丙烷/空气稀薄预混合气流动下的激光点火特性  

Laser ignition characteristics in propane/air lean premixed gas flow

作　　者：张俊杰 郭晓阳 王朝君 胡二江[1] 黄佐华[1] ZHANG Junjie;GUO Xiaoyang;WANG Chaojun;HU Erjiang;HUANG Zuohua(State Key Laboratory of Multiphase Flow in Power Engineering,Xi’an Jiaotong University,Xi’an 710049,China)

机构地区：[1]西安交通大学动力工程多相流国家重点实验室,西安710049

出　　处：《航空动力学报》2023年第3期630-639,共10页Journal of Aerospace Power

基　　金：国家科技重大专项(2017-Ⅰ-0007-0033)。

摘　　要：基于流动点火平台,在不同当量比和流速下,对丙烷/空气稀薄预混气进行了激光点火实验。研究发现:随着当量比和流速的增加,火焰发展速度加快且火焰面积增大;火焰中的CH*发光强度随当量比提升有明显提高,通过CH*的分布及发光强度变化能判断火焰发展阶段。混合气的击穿和点火成功率都随当量比和流速的增加而增加,但改变当量比对成功率的影响比改变流速更大;通过击穿发射光谱中的H/N峰值强度比,可以判断混合气中各组分的含量变化,且使用标定线能确定未知预混合气的当量比。Based on a flow-ignition platform,laser ignition experiments were carried out on the propane/air lean premixed gas for different equivalence ratios and velocities of flow.The study found that with the increase of the equivalence ratio and velocity of flow,the flame development speed increased and the flame area increased;the CH*luminous intensity in the flame increased significantly with the increase of the equivalence ratio,and the stage of flame development could be judged by the CH*distribution and luminous intensity changes.The probability of successful breakdown and ignition of the mixed-gas increased with the increase of the equivalence ratio and the velocity of flow,but the change of the equivalence ratio had a greater impact on the probability than the velocity of flow;the changes of the content of each component in the mixed gas could be judged by the H/N peak intensity ratio in the breakdown emission spectrum,and the calibration line could determine the equivalence ratio of the unknown premixed gas.

关 键 词：激光点火 CH*发光强度 击穿成功率 点火成功率 击穿发射光谱 

分 类 号：V233.3[航空宇航科学与技术—航空宇航推进理论与工程] TK401[动力工程及工程热物理—动力机械及工程]