求解可压缩N－S方程的无粘－粘性分数步法

IRVISCOUS-VISCOUS FRACTIONAL METHOD TO SOLVE N-S EQUATIAN SET FOR COMPRESSIBLE FLUID

关键词:  发动机喷管  喷管气流  流动分布  数值模拟

Key words:  Engine nozzle  Nozzle gas flow  Flow distribution  Numerical simulation

摘要:

用按物理过程作时间分裂的无粘－粘性分数步法求解可压缩Ｎ－Ｓ方程，无粘步用高效欧拉算法解欧拉方程，粘性步用全隐格式解抛物方程；并采取了有效措施消除由分步法产生的时间和空间不相容性，文中给出了轴对称喷管内外流场的数值模拟结果。

Abstract:

n insteady compressible N-S equation set is solved with irviscous-viscous fractional method which splits the equations according to its physical process. In the irviscous-step, the Euler equations is solved with Efficient Euler Solver, and in the viscous-step the parabolic equation is solved with a whole implicit scheme. In order to remove both temporal and spatial inconsistencies resulted from the fractional, some efficent measure is taken. Simulated flow fields of inside and outside an axial symmetry nozzle are given by using irviscous-viscous fractional method.