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

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

doi:10.2514/6.2022-3055

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

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

Aerodynamics

Research output: Chapter in Book/Conference proceedings/Edited volume › Conference contribution › Scientific › peer-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 language	English
Title of host publication	28th AIAA/CEAS Aeroacoustics 2022 Conference
Number of pages	8
ISBN (Electronic)	978-1-62410-664-4
DOIs	https://doi.org/10.2514/6.2022-3055
Publication status	Published - 2022
Event	28th AIAA/CEAS Aeroacoustics 2022 Conference - Southampton, United Kingdom Duration: 14 Jun 2022 → 17 Jun 2022 Conference number: 28

Publication series

Name	28th AIAA/CEAS Aeroacoustics Conference, 2022

Conference

Conference	28th AIAA/CEAS Aeroacoustics 2022 Conference
Country/Territory	United Kingdom
City	Southampton
Period	14/06/22 → 17/06/22

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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Cite this

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

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.",

author = "L. Hirschberg and F. Bake and S.J. Hulshoff",

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.”; 28th AIAA/CEAS Aeroacoustics 2022 Conference ; Conference date: 14-06-2022 Through 17-06-2022",

year = "2022",

doi = "10.2514/6.2022-3055",

language = "English",

series = "28th AIAA/CEAS Aeroacoustics Conference, 2022",

booktitle = "28th AIAA/CEAS Aeroacoustics 2022 Conference",

}

Hirschberg, L, Bake, F & Hulshoff, SJ 2022, Sound production due to main-flow oriented vorticity-nozzle interaction in absence of a net swirl. in 28th AIAA/CEAS Aeroacoustics 2022 Conference., AIAA 2022-3055, 28th AIAA/CEAS Aeroacoustics Conference, 2022, 28th AIAA/CEAS Aeroacoustics 2022 Conference, Southampton, United Kingdom, 14/06/22. https://doi.org/10.2514/6.2022-3055

Sound production due to main-flow oriented vorticity-nozzle interaction in absence of a net swirl. / Hirschberg, L.; Bake, F.; Hulshoff, S.J.
28th AIAA/CEAS Aeroacoustics 2022 Conference. 2022. AIAA 2022-3055 (28th AIAA/CEAS Aeroacoustics Conference, 2022).

Research output: Chapter in Book/Conference proceedings/Edited volume › Conference contribution › Scientific › peer-review

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N1 - Conference code: 28

PY - 2022

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N2 - 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.

AB - 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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M3 - Conference contribution

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Y2 - 14 June 2022 through 17 June 2022

ER -

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

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