Interaction between an Upstream Facing Wall Jet and a Supersonic Stream

T interaction of an upstream facing wall jet with a supersonic counterflowing stream gives rise to a complex flowfield. The description of this flowfield is interesting for the general understanding of complex interaction problems and for possible engineering applications. The injected gas penetrates upstream and then reverses interacting with the main-stream flow. A high mixing rate between the two counterflowing streams is characteristic of this flowfield. Depending on the issuing jet conditions, different degrees of penetration and interaction can take place with correspondingly greatly diverse flowfield structures. The purpose of the present study has been to obtain a qualitative and quantitative description of the flowfield generated by the two interacting streams; in particular to determine the main parameters governing the flowfield and their influence on the penetration and the interaction phenomena.