Parametric effects in a scramjet engine on the interaction between the air stream and the injection

摘要

The mixing of fuel and air in supersonic flow plays a significant role in the enhancement of the performance of scramjet engines. In this article, the two-dimensional coupled implicit Reynolds-averaged Navier-Stokes equations and the standard k-ε turbulent model are introduced to investigate the interaction between the supersonic air flow and the helium stream injected into a typical scramjet engine. A range of different angles (30-150°) of both the incoming air stream and the helium injection under various pressure conditions (0.62-1.86 MPa) have been investigated to assess their impact on the mixing. It is shown among the cases studied for different helium injections that an angle of 90° produces the highest mixing efficiency. In the cases with a variable air stream angle, then the situation with a 30° air stream angle can achieve a higher mixing efficiency than other angles. In addition, with a higher pressure of the injection, the air stream and the helium mix better.