摘要
为进一步优化等离子体射流点火器的结构,提高点火器的工作性能,在自主设计的等离子体点火实验系统的基础上,开展了阳极通道长度对等离子体射流点火器特性影响的实验研究,选取的阳极通道长度为3mm,5mm和7mm。获得了等离子体射流点火器的放电特性、光谱特性、射流特性和点火特性。结果表明:增大阳极通道长度能够抑制电弧分流的幅度,减小电极的烧蚀面积,但提高了击穿电压,使引弧更加困难;随着阳极通道长度的增大,氮分子离子的转动温度和振动温度分别呈现出先升高后降低和先降低后升高的变化趋势;煤油/空气混合气的点火延迟时间随阳极通道长度的增加,呈现出先减小后增大的变化趋势,余气系数为1.43时,阳极通道长度5mm时的点火延迟时间为14.4ms,相对于阳极通道长度3mm,7mm下的点火延迟时间分别减小了21.1%,12.1%。
For optimizing the structure of plasma jet igniter and improving its performance,the effect of anode channel length,including discharge characteristic,spectrum characteristic,jet characteristic and ignition characteristic,were studied experimentally on the basis of the self-designed plasma ignition experimental system. The selected anode channel length is 3 mm,5 mm and 7 mm. The results indicate that with the increasing of the anode channel length the magnitude of the arc shunting is suppressed,the ablation area of the electrode is reduced,but the elongation of anode channel will lead to breakdown voltage increase,and the arc ignition process will be more difficult. With the increasing of anode channel length,rotational temperature of nitrogen molecular ions is rising firstly and then decreasing,while vibrational temperature shows the opposite trend. And the ignition delay time of kerosene/air mixture shows the trend of decreasing firstly and then increasing. When excess air coefficient is 1.43,the ignition delay time of 5 mm anode channel length is 14.4 ms. Compared with the 3 mm and 7 mm anode channel length,the ignition delay time is reduced by 21.1% and 12.1%,respectively.
作者
戴文峰
何立明
张华磊
陈高成
赵子晨
祁文涛
DAI Wen-feng;HE Li-ming;ZHANG Hua-lei;CHEN Gao-cheng;ZHAO Zi-chen;QI Wen-tao(Aeronautics Engineering College,Air Force Engineering University,Xi＇an 710038,China;Chinese People＇ s Liberation Army with Number of 94973,Hangzhou 310000,China)
出处
《推进技术》
EI
CAS
CSCD
北大核心
2018年第7期1568-1575,共8页
Journal of Propulsion Technology
基金
国家自然科学基金(51436008)
关键词
等离子体射流点火
阳极通道长度
放电特性
光谱特性
点火延迟
Plasma jet ignition
Anode channel length
Discharge characteristic
Spectrum characteristic
Ignition delay
