电弧风洞内球锥全目标绕流场计算分析

针对电弧风洞高焓气体来流条件,通过数值求解三维化学非平衡Navier-Stokes方程,分析无烧蚀球锥全目标绕流场真实气体效应.考虑空气电离化学反应系统,包含7个化学组元和6个反应方程.差分算法是隐式NND格式.依据实验来流条件,计算了不同壁温及不同壁面催化特性下的流场结构和电子数密度,观察了来流非均匀性的影响.结果表明.尾迹区对模拟条件较敏感,其电子数密度随壁温降低而升高,完全催化壁的电子数密度约比非催化壁低近一个量级,实验状态的计算应采用风洞实际来流条件,

Numerical analysis of complete flowfields around a spherical cone model in electric arc wind tunnel

On the incoming flow condition of high enthalpy air in an electric arc wind tunnel, three-dimensional chemical non- equilibrium Navier-Stokes equations are solved numerically to analyze real gas effect in complete flowfields around a non-ablated spherical cone model. The chemical kinetics model of ionized-air consists of seven chemical species and six chemical reactions. Numerical algorithm is an implicit finite difference method related to the NND scheme. An experimental incoming flow condition is employed in the computations, and flow structures and electron number density are obtained for cases of different wall temperatures and different catalyzing walls. Effect of non-uniformity in experimental incoming flow is investigated. Results show that simulated flow in wake is sensitive to boundary conditions. In wake, electron number density at low wall temperature is larger than that at high wall temperature, and electron number density of fully-catalyzing wall case is one order smaller than that of non-catalyzing wall case. Numerical study on experimental flow fields should use wind tunnel air conditions.