The Effects of the Jet-Flow on Sound Propagation in Low-Speed Wind Tunnel
Based on the open-jet aero-acoustic wind tunnel, an experimental study was made to research the effects of the jet-flow on sound propagation. This study is focused on the changes of the direction of the sound propagation, the changes of the sound pressure level, the phenomenon of tone broadening and the availability of the existing prediction method for sound propagation in jet-flow. The results indicate that the influence of the jet-flow on the value of the noise source shift varies along the direction of the jet-flow and there is no regular influence on the sound pressure level. In addition, the flow around the test sample has affected the sound propagation, and the phenomenon of tone broadening exists when high frequency signal is used. The study also reveals the limitation of the application of the existing prediction method, because the model it used is too simple.
Chunliang Zhang and Paul P. Lin
Y. G. Wang et al., "The Effects of the Jet-Flow on Sound Propagation in Low-Speed Wind Tunnel", Applied Mechanics and Materials, Vols. 226-228, pp. 368-373, 2012