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 acoustic pressure Aerotrain AIAA Paper anechoic chamber axial locations broadband noise broadband shock noise Centerline static pressure computed 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 i i i i I i i i i increase jet axis jet centerline jet mixing noise jet stagnation pressure Langley Research Center measured wavelength microphone arc NASA nozzle pressure ratios OASPL peak broadband shock predicted PS/pa radial screech wavelengths seen in figure seven shock cells shadowgraph shock cell length Shock cell strengths shock strengths shock-associated noise shock-free jets shown in figure simulated flight sound pressure level sound wave spectra static and flight static and pitot static pressure distribution supersonic jet noise underexpanded jet upstream axis wavelength of fundamental