Development of disturbances generated by an electric discharge in the zone of a shock wave interacting with a boundary layer
O.I. Vishnyakov, P.A. Polivanov, A.A. Sidorenko, A.D. Budovsky
Khristianovich Institute of Theoretical and Applied Mechanics SB RAS, Novosibirsk, Russia
Keywords: shock wave/boundary layer interaction, flow separation, electric discharge
Abstract
The paper presents the results of experimental study of disturbances generated by an electric discharge. Tthe disturbances occur in the zone of interaction of a shock wave and a boundary layer (the income shock wave has the Mach number М = 1.43). Experiments were carried out in a supersonic wind tunnel with the unit Reynolds number Re1 = 11×106 1/m. The flow velocity was measured using the PIV method and hot wire method. The artificial disturbances are generated by a periodic pulsed electric charge; the charge facility is allocated at the model surface upstream the interaction zone. The discharge time is less than 100 ns: this enables creating a wide-spectrum disturbance inside the boundary layer. The method of phase-synchronous measurement with the ensemble averaging for realization produces the spatial and temporal characteristics of disturbances generated in the interaction zone. The major growth of initial disturbances occurs in the shear layer behind the shock wave/boundary layer interaction zone (here the flow is turbulent).
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