On the accuracy of two-temperature models for hypersonic nonequilibrium flow [高超声速热化学非平衡流动双温度模型的精度研究]

作者：Wang X.; Hong Q.; Hu Y.; Sun Q.

来源：Acta Mechanica Sinica, 2023, 39(2): 122193.

DOI：10.1007/s10409-022-22193-x

• Non-Boltzmann effect
• Nonequilibrium flow
• Quasi-classical trajectory
• Two-temperature model
• Vibration-dissociation coupling effect

Due to the empirical assumptions, the widely-used two-temperature models for hypersonic nonequilibrium flow include considerable uncertainties. To overcome the limitations and shortcomings of two-temperature models, the modified Macheret-Fridman model is developed based on the correction method of the modified Marrone-Treanor model. Some typical test cases are employed to assess the accuracy of the modified and widely-used two-temperature models. Furthermore, the reason for improving the accuracy of modified two-temperature models is analyzed and discussed. This work indicates that the correction method based on the modified Marrone-Treanor model is easily applied and extended to the other widely-used two-temperature models, significantly improving their accuracy. In addition, modeling highly nonequilibrium dissociating flows requires considering three critical respects, i.e., the dissociation rates, the vibration-dissociation coupling effect, and the non-Boltzmann effect. The non-Boltzmann effect reduces the dissociation rates and vibrational energy per dissociation. Comparatively, the dissociation rates have more influence than changing the value of the non-Boltzmann factor for vibrational energy loss per dissociation. Future work can focus on enhancing the accuracy of the dissociation rates to improve the accuracy of widely-used two-temperature models. [Figure not available: see fulltext.] ? 2022, The Chinese Society of Theoretical and Applied Mechanics and Springer-Verlag GmbH Germany, part of Springer Nature.

• 单位
  高温气体动力学国家重点实验室; 中国科学院大学