三维超声速隔离段湍流内流场旋涡结构的数值模拟

Numerical Simulation of 3D Turbulent Vortex Structures in Isolator

从基于雷诺平均的N S方程出发 ,采用有限体积方法离散控制方程 ,数值模拟了三维超声速隔离段湍流内流场。计算中采用了二阶OC TVD差分格式、LU隐式算法和Baldwin Lomax代数湍流模型。数值结果与实验做了对比 ,并结合隔离段中的激波串结构分析了其横截面上旋涡结构的发展过程及不同外形条件下旋涡的不同结构。计算结果表明采用本文发展的方法模拟隔离段湍流流场是可行的 。

The interaction between shock waves and boundary layer in isolator causes a very complicated flow, to simulate the turbulent flow field in it, the time dependent, implicit, finite volume, lower upper numerical method was used to solve the 3D compressible Reynolds averaged Navier Stokes equations. Numerical results are compared with experimental data and used to describe the vortex structures in different isolator shape or different location of an isolator combined shock train structures in it. The numerical results indicate that the vortex structures in square cross section and rectangular cross section is very different.