Computation of supersonic jet mixing noise for an axisymmetric convergent-divergent nozzle

摘要: The turbulent mixing noise of a supersonic jet is calculated for an axisymmetric convergent-divergent nozzle at the design pressure ratio. Aerodynamic computations are performed using PARC code with k-e turbulence model. LighthiU's acoustic analogy adopted. acoustics solution based upon methodology followed in MGB code. source correlation function expressed as linear combination second-order tensors (Ribner's assumption). Assuming separable correlations and incorporating Batchelor's isotropic model, term was from kinetic energy turbulence. A Gaussian distribution time-delay introduced. CFD used to obtain strength well characteristic correlation. effect sound/flow interaction incorporated high frequency asymptotic Lilley's equation geometries. Acoustic results include sound level directivity spectra different polar angles. aerodynamic demonstrate favorable agreement experimental data.