Evaluation of the Acoustic and Aerodynamic Characteristics of Several Slot-Baffle Configurations for Transonic Wind Tunnel Walls

摘要

An experimental investigation was conducted to record the acoustic and aerodynamic performance of several slotted walls with transverse baffles in the slots for transonic test sections. Primary configuration variables were the baffle angle inclination relative to the airstream and a wire mesh screen on the airside wall surface. At all baffle angles, the addition of the screen overlay decreased the acoustic noise level and improved the flow generation and supersonic wave cancellation properties of the wall but increased the subsonic wall interference effects. (Author)