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Swirl-Nozzle Interaction Experiments: Influence of Injection-Reservoir Pressure and Injection Time

Hirschberg, Lionel and Bake, Friedrich and Knobloch, Karsten and Hulshoff, Steven J. (2021) Swirl-Nozzle Interaction Experiments: Influence of Injection-Reservoir Pressure and Injection Time. In: 27th AIAA/CEAS Aeroacoustics Conference / AIAA AVIATION 2021 FORUM. 27th AIAA/CEAS Aeroacoustics Conference / AIAA AVIATION 2021 FORUM, 02. -06. August 2021, Virtual Event. doi: 10.2514/6.2021-2286.

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Official URL: https://doi.org/10.2514/6.2021-2286

Abstract

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 SwirlNozzle 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.

Item URL in elib:https://elib.dlr.de/143475/
Document Type:Conference or Workshop Item (Speech)
Title:Swirl-Nozzle Interaction Experiments: Influence of Injection-Reservoir Pressure and Injection Time
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Hirschberg, LionelLionel.Hirschberg (at) dlr.deUNSPECIFIED
Bake, FriedrichFriedrich.Bake (at) dlr.dehttps://orcid.org/0000-0002-3235-428X
Knobloch, KarstenKarsten.Knobloch (at) dlr.dehttps://orcid.org/0000-0002-3424-0809
Hulshoff, Steven J.S.J.Hulshoff (at) TUDelft.NLUNSPECIFIED
Date:August 2021
Journal or Publication Title:27th AIAA/CEAS Aeroacoustics Conference / AIAA AVIATION 2021 FORUM
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
DOI :10.2514/6.2021-2286
Status:Published
Keywords:Core Noise, Combustion Noise, Vortex Noise, Swirl-Nozzle-Interaction, Indirect Combustion Noise
Event Title:27th AIAA/CEAS Aeroacoustics Conference / AIAA AVIATION 2021 FORUM
Event Location:Virtual Event
Event Type:international Conference
Event Dates:02. -06. August 2021
Organizer:AIAA / CEAS
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:Clean Propulsion
DLR - Research area:Aeronautics
DLR - Program:L CP - Clean Propulsion
DLR - Research theme (Project):L - Components and Emissions
Location: Berlin-Charlottenburg
Institutes and Institutions:Institute of Propulsion Technology > Engine Acoustic
Deposited By: Bake, Dr.-Ing. Friedrich
Deposited On:19 Aug 2021 07:51
Last Modified:19 Aug 2021 07:51

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