Accession Number : ADA392779


Title :   Effective Actuation: High Bandwidth Actuators and Actuator Scaling Laws


Descriptive Note : Final rept. 1 Sep 2000-30 Aug 2001 on Phase 1


Corporate Author : INNOVATIVE TECHNOLOGY APPLICATIONS CHESTERFIELD MO


Personal Author(s) : Cain, A. B. ; Raman, G. R. ; Kerschen, E. J.


Full Text : http://www.dtic.mil/get-tr-doc/pdf?AD=ADA392779


Report Date : 16 JUL 2001


Pagination or Media Count : 89


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.


Descriptors :   *ACTUATORS , *JET FLOW , *ACOUSTIC RESONANCE , HIGH FREQUENCY , EXCITATION , ACOUSTICS , TUBES.


Subject Categories : NUMERICAL MATHEMATICS
      ACOUSTICS
      FLUID MECHANICS


Distribution Statement : APPROVED FOR PUBLIC RELEASE