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It was recently demonstrated by direct experiment in subsonic jets that an instability wave in jet shear layer generated by pure-tone acoustic excitation could be suppressed by another acoustic excitation, which generates an instability wave with the same properties. It was suggested that instability waves could be generated by any oscillating field near the nozzle exit. This paper presents the results of experimental investigations of instability wave suppression by other types of periodic excitation. Three types of plasma actuators are considered: (i ) high-frequency (HF) dielectric barrier discharge (DBD); (ii ) slipping discharge; and (iii ) corona discharge. Control authority of the plasma actuators over instability waves is demonstrated. For high-speed hot jets where instability waves are the dominant noise source, instability wave control is equivalent to noise control.

Instability wave control in turbulent jet by acoustical and plasma actuators