An Experimental Investigation of the Acoustic Characteristics of a Variety of Slot Baffle Configurations for Transonic Wind Tunnel Walls.

摘要

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 NASA/Ames 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. (Author)