Experimental Investigation of the Acoustic and Fluid Dynamic Characteristics of a Circulation-Controlled Airfoil. Final Report March 30, 2007-April 30, 2011

摘要

The purpose of this investigation is to experimentally identify and characterize the flow field and corresponding noise sources of a circulation control airfoil. Flow and acoustic data are obtained for a dual-slotted, elliptic circulation control airfoil in an anechoic wind tunnel. The effect of single-slot blowing on the aerodynamic characteristics of the airfoil and the flow field is evaluated. Noise sources are identified for a variety of test conditions, and the acoustic data are compared with an existing analytical model of circulation control acoustics. An accurate acoustic model combined with specific information about each noise source mechanism will provide future researchers with the tools necessary to intuitively design and test quiet circulation control appendages for use on underwater vehicles.