关于CO与Ar,He和H2的热不平衡行为的实验和数值研究
Dong He1,2, Qizhen Hong2, Fei Li2
1Deep Space Exploration Laboratory, Department of Modern Mechanics, University of Science and Technology of China, Hefei 230026, People's Republic of China.
这项研究测量了不同碰撞伙伴的一氧化碳 (CO) 热不平衡行为. 州对州的方法准确地预测了振动温度,揭示了冲击后的不平衡分布.
科学领域:
- 化学动力学 化学动力学
- 热力学是一种热力学.
- 频谱学是一种光谱学.
背景情况:
- 了解热不平衡对于高温气体动态至关重要.
- 一氧化碳 (CO) 是燃烧和等离子体过程中的关键分子.
- 之前的模型,如兰道-泰勒,在描述复杂的放松现象方面存在局限性.
研究的目的:
- 为了研究冲击加热CO的时间依赖的旋转和振动温度.
- 为了研究CO与Ar,He和H2碰撞伙伴的热不平衡行为.
- 将实验数据与兰道-泰勒和州对州模型的预测进行比较.
主要方法:
- 在CO的基本振动频段中使用无干扰的过渡线路进行in situ测量.
- 采用州对州的方法,将振动能量水平视为伪物种.
- 使用混合量子经典和半经典模型计算了特定状态的不弹性速率系数.
主要成果:
- 旋转温度瞬间达到平衡,而振动温度显示放松过程.
- 州对州的方法准确地预测了测量的振动温度时间历史和不平衡分布.
- 与实验数据相比,兰道-泰勒模型预测放松时间较慢.
结论:
- 状态对状态的方法提供了更准确的描述,对冲击加热CO的热不平衡.
- 在后冲击区域中不存在平衡振动分布.
- 为了提高性能,建议对兰道-泰勒模型进行修改.
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