Abstract
A jet-jet interaction technique using multiple supersonic fluidic injectors can reduce a shock cell length generated from a supersonic jet. In this study, the effects of the supersonic jet-jet interaction technique on an underexpanded jet impinging on a perpendicular plate was experimentally investigated under an atmospheric pressure. Four supersonic sub jets of Mach 1.5 interacted perpendicularly with a Mach 2.0 main flow at nozzle pressure ratio of 8.5, and the main flow impinged on several plate positions. Jet-jet interaction prevents the development of a central shock wave above the plate surface, which results in a maximum stagnation pressure decrease of 48% on the plate. Instead of the wall pressure decrease, the axial thrust of the main jet is decreased by jet-jet interaction; however, it is less than 6.1%. Jet-jet interaction causes a radial expanded main jet that prevents the flow fluctuation downstream of the jet-jet interaction area as well as in the vicinity of the plate surface because jet-jet interaction negates the oscillating shock cells. Hence, the jet-jet interaction technique is useful for various engineering applications that have issues due to the surface pressure increase and flow fluctuation.
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