等离子体喷嘴在超燃燃烧室中助燃的研究

Research on Assisted Combustion Effect of Plasma Nozzle in Scramjet Combustor

为提高超燃冲压发动机燃烧效率,参考国内外研究给出了介质阻挡放电等离子体喷嘴基本构型并设计了电弧放电等离子体喷嘴基本构型,数值模拟了电弧(ARC)和介质阻挡放电(DBD)两种等离子体喷嘴安装在火焰稳定凹腔上游时的流场燃烧过程,研究了喷注氢气时等离子体对燃烧室各组分及温度、压力等关键参数的影响。结果表明:产物中水生成量有一定程度的增加,燃烧室压力、温度也有不同程度增长,起到了助燃效果,但电弧喷嘴的助燃效果更明显。

To raise the combustion efficiency of scramjet combustor, the plasma nozzle based on dielectric barrier discharge was given by referring others＇ researches and the basic configuration of plasma nozzle based on arc discharge was designed in this paper. The combustion in the combustor with two kinds of plasma nozzle located upstream of the flameholding cavity which were arc discharge plasma nozzle and the DBD plasma nozzle was numerical simulated. The changes of components and other important parameters of temperature and pressure in the combustor caused by the plasma jet were studied. The results showed that the percentage of product water was increased in a certain degree and so did the mean pressure and the temperature in the combustor. The performance of arc discharge plasma nozzle was better than the DBD plasma nozzle.