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

L. Hirschberg, F. Bake, Karsten Knobloch, S.J. Hulshoff

Research output: Chapter in Book/Conference proceedings/Edited volumeConference contributionScientificpeer-review

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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.
Original languageEnglish
Title of host publicationAIAA AVIATION 2021 FORUM
Number of pages11
ISBN (Electronic) 978-1-62410-610-1
DOIs
Publication statusPublished - 2021
EventAIAA Aviation 2021 Forum - Virtual Event
Duration: 2 Aug 20216 Aug 2021

Conference

ConferenceAIAA Aviation 2021 Forum
Period2/08/216/08/21

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