摘要
开展飞行器高温流场等离子体分布数值模拟研究,对飞行器无线电通信系统设计具有重要意义。基于求解热化学非平衡N-S方程的数值方法,发展了复杂三维绕流等离子体数值模拟手段。利用电子数密度飞行测量数据,验证了数值模拟方法的可行性。研究了化学反应模型与热化学非平衡模型、壁面催化和壁面温度条件对流场等离子体分布模拟结果的影响,分析了升力体外形绕流等离子体的分布特性。研究表明:采用7组分与11组分化学反应模型对温度高达10000K的高温空气流场等离子体进行数值模拟,获得的电子数密度存在较大差异,此时模型中除了考虑NO+外,还必须考虑O+等离子的影响;壁面条件特别是壁面材料催化特性对壁面附近等离子体分布有较大影响,获取可靠的壁面材料催化与温度数据是准确模拟升力体绕流等离子体分布的先决条件。
It is important for the design of radio communication system to understand the plasma distribu- tion in high-temperature flowfield. A numerical method to simulate the complicated plasma flow field around a hypersonic flight vehicle is developed by solving the Navier-Stokes equations with thermo-chemieal non- equilibrium source terms. The method is validated by comparison of the distribution of electron number den- sities with flight experiment. The effects of chemical reaction and thermo-ehemical nonequilibrium models, the wall temperatures and catalytic activities on the computational results are studied. The distribution of plasma in flow over a lifting body are investigated too. The results show that the electron number densities computed by seven-species and eleven-species chemical model are different obviously when the flowfield tem- peratures beyond IO000K, and in the case 0＋ must be taken into account in chemical reaction models besides NO＋. The wall conditions, especially the catalytic activities, have a more important effect on the distribu- tion of plasma, the reliable data of the wall catalytic activities, have a more important effect on the distribu- tion of plasma, the reliable data the wall catalytic activities, have a more important effect on the distribution of plasma, the reliable data of the wall catalytic activities, have a more important on the distribution of plas- ma, the reliable data of the wall catalytic activities and temperatures must be obtained firstly in order to sim- ulate exactly the plasma flow over a lift body.
出处
《空气动力学学报》
CSCD
北大核心
2013年第5期541-545,553,共6页
Acta Aerodynamica Sinica
关键词
热化学非平衡
化学反应
等离子体
电子数密度
N—S方程
升力体
thermo-chemical nonequilibrium
chemical reactions
plasma
electron number densities
Navier-Stokes equations
lift body
