Publication de 6 numéros par an
ISSN Imprimer: 1948-2590
ISSN En ligne: 1948-2604
INVESTIGATION OF NOZZLE GEOMETRY AND OUTFLOW REGIME EFFECT ON FLOW PARAMETERS AND TURBULENT JET NOISE BY THE HIGH-RESOLUTION RANS/ILES METHOD
RÉSUMÉ
Joint flow simulations in conical, chevron, and biconical nozzles at subsonic and off-design supersonic jet outflow are carried out using the combined high-resolution Reynolds-averaged Navier–Stokes/implicit large-eddy simulation (RANS/ILES) method. Simulations are performed on grids of 2.8–4.5 × 106 cells. The temperature effects in the nozzle inlet on the flow in a jet, turbulence parameters, and noise are investigated. For all investigated jets, reasonable agreement of the simulations results with the experimental data for averaged flow and turbulence parameters is obtained. The effect of the nozzle geometry and the jet temperature on the static pressure and temperature fluctuations level in the jets is established. For subsonic jets, the integral noise level is in a good agreement with the experimental data. One-third octave spectra of the sound pressure acceptably coincides with the experimental results, depending on the nozzle type, jet temperature, and observation angle with numbers of Sh = 4–8. For off-design supersonic jets, satisfactory agreement with the simulations results from other studies on a fine grid by the integral noise level and narrowband spectrum is observed.