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首页> 外文期刊>Acta astronautica >Dynamic characteristics of a gliding arc plasma-assisted ignition in a cavity-based scramjet combustor
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Dynamic characteristics of a gliding arc plasma-assisted ignition in a cavity-based scramjet combustor

机译：基于腔的超燃喷射燃烧室中滑行电弧等离子体辅助点火的动态特性

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摘要

A gliding arc discharge with an averaged power of 630 W at atmospheric pressure was used to ignite an ethylene-fueled scramjet combustor with an inflow speed of Mach number 2.92. The instantaneous power of the plasma and the high-speed CH* chemiluminescence imaging of the ignition process was simultaneously measured to show dynamic characteristics of the gliding arc plasma-assisted ignition. The results show that the power spikes of the spark-type discharges are the key factor to generate the flame kernel in the scramjet combustor and the instantaneous power can reach 3168 W during the power spikes. The flame kernel ignited by the gliding arc discharge can be developed to form an initial flame, which can become larger with increasing contained discharge energy of the gliding arc. Moreover, a comparison between the successful initial flame and the failed initial flame is performed to demonstrate that the larger area of the successful initial flame can propagate for achieving the mainstream flame, whereas the failed initial flame generated multiple times until the successful initial flame was observed. It is concluded that the successful initial flame contains more discharge energy during the initial flame formation, leading to form the resident flame in the recirculation zone.
机译：在大气压下，平均功率为630 W的滑动电弧放电用于点燃流入速度为马赫数2.92的乙烯燃料超燃式燃烧器。同时测量了等离子体的瞬时功率和点火过程的高速CH *化学发光成像，以显示滑弧等离子体辅助点火的动态特性。结果表明，火花型放电的功率峰值是在超燃冲压燃烧器中产生火焰核的关键因素，功率峰值期间的瞬时功率可以达到3168W。可以产生由滑动电弧放电点燃的火焰核，以形成初始火焰，该初始火焰随着滑动电弧所包含的放电能量的增加而变得更大。此外，通过比较成功的初始火焰和失败的初始火焰，可以证明成功的初始火焰的较大区域可以传播以达到主流火焰，而失败的初始火焰会生成多次，直到观察到成功的初始火焰为止。 。结论是，成功的初始火焰在初始火焰形成期间包含更多的放电能量，从而导致在再循环区域中形成驻留火焰。

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  • 来源
    《Acta astronautica》 |2020年第6期|238-244|共7页
  • 作者

  • 作者单位

    Natl Univ Def Technol Sci & Technol Scramjet Lab Changsha 410073 Hunan Peoples R China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Gliding arc plasma; Ignition; Scramjet combustor; Initial flame;

    机译：滑弧等离子;点火;Scramjet燃烧器;初始火焰;

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