This article presents an experimental quantification of the ignition risk of flammable mixtures in conditions relevant to industry and aviation environment. More specifically, the effect of resistive material on ignition of flammable mixtures was investigated by applying a 500-ns duration high-voltage pulse between pin-to-pin electrodes located across a jet flow of ethylene and air, at atmospheric pressure. Fuel-rich, stoichiometric, and fuel-lean equivalence ratios were considered. A parametric study of the effect of the applied voltage and electrode material was performed. The electrical energy deposited in the discharges was determined from current and voltage measurements. Direct visualization of the sparks and the ignition kernel was performed in order to better understand the early stages of the ignition process. The results showed that the use of highly resistive electrodes compared to metallic electrodes: 1) could significantly reduce the energy deposition in the interelectrode area; and 2) could increase the minimum ignition energy. Therefore, the use of highly resistive material wires instead of metallic wires could offer safer conditions with respect to the ignition hazard in flammable environments.

中文翻译：

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电极材料对乙烯-空气混合物点火的影响

本文介绍了在与工业和航空环境相关的条件下易燃混合物着火风险的实验量化。更具体地说，在大气压下，通过在跨越乙烯和空气射流的针对针电极之间施加 500 ns 持续时间的高压脉冲来研究电阻材料对易燃混合物点燃的影响。考虑了富燃料、化学计量和贫燃料当量比。对施加的电压和电极材料的影响进行了参数研究。放电中沉积的电能由电流和电压测量值确定。对火花和点火内核进行了直接可视化，以便更好地了解点火过程的早期阶段。结果表明，与金属电极相比，使用高电阻电极：1）可以显着减少电极间区域的能量沉积；2) 可以提高最小点火能量。因此，使用高电阻材料线代替金属线可以为易燃环境中的点火危险提供更安全的条件。