An experimental study of jet noise part II: Shock associated noise

摘要: Abstract The characteristics of the sound field shock-containing under-expanded jet flows are studied by measuring noise from a convergent nozzle operated over an extensive envelope supercritical operating conditions. measurements were conducted in anechoic facility. They complementary to turbulent mixing experiments (described Part I) for subsonic and fully-expanded (shock-free) supersonic jets. overall results jets compared directly with corresponding shock-free jets, effects pressure ratio exhaust temperature on broadband shock-associated assessed independently. For jet, regimes conditions, observer angles, frequencies which is dominated identified. Finally, spectral preliminary manner spectra predicted existing theoretical model, good agreement obtained most cases.