采用层流模型、Gammatheta转捩模型和SST湍流模型对半顶角10°的圆锥前体进行大攻角绕流的数值模拟,以探究其流动特性。给出了30m/s,不同攻角下流场的总压系数、速度矢量和涡量云图。研究发现,采用Gammatheta转换模型可较好的模拟转捩流动;攻角大于10°时出现主涡,每个主涡都有一个总压系数最小值和无量纲的轴向涡量绝对最大值,它们均位于涡核处,量值随风速和攻角而变化。

High angle-of-attack flow over a 20° conical forebody was computed with laminar model, Gamma theta transition model and turbulence model to study the flow characteristics. The contour of computed total pressure coefficient, velocity vector and axial vorticity distributions over the cross-flow plane at 30m/s and different angle-of-attack were plotted here for study. Through the comparison of experimental data with numerical solution, we can get that gamma theta transition model is proper to model flows mainly in transitional region. For angleof-attack greater than 10°, the port and starboard primary vortex occur. Each of them has a minimum value of total pressure coefficient and a maximum absolute value of non-dimensional axial vorticity in the vortex core. Both of them vary with the angle-of-attack and the wind velocity in some regular patterns.