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 amplitude annular duct area-weighted azimuthal Bessel function CLOSE(9 cm diameter conical cm diameter duct cm diameter straight computed CONTINUE daisy lobe nozzle derived diameter conical nozzle diameter straight duct 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 induct measurements input signals jet Mach numbers KHz Figure Lockheed-Georgia Company mean flow microphone modal decomposition MODAL POWER nozzle at various nozzle geometry nozzle transfer function number of averages output signal plane wave polar angles power loss pressure level spectrum probe propagation radial variation reference conical nozzle reflected power reflected pressure field reflection coefficient spectra shown in figure signal averaging signal synthesis signal-to-noise ratio sound pressure level source section spark discharge subroutine suppressor nozzle transmission transmitted power vortex ring WRITE WRITE WRITE