基于激波管的等离子体辅助甲烷点火  

Plasma assisted methane ignition based on shock tube

作　　者：沈双晏 金星 邓同晔 张鹏 SHEN Shuangyan;JIN Xing;DENG Tongye;ZHANG Peng(State Key Laboratory of Laser Propulsion and Space Engineering University, Beijing 101416 China;Satellite Maritime Tracking and Control Jiangyin Jiangsu, 214431, China） Application , China~ Department)

机构地区：[1]航天工程大学激光推进及其应用国家重点实验室,北京101416 [2]中国卫星海上测控部,江苏江阴214431

出　　处：《航空动力学报》2018年第3期572-580,共9页Journal of Aerospace Power

基　　金：国家自然科学基金(11372356)

摘　　要：在激波管实验系统的基础上,设计了等离子体放电单元,开展了等离子体对甲烷点火延迟时间影响的研究。测量了等离子体放电时的伏安特性曲线。测量了甲烷自点火延迟时间、持续放电条件下的点火延迟时间以及放电后断电下的点火延迟时间。对甲烷点火过程中的化学反应路径进行了分析。结果表明:等离子体放电电压与电流并不呈现相同的变化趋势,放电过程中气体电阻不断发生变化。很少的放电能量(小于4J)即可有效减少甲烷的点火延迟时间,在关闭电源后,放电产生的粒子依然可以在一定程度降低甲烷点火延迟时间。在低温或高温点火条件下等离子体对甲烷点火延迟时间的影响机理基本相同。点火温度较低(小于1 000K),或者较高(大于1 600K)时,持续放电对甲烷点火延迟的缩短效果更加明显,可以将甲烷的点火延迟时间缩短1个数量级或1个数量级以上。等离子体对甲烷点火延迟的作用效果是点火温度与等离子体质量摩尔浓度耦合影响的结果。The plasma discharge unit was designed based on the shock tube experiment system,and the plasma discharge VA characteristic curve was measured.The auto ignition delay,ignition delay with continuous discharge and ignition delay after the discharge shut down were measured.The chemical reaction path in the methane ignition process was analyzed.The results showed that the plasma discharge voltage and current did not present the same change trend.The gas resistance changed continuously in the discharge process.Little discharge energy（less than 4 J）can effectively reduce the methane ignition delay.The particles produced during the discharge could reduce the methane ignition delay in a certain degree after the power was shut down.The influence mechanism of plasma assisted methane ignition under the low or high ignition temperature condition was basically the same.The effects of continuous discharge were more apparent to reduce the methane ignition delay time when the ignition temperature was relatively low（less than 1000 K）or high（greater than 1600 K）.The methane ignition delay could be shortened in an order of magnitude or more than one order of magnitude.It was a result of coupling effect of ignition temperature and plasma concentration act to the methane ignition delay.

关 键 词：激波管 等离子体 甲烷 点火延迟 辅助点火 化学反应路径 

分 类 号：V21[航空宇航科学与技术—航空宇航推进理论与工程] O539[理学—等离子体物理]