In an aspect, a method is provided for attenuating jet engine noise. Air
velocity, adjacent to an inlet fan duct outer wall, is increased to a
greater rate than typical velocity of an operational engine ambient inlet
airflow, adjacent to the inlet fan duct outer wall. Boundary layer and
associated turbulence is reduced or eliminated. Refraction and absorption
of inlet sound into an acoustic liner is optimized. In an aspect, air
velocity is increased by injecting air. In an aspect, air velocity is
increased by exerting a suction force. In an aspect, a system is provided
to attenuate jet engine noise. In an aspect, a fluid duct is provided
opening to an inlet fan duct outer wall and to aft of a fan rotor.