应用加权紧致非线性格式的VFE-2钝前缘三角翼转捩模拟

为研究前缘转捩对钝前缘三角翼涡结构的影响，采用高阶精度加权紧致非线性格式和γ－Reθ 转捩模型对VFE-2中等半径钝前缘三角翼进行数值模拟。将计算结果与试验结果进行详细对比，结果表明：钝前缘三角翼的前缘分离涡发生在翼尖下游，在特定雷诺数下其具体发生位置受转捩因素影响，采用全湍流模型计算会推迟分离，而耦合转捩模型后的计算结果和试验结果吻合良好。运用耦合转捩模型方法，对钝前缘三角翼涡结构随迎角变化进行模拟。计算结果与试验结果吻合，表明在较小的迎角下，前缘不会产生分离诱导涡；随迎角不断增大，分离诱导涡在三角翼后缘附近产生并向上游移动。
In order to evaluate the influence of transition on the vortex structure of delta wing, a numerical simulation of VFE-2 rounded leading edge delta wing was carried out by using a high-order scheme-weighted compact nonlinear scheme and the γ－Reθ transition model. A comparisons between calculated results and experiment data indicate that the leading edge vortex begins at a certain distance of the wing apex and the transition has great influence on the onset of leading edge vortex. Using turbulence model without transition, the leading edge separation is delayed much, while with transition model the calculated results show a good agreement with experiment data. With transition model, numerical simulation on VFE-2 rounded leading edge delta wing at variation of the angle-of-attack was carried out. The calculated results which agree well with experiment data show that at a low angle-of-attack, there is no separation-induced leading-edge vortex, but with the increase of angle-of-attack the leading edge separation displays being closer to the trailing edge and moves upstream.