Numerical Study on Acoustic Radiation from a Supersonic Jet Impinging to an Inclined Plate

Acoustics radiated from a M=1.8 ideally-expanded jet impinging on a 45 degree-inclined flat plate is investigated numerically with the help of the experimental work. Validation of computational method and grid convergence study are conducted firstly. Result of the free jet is satisfactory, while the present study overestimates the noise level of the impinging jet by 5 dB in OASPL. Based on the numerical technique validated here, mechanism of acoustics is analyzed. In addition to the well-known free-jet noise sources such as the Mach wave and the fine-scale turbulent mixing noise, additional two noise sources are found; 1) interaction between the shock waves and the vortex of the shear layer, 2) the Mach wave radiated from the jet flowing on the inclined plate. The former is similar to the shockassociated noise, and the OASPL plot at far-filed shows omni-directional feature. These two waves are also observed in the present experiment.

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