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  • Title: Aeroacoustic sound generation in simple expansion chambers.
    Author: English EJ, Holland KR.
    Journal: J Acoust Soc Am; 2010 Nov; 128(5):2589-95. PubMed ID: 21110557.
    Abstract:
    A method is presented for measuring the aeroacoustic source strength in ducts with flow at frequencies at which the wave motion can be considered substantially one-dimensional. The method is based on coherent power flux measurements using pairs of microphones positioned both upstream and downstream of the source region. The method is applied to a flow excited expansion chamber with aeroacoustic source measurements presented for chambers with a range of flow velocities and chamber lengths. The results indicate locked-on flow tones are generated in the chamber. The frequency of these locked-on flow tones is compared with that predicted using describing function theory applied to resonators with a grazing flow as well as that of other literature.
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