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- W2035988685 abstract "The radiation of sound from an asymmetrically lined duct is experimentally studied for various hard-walled standing mode sources. Measurements were made of the directivity of the radiated field and amplitude reflection coefficients in the hard-walled source section. These measurements are compared with baseline hard-wall and uniformly lined duct data. The dependence of these characteristics on mode number and angular location of the source is investigated. A comparison between previous theoretical calculations and the experimentally measured results is made and, in general, good agreement is obtained. For the several cases presented, an asymmetry in the liner impedance distribution was found to produce related asymmetries in the radiated acoustic field. a c / k krn kmn m, n p Pmn r R t x 6 Nomenclature duct radius, m speed of sound, m/s free wavenumber, w/c, m1 radial wavenumber, m ~ 1 axial wavenumber, k2mn = k2 — ( krn ) 2, m ~ 1 length of lined section, m mode number, (0,0) is plane wave acoustic pressure, N/m2 pressure amplitude, N/m2 radial cylindrical coordinate, m amplitude reflection coefficient, nondimensional time, s axial cylindrical coordinate, m angular cylindrical coordinate, rad $ = phase, deg l/ — radiation angle, deg w = frequency, rad/s" @default.
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- W2035988685 date "1984-06-01" @default.
- W2035988685 modified "2023-09-27" @default.
- W2035988685 title "Experiments on Sound Radiation from a Duct with a Circumferentially Varying Liner" @default.
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- W2035988685 doi "https://doi.org/10.2514/3.48518" @default.
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