An Experimental Investigation of the Acoustic Characteristics of a Variety of Slot Baffle Configurations for Transonic Wind Tunnel Walls
Final rept. 1 Jul 1976-30 Sep 1977
ARNOLD ENGINEERING DEVELOPMENT CENTER ARNOLD AFB TN
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A parametric study of various slot baffle geometric configurations was performed in an effort to find an improvement to the acoustic characteristics of baffled slotted walls used in the NASAAmes Research Center transonic wind tunnels. The desired improvement was to reduce the aerodynamic noise generated by these walls. Parameters studied were baffle inclination angle, shape, and depth. A modification to wall samples which effectively suppressed the noise generated by the baffled slots was a fine-mesh wire screen overlay in combination with baffle inclination angle. The degree of tunnel was noise suppression achieved in the experiments was a factor of six less than the configuration now in use.
- Fluid Mechanics