Numerical Investigation of Nonequilibrium Plasma Flows in Constrictor- and Segmented-Type Arc Heaters
Numerical Investigation of Nonequilibrium Plasma Flows in Constrictor- and Segmented-Type Arc Heaters
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DOI：
10.2514/1.43565
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发表时间：
2010
影响因子：
2.1
通讯作者：
Yusuke Takahashi;H. Kihara;K. Abe
中科院分区：
文献类型：
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作者：
Yusuke Takahashi;H. Kihara;K. Abe
对20kW缩管式风洞和750kW分段弧热式风洞的非平衡流动进行了数值模拟，得到了非平衡流动的流场特性分布。在这些电弧炉中，证实了各等离子体流高度不平衡，而弧光放电起着至关重要的作用。流场采用多温度模型的N-S方程描述。为了验证所提出的数值模型，将数值解与相应的实验数据进行了比较。通过模拟，了解了20kW和750kW电弧炉内的流动特性(如弧光放电和超音速膨胀)。特别是对20kW电弧炉的计算结果表明，在收缩段几乎完全发生解离/电离反应和热化学平衡，而在喷嘴段则明显地出现了强烈的非平衡。
Numerical simulations are carried out and the distributions of flowfield properties are obtained for nonequilibrium flows in a 20 kW constrictor-type and a 750 kW segmented-type arc-heated wind tunnel. In these arc heaters, it is confirmed that each plasma flow is highly in nonequilibrium and arc discharge plays critical roles. The flowfield is described by the Navier-Stokes equations with a multitemperature model. To validate the present numerical model, the numerical solutions are compared with the corresponding experimental data. The flow characteristics in the 20 and 750 kW arc heaters (e.g., the arc discharge and the supersonic expansion) become clear through the present simulations. In particular, the computed results for the 20 kW arc heater indicate almost full dissociation/ionization reactions and thermochemical equilibrium in the constrictor section, while strong nonequilibrium clearly appears in the nozzle section.