Swirl-Nozzle Interaction Experiments

Influence of Injection-Reservoir Pressure and Injection Time

Conference paper (2021)

Authors

L. Hirschberg Aerodynamics - Aerospace Engineering , Deutsches Zentrum für Luft- und Raumfahrt e.V. (DLR)
F. Bake Deutsches Zentrum für Luft- und Raumfahrt e.V. (DLR)
Karsten Knobloch Deutsches Zentrum für Luft- und Raumfahrt e.V. (DLR)
S.J. Hulshoff Aerodynamics - Aerospace Engineering
Research Group
Aerodynamics (Aerospace Engineering) (TU Delft)
Copyright: © 2021 L. Hirschberg, F. Bake, Karsten Knobloch, S.J. Hulshoff
DOI: https://doi.org/10.2514/6.2021-2286
More Info
expand_more

Published Date

2021

Language

English

Reuse Rights

Other than for strictly personal use, it is not permitted to download, forward or distribute the text or part of it, without the consent of the author(s) and/or copyright holder(s), unless the work is under an open content license such as Creative Commons.

Faculty

Aerospace Engineering

Department

Flow Physics and Technology

Research Group

Aerodynamics

Abstract

View Video Presentation: https://doi-org.tudelft.idm.oclc.org/10.2514/6.2021-2286.vid

Quantitative measurements of sound due to swirl-nozzle interaction are presented for the first time. In the experiment a swirl structure was generated by means of tangential injection into a steady swirl-free flow upstream from a choked convergent-divergent nozzle. Ingestion of swirl by the choked nozzle caused a mass-flow rate change, which resulted in a downstream measured acoustic response. The amplitude of this acoustic response was found to be proportional to the square of the tangential mass-flow rate used to generate swirl. This was, assuming that the upstream generated swirl intensity is proportional to the tangential injection mass-flow rate, predicted by a previously published quasi-steady model for the swirl-nozzle interaction sound source (Hirschberg, L., Hulshoff, S. J., and Bake, F., “Sound Production due to Swirl-Nozzle Interaction: Model-Based Analysis of Experiments,” AIAA Journal, Published online on Nov. 11th 2020, doi: 10.2514/1.J059669.). The tangential-injection time was varied, and found to not influence the amplitude of the acoustic response. This indicates that quasi-steady modelling remains applicable, even for smallest achievable upstream swirl structure with an axial length of ca. three upstream diameters.

Files

6.2021_2286.pdf
(.pdf | 0.693 Mb)