Refinement and application of acoustic impulse technique to study nozzle transmission characteristics
M. Salikuddin, United States. National Aeronautics and Space Administration. Scientific and Technical Information Branch, Lewis Research Center, Lockheed-Georgia Company
National Aeronautics and Space Administration, Scientific and Technical Information Branch, 1983 - Technology & Engineering - 398 pages
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6.2 cm diameter acoustic driver acoustic impulse technique acoustic intensity acoustic power amplitude annular duct area-weighted azimuthal Bessel function CLOSE(9 cm diameter conical cm diameter duct computed CONTINUE daisy lobe nozzle diameter conical nozzle driver system Effect of nozzle equation evaluated experimental far-field power flow conditions flow Mach numbers free jet Mach higher order modes impedance tube incident power jet Mach number KHz Figure mean flow modal decomposition MODAL POWER nozzle at various nozzle geometry nozzle transfer function number of averages output signal plane wave polar angles power imbalance power loss power spectra pressure level spectra probe propagation radial locations radial variation reference conical nozzle reflected power reflected pressure field reflected sound pressure reflection coefficient spectra shown in figure signal averaging signal synthesis signal-to-noise ratio sound field sound pressure level source section spark discharge subroutine suppressor nozzle transmitted power values vortex ring