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 |
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| Title of host publication | 28th AIAA/CEAS Aeroacoustics 2022 Conference |
| Number of pages | 8 |
| ISBN (Electronic) | 978-1-62410-664-4 |
| DOIs | |
| 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 |
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Conference
| Conference | 28th AIAA/CEAS Aeroacoustics 2022 Conference |
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| 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.”