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

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

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

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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.
Original languageEnglish
Title of host publication28th AIAA/CEAS Aeroacoustics 2022 Conference
Number of pages8
ISBN (Electronic)978-1-62410-664-4
DOIs
Publication statusPublished - 2022
Event28th AIAA/CEAS Aeroacoustics 2022 Conference - Southampton, United Kingdom
Duration: 14 Jun 202217 Jun 2022
Conference number: 28

Publication series

Name28th AIAA/CEAS Aeroacoustics Conference, 2022

Conference

Conference28th AIAA/CEAS Aeroacoustics 2022 Conference
Country/TerritoryUnited Kingdom
CitySouthampton
Period14/06/2217/06/22

Bibliographical note

Correction Notice
§III¶4: The phrase “Since injection takes only a short time, the variation in total mass-flow through the convergent injection nozzle is negligible compared with 𝑚¤ inj,” is incorrect. In its stead one should substitute the following sentece: “Since injection takes only a short time, the variation in total mass-flow
through the convergent-divergent nozzle is negligible compared with 𝑚¤ inj.”

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