Abstract
The development of an anechoic wind tunnel is presented. The test section walls of a low-speed open-circuit wind tunnel have been acoustically treated in order to simulate an acoustically free field environment with forward flight. The dimensions of the test section are 0.86 m wide by 0.56 m tall and 1.32 m long. The four walls of the test section are lined with pretensioned Kevlar panels that permit the transmission of sound with less than 2 dB of attenuation. The top and bottom walls of the test section sandwich 4-in. thick acoustic foam between the pretensioned Kevlar and a wooden frame. The side walls of the test section consists of pretensioned Kevlar screens that separate the test section flow from adjacent anechoic chambers. In this fashion, the acoustic measuring equipment is not subjected to the flow inside the test section. Noise sources are modeled with a small loudspeaker that is connected to a signal generator and acoustic measurements are taken with quarter-inch condenser microphones. Prelim...
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