed ratio and pulse repetition frequency increase. There exists an optimal discharge power during the same discharge period, and higher or lower power is not conducive to ignition. In addition, the development of initial ignition kernel was simulated by numerical calculations to further demonstrate that addition of hydrogen is beneficial to the improvement of P_ig.