Abstract
Twin supersonic jet plumes have been known to couple, their oscillatory motion creating a strong interaction with the acoustic field. It is also well known that a supersonic flow impinging on a solid surface will produce strong discrete tones. In this paper we attempt to describe the relationship and response of the two phenomena in a twin supersonic impinging jet. Acoustic measurements and schlieren visualisations are presented for an underexpanded flow. A wide range of nozzle pressure ratios (NPR), plate height (z/D) and nozzle spacings were investigated in a large parametric study. Relationships between the acoustic data and schlieren visualisations indicate differences in the aeroacoustic mechanisms as compared to single impinging jets. The use of an ultra high-speed camera shows the coupling between two jets are suppressed for small stand-off distances (z/D 3.5). The results presented sheds light on a complex phenomena which is applicable in V/STOL aircrafts.
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