Effects of simulated flight on the structure and noise of underexpanded jets
Thomas D. Norum, John G. Shearin, United States. National Aeronautics and Space Administration. Scientific and Technical Information Branch
National Aeronautics and Space Administration, Scientific and Technical Information Branch, 1984 - Science - 29 pages
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11 shock cells Aerotrain AIAA Paper axial locations broadband noise broadband shock noise centerline static pressures component of shock-associated computed convection Mach number Derived from eq dominant screech mode downstream shock cells effect of flight equation external flow figure 19 flight condition Flight Simulation flight speed flow disturbance forward speed free jet velocities fully expanded model fundamental screech tone given in figure increase jet axis jet centerline jet mixing noise jet stagnation pressure Langley Research Center lip line measured wavelength microphone arc NASA nozzle pressure ratios number of shock OASPL peak broadband shock predicted Ps/Pa radial screech mode change screech wavelengths seen in figure shock cell length shock cell spacing shock strengths shock-free jets shown in figure simulated flight sound pressure level sound speed sound wave spectra static and flight static and pitot static condition subsonic supersonic jet noise traverses underexpanded jet upstream axis wavelength of fundamental