Numerical Simulation of Subsonic Diffuser for Supersonic Air-Intake (Effects of Blowing on Diffuser Performance)

摘要

The effects of tangential blowing on the performance of subsonic diffuser for supersonic air- intakes are numerically investigated in order to develop a high performance subsonic diffuser with short length. Using a k-εturbulence model, numerical simulation is performed on five types of diffuser configurations with and without tangential blowing. The results show that our calculation reproduces the qualitative features of the flow, and remarkable improvement of diffuser performance can be achieved by tangential blowing into the separation region. Moreover, it is suggested that tuning a model constant has possibility to predict the flow more reasonably.