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Laser Ignition of Propane-Air Mixtures Using a Dual-Pulse Technique

机译：使用双脉冲技术激光点火丙烷 - 空气混合物

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摘要

A novel laser ignition technique based on dual pulse gas pre-ionization and energy addition is demonstrated for combustion of propane-air mixtures. The method uses an ultraviolet (266 nm) laser pulse to achieve initial gas pre-ionization followed by an overlapped near-infrared (1064 nm) pulse for energy addition into the pre-ionized gas. In this experimental study the dual-pulse technique is contrasted with the more common laser induced breakdown ignition using a single (1064 nm) Q-switched laser. Pressure data collected during the combustion event shows that the dual-pulse technique leads to extension of the lean limit and an increase in combustion energy conversion efficiency as compared to single pulse ignition. The leanest mixture that was successfully ignited using the dual-pulse method had an equivalence ratio of Φ = 0.6 as opposed to Φ = 0.7 for single-pulse ignition. Analysis of the pressure curves also shows that the combustion efficiency is higher near the lean limit using the dual-pulse laser ignition technique. Finally, an investigation of the flame speed was conducted by acquiring OH* chemiluminescence images which revealed that flames initiated using the dual-pulse method exhibited less stretching (as compared to single-pulse) which may contribute to the extension of the lean limit.
机译：基于双脉冲预热和能量添加的新型激光点火技术被证明是丙烷空气混合物的燃烧。该方法使用紫外线（266nm）激光脉冲来实现初始气体预热，然后进行重叠的近红外（1064nm）脉冲，用于能量添加到预电离气体中。在该实验研究中，双脉冲技术与使用单个（1064nm）Q开关激光器的更常见的激光诱导的击穿点燃。在燃烧事件期间收集的压力数据表明，与单脉冲点火相比，双脉冲技术导致稀薄限制的延伸和燃烧能量转换效率的增加。使用双脉冲方法成功点燃的最精简的混合物具有φ= 0.6的等效比，而不是用于单脉冲点火的φ= 0.7。压力曲线的分析还表明，使用双脉冲激光点火技术，燃烧效率近近贫极限。最后，通过获取OH *化学发光图像进行对火焰速度的研究，该图像显示使用双脉冲方法引发的火焰呈现较小的拉伸（与单脉冲相比），这可能有助于倾斜极限的延伸。

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