Experiment and numerical simulation for acoustics by unheated supersonic jet flow generated from a small-scale nozzle are performed. Linear and circular microphone arrays are employed for near-field noise and far-field noise, respectively. A peak radiation angle and peak average overall sound pressure level (OASPL) for far-field noise measured in experiment are validated by the previous studies. In the numerical simulation, delayed detached eddy simulation (DDES) is conducted for both near and far-field acoustic prediction. Helmholtz Kirchhoff integral method is employed for far-field noise prediction based on the results of computational fluid dynamics (CFD) simulation. Relatively accurate prediction is accomplished for the directional noise from the large turbulence structures. And discrepancies increase when it comes to omni-directional noise from the fine-scale turbulences.
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