N supersonic combustion chambers, fast mixing of fuel and air is essential for a stable self ignition, good combustion performance, and low NOx emissions. Different types of injectors have been investigated. The most commonly used concepts are wall1-8 and strut injectors9-16. In this paper, a strut injector concept is investigated. Struts offer the possibility to inject the fuel directly into the main stream coming from inlet and isolator. Moreover, streamwise vorticity may be created by a favorably chosen strut geometry in order to enhance the mixing of fuel and air17. Due to the axial fuel injection losses in total pressure are relatively low, momentum is added in fuel direction, and combustion takes place in the core of the combustor, away from solid walls. Normal shock waves (as in case of wall injection) are avoided. On the other hand, the last point may cause problems for self ignition and flame stabilization. Both lifted and attached flames may occur in case of strut injectors15.