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本文用三点隐式有限差分法数值求解了轴对称流动的层流、转捩和湍流可压缩附面层方程,湍流附面层用两层概念处理,而每一层用适当的涡粘性模型代替Reynolds应力项,用常值湍流Prandtl数将湍流热流项与Reynolds应力关联起来。支配方程用迭代法求解。计算结果表明,采用本文改进的涡粘性模型和涡粘性分布的平滑办法,对文中所计算的几种情况,都给出了满意的结果。
In this paper, the three-point implicit finite difference method is used to numerically solve the laminar flow, turbulent flow and turbulent compressible boundary layer equations of axisymmetric flow. The turbulent boundary layer is treated by two layers of concepts, and each layer is modeled by an appropriate eddy viscosity model Instead of the Reynolds stress term, the turbulent heat flow term is related to the Reynolds stress using the constant Prandtl number of turbulence. The governing equation is solved iteratively. The calculation results show that the satisfactory eddy results of some cases calculated in this paper are obtained by using the improved eddy viscosity model and the eddy viscosity distribution method.