扩压器内二维湍流流动的时间推进数值解

ＡＦ有限差分理论。指出薄层Ｎ－Ｓ方程抛物化后右端粘性项是主元素变量矢的一个简单线性函数，这对实际计算很有用。应用隐式ＡＦ方法计算了为发动机进气道设计的典型扩压器内的复杂湍流流场。研究表明，计算结果与实验结果基本一致，这为三维非定常湍流流动进一步研究提供了基础。

NUMERICAL ANALYSIS ON TURBULENT FLOW IN A DIFFUSER BY TIME MARCHING METHOD

An investigation is given on the theory of implicit approximate factorized finite difference firstly. The results show that the viscous Right-hand-side vector is a simple linear function of its basic variable vector. which is of great use for further application. A complicated turbulent flow field in a diffuser with typical geometric shape for aeroengine inlet design was calculated by the use of the implicit AF method. Studies show that the computational results are in agreement with the experimental data, which will provide the basis for the further study on three dimensional unsteady turbulent flows.