非结构网格热化学非平衡辐射流场数值计算

针对三维热化学非平衡辐射流场设计了基于非结构网格的数值计算方法. 根据原子分子光谱理论逐条计算了100$\sim$1\,500\,nm间N, O, N$^{ + }$, O$^{ + }$的谱线以及N计算流体力学; 辐射; 热化学非平衡; 非结构网格; 有限体积法针对三维热化学非平衡辐射流场设计了基于非结构网格的数值计算方法.根据原子分子光谱理论逐条计算了100～1 500nm间N,O,N+,O+的谱线以及N2,O2,NO,N+2等分子的10个谱带,特别分析了NO的β'带,γ'带,δ带和ε带的辐射特性.采用耦合辐射的双温模型计算热化学非平衡流场,辐射源项通过直接求解辐射输运方程RTE(radiative transport equation)获得.在空间和方向上分别离散后,利用有限体积法求解不同方向上的辐射输运方程.计算得出了再入飞行器前驻点的辐射强度分布.采用该数值方法计算了MUSES-C模型在速度为11.6km/s时的绕流流场及前驻点处的辐射热流密度.并通过对比分析了热辐射对流场的影响.

NUMERICAL STUDY OF IONIZED HYPERSONIC AIR FLOW WITH RADIATION

A numerical method for an ionized hypersonic air flowwith radiation under thermo-chemical nonequilibrium condition has beendeveloped with multi-species N-S equations based on unstructured mesh. Inthe algorithm, there are 11 chemical species (O$_{2}$, N$_{2}$, O, N,NO, NO$^{+}$, N$^+$, O$^+$, N$_2^+$, O$_2^+$, e$^{ - }$), 20 chemicalreactions, and two temperature models subjectedto thermal nonequilibrium effect. Radiation transfer equation (RTE) wassolved by finite volume method. In particular, the Delta, Epsilon, Beta primeand Gamma prime bands of NO were introduced in this paper. The numericalresults of MUSES-C were shown and compared well with the reference data. Theinfluence of radiation was also discussed.