烧蚀外形转捩流动的数值模拟

本文采用雷诺平均Navier-Stokes方程和修正Baldwin-Lomax代数湍流模型,以Roe二阶流通量差分分裂格式进行离散,数值模拟了典型烧蚀外形的高超声速流场,重点讨论了流动转捩的判定及其与复杂流态的关联.结果表明:数值模拟出的球钝锥外形转捩点位置与工程估算结果符合较好;对工程估算中存在困难的奶头状凹陷烧蚀外形,数值模拟也可给出符合流场结构的转捩点位置.

Numerical simulation on transitional flows around ablated configuration

Numerical simulation on supersonic flows around typical ablation configuration are conducted to explore the transition estimation and the connections between transition and complex flows. Reynolds averaged Navier-Stokes equations and modified Baldwin-Lomax algebraic turbulence model are adopted and the convection part is dispersed using Roe second order scheme. The results indicate that the location of numerical transition point about blunt cone is quite close to that of engineering estimation and that numerical transition location corresponding to flow structure about cupped mastoid ablated configuration can be obtained successfully which falls to be predicted by engineering method.