关键词: 扩压器;湍流;数值计算

Abstract: 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.

Key words: diffuser;Turbulent flow;Numerical calculation