On Gasdynamics Instabilities Supported by Non-Equilibrium Plasma in a Supersonic Flow

摘要

The receptivity of laminar compressible flows over a flat plat is studied by linear stability analysis following an adjoint operator approach. Compressibility and Reynolds number are shown to significantly affect the adjoint fields and herewith the flow response to volumetric perturbation sources located close to the plate edge. The source terms, approximated by analytical profiles, are selected to account for momentum and heat distributions generated by Dielectric Barrier Discharge (DBD) actuators that are of interest for flow control applications. Variations of the homogeneous flow conditions, forcing and system length scales provide new insights as to how the excitation type, geometry and placement affect the amount of energy deposited into Tollmien-Schlichting waves depending on mean-stream parameters.