Abstract
A supersonic axisymmetric jet of design Mach number 1.3 operated in perfectly- and imperfectly-expanded flow regimes is excited by using localized arc filament plasma actuators (LAFPAs). The jet is operated at three fully-expanded jet Mach numbers (MJ) of 1.2 (over-expanded), 1.3 (perfectly-expanded), and 1.4 (under-expanded). The Reynolds number based on the jet diameter and jet exit velocity ranges from 1.1×106 to 1.4×106. Eight equally-spaced LAFPAs are housed in a boron nitride nozzle extension. The forcing Strouhal number is ranged from 0.07 to 2.62 for azimuthal modes of 0-3, ±1, ±2, and ±4. In the perfectly-expanded jet, the most effective forcing is obtained at m = ±1 and the jet spreading is significantly enhanced at a forcing Strouhal number of about 0.3 at this mode. For the perfectly-expanded jet, the effects of forcing on the jet development and structure formation are very similar to those observed in a MJ = 0.9 subsonic jet, which has been investigated previously. However, the generated str...
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