Author(s)

YANHUI JIA, ZIXUE GUO

Abstract

To investigate the variation regularity of refined flowing structure and flowing parameters of the working gas in pipe with varying cross-section, we numerically simulate the inner flow in the pipe using AUSM-up spatial model and LU-SGS implicit timing model, and study the influence of the Mach number on the flowing parameters. The conclusions are as follows: the structure of the inner flow is rather complicated that includes both shock wave and rarefaction wave, and there exists the overlapping phenomenon of the shock wave and the rarefaction wave, as well as the reflection of the rarefaction wave on the inner pipe wall. As the Mach number increases, the pressure at the outlet decreases whereas the temperature at the outlet ascends continuously.

Keywords

AUSM model, LU-SGS model, varying cross-section, inner flow field, numerical simulation