任意边界扩压器内紊流流动的时间推进数值计算

NUMERICAL ANALYSIS ON TURBULENT FLOW IN A DIFFUSER WITH ANY GEOMETRIC SHAPE BY TIME MARCHING METHOD

研究了隐式ＡＦ有限差分理论。指出薄层抛物化控制方程中的右端粘性项是主元素变量矢的一个简单线性函数。给出了任意边界扩压器内紊流流动的数值计算结果，并和实验数据进行了对照。两者吻合得相当好。研究结果对ＡＦ有限差分理论以及推广至三维复杂管道内的非定常流动计算具有重要的参考意义。

This paper gives some investigation on the theory of implicit approximate factorized finite difference firstly. The results show that the viscous Right-Hand-Side vector is a simple linearfunction 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 byuse of implicit AF method.Studies show that the computational results are fairly in agreement withthe experimental data, which will provide the base for the relevant aircraft design and further studyon three dimensional unsteady turbulent flows.