EFFECTS OF TEMPERATURE ON THE NEAR-NOZZLE ACOUSTIC TONES OF HIGH-SPEED JETS
Résumé
The effects of temperature on the acoustic tones emerging near the nozzle of high-speed round jets are investigated using large-eddy simulations. The jets have acoustic Mach numbers, corresponding to the ratios between the nozzle-exit velocities and the speed of sound in the ambient medium, between 0.30 and 1.30 and nozzle-exit temperatures equal to 1, 1.5 and 2.25 times the ambient temperature. For the hot jets, as for the isothermal jets, peaks emerge in the near-nozzle spectra, more or less strongly depending on the jet velocity. They do not appear to vary much with temperature at a fixed jet flow Mach number. Their frequencies and tonal characters can be explained by the properties of the guided jet waves predicted for a vortex sheet.
Domaines
Physique [physics]
Origine : Fichiers produits par l'(les) auteur(s)