基于Gamma-Theta模型的固定转捩数值模拟研究

摘要

采用tγ−Reθ~转捩模型，对NACA0012翼型的固定转捩进行数值模拟，计算了不同雷诺数下刚好激发转捩又不引起过大局部压力扰动和附加阻力的最低粗糙带高度，说明了 tγ−Reθ~模型模拟固定转捩的能力。通过计算低雷诺数下固定转捩来模拟高雷诺数下自然转捩，计算结果表明固定转捩可以较好地模拟自然转捩。这两种计算结果对风洞试验都有重要的指导意义。%Numerically predicted the ifxed artiifcial transition on NACA0012 airfoil with transition model, the optimal roughness height trigger transition without causing excessive pressure disturbance near the roughness and without bringing extra drag was calculated. The numerical results indicated this model was able to simulate the ifxed artiifcial transition. The ability of ifxed artiifcial transition under low Reynolds number in a wind tunnel to simulate free transition under full-scale high Reynolds number in real atmospheric flight was assessed, it turned out that fixed artificial transition can simulate the free transition well. It is expected that the results will serve as guidance for ifxed artiifcial transition experiments.