Institut PRISME, UPRES EA 4229, IUT de Bourges, 63 avenue de Lattre de Tassigny, 18020 Bourges Cedex, France.
J Hazard Mater. 2012 Mar 30;209-210:372-8. doi: 10.1016/j.jhazmat.2012.01.040. Epub 2012 Jan 21.
The breakdown and the laser-induced spark ignition of acetone-air mixtures were experimentally studied using a nanosecond pulse at 1064 nm from a Q-switched Nd:YAG laser. The breakdown was first characterized for different mixtures with acetone and air. This part of the work highlighted the wide variation in the energy absorbed by the plasma during a breakdown. We also demonstrated that the presence of acetone in air tends to reduce the energy required to obtain a breakdown. Next, the ignition of acetone-air mixtures in the equivalence ratio range 0.9-2.4 was investigated. The probabilities of ignition were calculated in function to the laser energy. However, according to the variability of energy absorption by the plasma, we preferred to present the result according to the energy absorbed by the plasma. The minimum ignition energies were also provided. The minimum ignition energy was obtained for an equivalence ratio of 1.6 and an absorbed energy of 1.15 mJ. Finally the characteristics of the plasma (absorption coefficient and kernel temperature) were calculated for the experiments corresponding to minimum ignition energies.
使用纳秒脉冲（波长 1064nm，来自调 Q 的 Nd:YAG 激光器），从实验上研究了丙酮-空气混合物的分解和激光诱导火花点火。首先，针对不同的丙酮-空气混合物，对分解进行了特性描述。这部分工作强调了等离子体在分解过程中吸收的能量有很大的变化。我们还证明了空气中存在丙酮会降低获得分解所需的能量。接下来，研究了当量比为 0.9-2.4 的丙酮-空气混合物的点火。点火概率根据激光能量进行了计算。然而，根据等离子体吸收能量的可变性，我们更倾向于根据等离子体吸收的能量来呈现结果。还提供了最小点火能量。在当量比为 1.6 和吸收能量为 1.15mJ 时，获得了最小点火能量。最后，针对对应于最小点火能量的实验，计算了等离子体的特性（吸收系数和核心温度）。
