In this paper we will present some of the more fundamental notions of the phenomena classified as “subsonic aerodynamic noise.” In light of these, we wish to discuss the mechanisms of noise generation responsible for the self-noise of sound-trap[s, dampers, diffusers and other duct-located flow discontinuities. Furthermore, we will suggest, on the basis of some recent experimental studies, that the intensity and frequency spectrum of self-noise in ventilation systems can be predicted in a general sense. Tentative formulae are presented to this effect. Finally, recommendations are presented for future work in this area.
Gordon, C. G., “The Problem of Duct-Generated Noise and its Prediction,” presented at ASHRAE Semiannual Meeting, Columbus, OH, February 5-8, 1968.6a1288d5e872b4436ba6db9aee9d9a20