Abstract : The project advances active flow control to enable new Air Force capabilities. Advances in both the development of new actuator hardware and in understanding the flow physics have been achieved. Four key new advances have been achieved in Phase I of this AFOSR/STTR Program. First, a new high power (125-160 dB), high bandwidth (factor of 8.6), high dynamic range (15-20 dB), computer automated actuator hardware system has been developed and demonstrated. Second, the first simulations of the powered resonance tube have been completed; these provide new insights into the details of the actuator flow physics. Third, a simplified analytical model of the powered resonance tube has been developed; this provides important design guidance and information on the effects of parametric variations. Finally, breakthrough computational simulations that advance our understanding of the effects of high frequency excitation on turbulent shear layers have been completed. These simulations show that the high frequency excitation reduces turbulent production rate and increases the turbulent dissipation rate to dramatically reduce the turbulent kinetic energy.