DGLR/AIAA 14th Aeroacoustics Conference: May 11-14, 1992, Eurogress Center Aachen, Federal Republic of Germany, Proceedings, Volume 1
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General and Technical CoChairmen of
by Dr Heinrich Freiherr von Lersner
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acoustic field acoustic waves aeroacoustic aerodynamic AIAA aircraft airfoil amplitude analysis angle asymptotic axial blade boundary conditions Boundary Element Methods boundary layer calculated coefficient components computational contour convection density DGLR/AIAA downstream duct effects element equation excitation experimental Figure finite flap flow field fluid frequency function fuselage grid inflow instability waves integral interaction leading edge lift force linear Mach number Mach wave mean flow measured method microphone modal modes NASA noise reduction nonlinear nozzle obtained panel peak phase plane plate predicted pressure fluctuations problem propagation propeller propfan quadrupole radiation reduced region schlieren shear layer shown in Fig shows simulation solution sound field sound power sound power level sound pressure levels spectra speed Strouhal structure supersonic surface tail rotor test section tion trailing edge turbulent unsteady values velocity vibration vortex vortex ring vorticity wake wavenumber wind tunnel