A thermochemical nonequilibrium analysis was performed under the low enthalpy shock-tunnel flows. A quasi-one-dimensional flow calculation was employed by dividing the flow calculations into two parts, for the shock-tube and the Mach 6 nozzle. To describe the thermochemical nonequilibrium of the low enthalpy shock-tunnel flows, a three-temperature model is proposed. The three-temperature model treats the vibrational nonequilibrium of O2 and NO separately from the single nonequilibrium energy mode of the previous two-temperature model. In the three-temperature model, electron-electronic energies and vibrational energy of N2 are grouped as one energy mode, and vibrational energies of O2, O2+, and NO are grouped as another energy mode. The results for the shock-tunnel flows calculated using the three-temperature model were then compared with existing experimental data and the results obtained from one- and two-temperature models, for various operating conditions of the K1 shock-tunnel facility. The results of the thermochemical nonequilibrium analysis of the low enthalpy shock-tunnel flows suggest that the nonequilibrium characteristics of N2 and O2 need to be treated separately. The vibrational relaxation of O2 is much faster than that of N2 in low enthalpy condition, and the dissociation rate of O2 is manly influenced by the species vibrational temperature of O2. The proposed three-temperature model is able to describe the thermochemical nonequilibrium characteristics of N2 and O2 behind the incident and reflected shock waves, and the rapid vibrational freezing of N2 in nozzle expanding flows.
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机译：低焓冲击隧道流动下进行热化学非平衡分析。采用将流量计算分成两部分，用于冲击管和马赫6喷嘴来采用准一维流量计算。为了描述低焓震动隧道流动的热化学非预测，提出了一种三温模型。三温模型处理O2的振动非Quizibibium，与先前的两温模型的单个非纤维能模式分开。在三温模型中，N2的电子 - 电子能量和振动能量被分组为一个能量模式，并且O2，O2 +的振动能量被分组为另一种能量模式。然后将使用三温模型计算的冲击隧道流量与现有的实验数据进行比较，并从单温模型获得的结果，用于K1冲击隧道设施的各种操作条件。低焓抗冲击隧道流量的热化学缺陷分析结果表明，N2和O2的非预测特征需要单独处理。 O 2的振动弛豫比低焓条件的N2的振动弛豫要快得多，并且O2的解离速率受到O2的物种振动温度的人们的影响。所提出的三温模型能够描述入射和反射冲击波后面的N2和O2的热化学非核状特性，并且在喷嘴扩张流动中的N2快速振动冷冻。
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