氩气电离非平衡等离子体气动效应数值模拟研究
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摘要
结合自主设计的助燃激励器结构,在5400V电压条件下对氩气电离过程进行了数值模拟分析,得到了电子密度、活性粒子浓度、气体运动速度等随时间的变化规律。结果表明,电子密度在放电开始阶段迅速增加,之后逐渐下降,电子密度消失的速度从电离区间的中部向着两极逐渐减缓,最后急剧减少; Ar+离子浓度在放电开始后急剧增加,之后随着时间推移以每0. 01s降低一个量级的速度下降,当t=0. 35s时摩尔分数基本达到初始状态;等离子体对流场的扰动从放电开始的0. 005 m/s不断地波动式的减少,当总电场不能使放电继续产生时,等离子体的气动效应随即停止。
Combined with the self-designed combustion boost actuator,an argon ionization process is numerically simulated under the 5400 V voltage condition to obtain the changes of electron density,active particles concentration and gas velocity with time. The results showthat the electron density increases rapidly at the beginning stage of discharge,and then decreases gradually. The velocity of the electron density gradually decreases from the middle of ionization interval to the electrode,and finally decreases sharply. The concentration of Ar + ions increases significantly after the discharge starts,and then decreases with one order of magnitude per 0. 01 s. Mole fraction basically reaches the initial state when t = 0. 35 s. The disturbance of the plasma to the flowfield decreases persistently from 0. 005 m/s at the beginning stage of discharge. The aerodynamic effect of the plasma stops until the total electric field could not continue to discharge.
Combined with the self-designed combustion boost actuator,an argon ionization process is numerically simulated under the 5400 V voltage condition to obtain the changes of electron density,active particles concentration and gas velocity with time. The results showthat the electron density increases rapidly at the beginning stage of discharge,and then decreases gradually. The velocity of the electron density gradually decreases from the middle of ionization interval to the electrode,and finally decreases sharply. The concentration of Ar + ions increases significantly after the discharge starts,and then decreases with one order of magnitude per 0. 01 s. Mole fraction basically reaches the initial state when t = 0. 35 s. The disturbance of the plasma to the flowfield decreases persistently from 0. 005 m/s at the beginning stage of discharge. The aerodynamic effect of the plasma stops until the total electric field could not continue to discharge.
引文
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[16] A KLIMOV,V BITYURIN,I MONKALEV,et al.Plasma-assisted ignition and combustion[J]. Journal of Physics D Appried Physics,2016,39(16):265.
[2]吴云,李应红.离子体流动控制与点火助燃研究进展[J].高电压技术,2014,40(7):2024-2038.
[3] JU Y. G,SUN WT. Plasma assisted combustion:Dynamics and chemistry[J]. Progress in Energy and Combustion Science,2015,48:21-83.
[4]梁华,李应红,吴云,等.等离子体气动激励的数值仿真[J].高电压技术,2009,35(5):1071-1076.
[5]梁华,李应红,程邦勤,等.等离子体气动激励抑制翼型失速分离的仿真研究[J].航空动力学报,2008,23(5):777-783.
[6] LAUX C O,SPENCE T G,KRUGER C H,et al. Optical diagnostics of atmospheric pressure air plasmas[J]. Plasma Source Science and Technology,2003,12(2):125-138
[7] ONO R,YAMASHITA Y,TAKEZAWA K,et al. Behavior of atomic oxygen in a pulsed dielectric barrier discharge measured by laser-induced fluorescence[J].Journal of Physics D:Applied Physics,2005,38(16):2812-2816.
[8] CZEMICHOWSKI A. Gliding arc applications to engineering and environment control[J]. Pure and Applied Chemistry,1994,66(6):1301-1310.
[9] KRASNOCHUB A V,VASILYAK L M. Dependence of the energy deposition of a fast ionization w ave on the impedance of a discharge gap[J]. Journal of Physics D:Applied Physics,2006,34(11):1678-1682.
[10]KIM W,MUNGAL M G,MARK A,et al. The role of in situ reforming in plasma enhanced ultra lean premixed methane/air flames[J]. Combustion and Flame,2010,157(2):374-383.
[11]LACOSTE D A,XU D A,MOECK J P,et al. Dynamic response of a w eakly turbulent lean-premixed flame to nanosecond repetitively pulsed discharges[J]. Proceedings of the Combustion Institute,2013,34(2):3259-3266.
[12]杜宏亮,何立明,丁伟,等.氩气/空气等离子体助燃激励器的实验研究[J].光谱学与光谱分析,2012,32(2):293-296.
[13]姜春阳,夏胜国,邹鑫,等.介质阻挡放电边缘电场对甲烷燃烧强化的影响[J].高电压技术,2009,35(1):26-30.
[14] SRIVASTAVA D,AGARWAL A. Combustion characteristics of a variable compression ratio laser plasma ignited compressed natural gas engine[J]. Fuel,2018(214):322-329.
[15]MOON S B,MARK A C. Simulations of nanosecond pulsed dielectric barrier discharges[J]. Journal of Applied Physics,2013,113(11):113301. 1-113301. 6.
[16] A KLIMOV,V BITYURIN,I MONKALEV,et al.Plasma-assisted ignition and combustion[J]. Journal of Physics D Appried Physics,2016,39(16):265.