Sound production due to main-flow oriented vorticity-nozzle interaction in absence of a net swirl

Conference paper (2022)

Authors

L. Hirschberg Imperial College London
F. Bake Bundesanstalt für Materialforschung und -prüfung (BAM)
S.J. Hulshoff Aerodynamics - Aerospace Engineering
Research Group
Aerodynamics (Aerospace Engineering) (TU Delft)
Copyright: © 2022 L. Hirschberg, F. Bake, S.J. Hulshoff
DOI: https://doi.org/10.2514/6.2022-3055
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Published Date

2022

Language

English

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Faculty

Aerospace Engineering

Department

Flow Physics and Technology

Research Group

Aerodynamics

Abstract

The downstream acoustic response due to the interaction of main-flow oriented vorticity with a choked nozzle in a swirl-free flow was experimentally demonstrated. The response was obtained by means of impulsive radial air injection in the pipe upstream from the nozzle. The resulting downstream acoustic data are shown to obey a scaling rule that differs, from the one for swirl-nozzle interaction, which according to the literature is proportional to the square of the swirl number. In contrast, here evidence is presented that points to the scaling of main-flow oriented vorticity noise with the cross-sectional average of the square of the transversal velocity at the throat divided by the square of the critical sound speed.

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