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- W2045542574 abstract "An experimental study of the acoustic pressure reflection coefficient at a sudden area expansion in a flowduct in regard to both magnitude and phase has been undertaken. The study was limited to low‐flow Mach numbers, frequencies supporting plane‐wave propagation, and an area transition ratio of 1:4. The magnitude of the coefficient is flow dependent and relatively insensitive to frequency while the phase is frequency dependent and relatively independent of flow. A semi‐empirical analytical model has been symthesized on the basis of available information that incorporates both frequency characteristics and flow affects through second order in the Mach number. The Karal discontinuity correction is important and appears to be a valid representation of the reactive acoustic fields at sufficiently low Mach numbers. The flow primarily influences the acoustic impedance level of both the upstream and downstream ducts and secondarily the acoustic pressure and velocity coupling parameters." @default.
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- W2045542574 date "1980-01-01" @default.
- W2045542574 modified "2023-09-26" @default.
- W2045542574 title "Acoustic synthesis of a flowduct area discontinuity" @default.
- W2045542574 cites W1998173478 @default.
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- W2045542574 doi "https://doi.org/10.1121/1.383789" @default.
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