A series of experiments was described in which flow control was used to improve the performance of aeropropulsion systems. In the first experiment, trailing edge blowing (TEB) in upstream stator is used to reduce wake distortion seen by the downstream rotor and the associated tonal noise. The experiment, which was conducted in an anechoic chamber using a smallscale 4 inch-diameter turbofan simulator, showed that blade-passing-frequency (BPF) tone can be reduced by as much as 8 dB. Sensing and control strategies were also employed to obtain the optimal system performance for transient (off-design) condition. The second experiment is related to the first one in that TEB is employed in upstream stator to reduce wake distortion to the rotor in order to reduce high-cycle fatigue of the rotor. The experiment, which was conducted in a 20 inch-diameter transonic fan rotor instrumented with on-rotor strain gauges, showed that average peak-to-peak rotor strain amplitude was reduced by more that a factor of three. In the third experiment, suction and blowing flow control was used to reduce aerodynamic losses and improve flow uniformity in an S-shape aircraft inlet. An investigation was performed to use surface mounted microphones as error sensors to actively optimize system performance.