摘要
为考察纳秒脉冲介质阻挡放电(NP-DBD)等离子体对超声速燃烧室中凹腔性能的影响,在凹腔后壁面上部区域布置表面介质阻挡放电激励器产生等离子体,基于NP-DBD等离子体高斯分布热源模型,采用3维数值模拟方法研究了等离子体作用下燃烧室壁面压力、凹腔阻力、质量交换率以及燃料分布的变化。研究结果表明,NP-DBD等离子体虽然降低了对称面处凹腔后缘波系强度,但结合凹腔后壁区域温度分布特征知等离子体热效应较弱,故整个凹腔波系受到影响较小;凹腔质量交换能力获得大幅提高,其阻力则略有减小;等离子体缩小了凹腔上方燃料的分布范围,凹腔下游燃料掺混效率有小幅提升。
To investigate the effect of nanosecond pulse dielectric barrier discharge （NP-DBD） on the cavity performancein scramjet combustor, by setting surface DBD electrodes on the upper part of cavity rear wall to generate plasma, on thebasis of the Gaussian distribution heat source model of NP-DBD plasma, we investigated the effects of plasma on com-bustor wall pressure, cavity drag, mass exchange rate, and fuel spread through 3-D numerical simulation. The resultsindicate that the waves near the rear edge in the symmetry face are weakened by NP-DBD plasma while they barelychange at the side of symmetry face, because the heat effect is rather weak here （considering the temperature profile onthe rear wall）. As the plasma spreads wide upon the whole rear wall, the cavity mass exchange is enhanced prominentlyand the cavity drag decreases slightly. Although fuel distribution shrinks over the cavity, its mixing efficiency slightly ris-es downstream of the cavity.
出处
《高电压技术》
EI
CAS
CSCD
北大核心
2014年第10期3032-3037,共6页
High Voltage Engineering
基金
国家自然科学基金(11205244)~~
关键词
纳秒脉冲介质阻挡放电
超声速燃烧室
凹腔
等离子体
高斯分布
数值模拟
nanosecond pulsed dielectric barrier discharge
supersonic combustor
cavity
plasma
Gaussian distribution
numerical simulation
