Turbulent drag reduction using wall jets at flight scale Reynolds number

Abstract

Numerical experiments have been performed for modelling turbulent drag reduction due to active-control of wall jets using a linearised Navier-Stokes model in a turbulent boundary layer formed over a flat plate at Re _τ = 905 corresponding to flight scale Re_x = 10^6 . Its effect have been seen on transient growth of near-wall streaks and production of turbulent kinetic energy (TKE). Two sets, one corresponding to span wise slot and other corresponding to wall jets along the whole plate have been performed. Simulations are performed by varying magnitude of wall jets, its angle & locations and based on a measure of TKE, reduction in stream wise turbulent kinetic energy is recorded.