Comparative analysis of acoustic and flow characteristics in co-axial flat and curved vane swirl jets

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Experimental study compares acoustic performance of flat and curved vane configurations, indicating significant noise reduction potential.

Flat vanes achieved greater noise reduction, reaching 11–15 dB at higher nozzle pressure ratios, improving jet performance significantly.
Experimental analysis determined swirl jets eliminated screech tones and reduced shock cell lengths notably from x/D = 9 to x/D = 4.
Measurements included far-field acoustic assessments and flow visualization across varied vane angles and nozzle pressure ratios.
Findings guide the optimization of swirl jet designs in propulsion and mixing systems, highlighting future research in thrust impacts.

Balakrishnan et al. (2025) studied this question.

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Experimental study compares acoustic performance of flat and curved vane configurations, indicating significant noise reduction potential.