考虑压缩性的Langtry转捩模型对双楔平板附面层复杂流动数值模拟研究(英文)

使用一种修正基于当地变量加入压缩性修正进行转捩判断的转捩模型对高超声速下的双楔平板外形的激波/附面层干扰现象进行了研究,并通过数值计算考量了激波边界层中流场特性受高温壁和前缘钝度的影响。通过与实验数据的比较发现,在第1个斜坡存在层流边界层和层流分离现象,前缘钝度和壁面温度对Kink处的分离特性有着重要的影响,并通过和实验静压分布与纹影法得到的激波附面层比较,使用转捩模型得到了不错的结果。

A Numerical Research on a Compressibility-correlated Langtry’s Transition Model for Double Wedge Boundary Layer Flows

A new compressibility correlation is introduced in the Langtry’s local variable-based transition model to investigate the phenomenon on double wedge shock/boundary layer interactions.The computational analysis compared with experimental data has been made to assess the influence of the wall temperature and the leading edge nose radius on a hypersonic double wedge boundary layer.It has been found that the laminar boundary layer separation occurs on the first ramp.Furthermore,the wall temperature and the leading edge nose radius have remarkable influence on the separation characteristics in the kink.Comparison of the calculated pressure coefficient distribution and the boundary layer profile with the experimental data shows that better results can be achieved when using the modified transition model.