Investigation of the physical mechanisms of tonal sound generation by slats

Anurag Agarwal; Philip J. Morris

doi:10.2514/6.2002-2575

Investigation of the physical mechanisms of tonal sound generation by slats

Anurag Agarwal, Philip J. Morris

Aerospace Engineering

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

13 Scopus citations

Abstract

The physical mechanisms for the occurrence of high-amplitude, high-frequency tonal noise generated by the flow through the gap between the slat and the main element during aircraft approach are explored using a detailed local stability analysis of the slat wake. Based on the physical characteristics of the wake, vortex shedding frequencies are predicted for different slat deployment angles. It is proposed that the observed tonal noise is due to a whistling mechanism. When the vortex shedding frequency at the slat trailing edge matches one of the transverse resonance frequencies of the gap between the slat and the main element, an intense, tonal sound field is produced. The predictions of tones and frequencies from the proposed whistling mechanism are in good agreement with experimental measurements.

Original language	English (US)
Title of host publication	8th AIAA/CEAS Aeroacoustics Conference and Exhibit
Publisher	American Institute of Aeronautics and Astronautics Inc.
ISBN (Print)	9781624101199
DOIs	https://doi.org/10.2514/6.2002-2575
State	Published - 2002
Event	8th AIAA/CEAS Aeroacoustics Conference and Exhibit, 2002 - Breckenridge, CO, United States Duration: Jun 17 2002 → Jun 19 2002

Publication series

Name	8th AIAA/CEAS Aeroacoustics Conference and Exhibit

Other

Other	8th AIAA/CEAS Aeroacoustics Conference and Exhibit, 2002
Country/Territory	United States
City	Breckenridge, CO
Period	6/17/02 → 6/19/02

All Science Journal Classification (ASJC) codes

Aerospace Engineering
Electrical and Electronic Engineering
Mechanical Engineering
Acoustics and Ultrasonics

Access to Document

10.2514/6.2002-2575

Cite this

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title = "Investigation of the physical mechanisms of tonal sound generation by slats",

abstract = "The physical mechanisms for the occurrence of high-amplitude, high-frequency tonal noise generated by the flow through the gap between the slat and the main element during aircraft approach are explored using a detailed local stability analysis of the slat wake. Based on the physical characteristics of the wake, vortex shedding frequencies are predicted for different slat deployment angles. It is proposed that the observed tonal noise is due to a whistling mechanism. When the vortex shedding frequency at the slat trailing edge matches one of the transverse resonance frequencies of the gap between the slat and the main element, an intense, tonal sound field is produced. The predictions of tones and frequencies from the proposed whistling mechanism are in good agreement with experimental measurements.",

author = "Anurag Agarwal and Morris, {Philip J.}",

year = "2002",

doi = "10.2514/6.2002-2575",

language = "English (US)",

isbn = "9781624101199",

series = "8th AIAA/CEAS Aeroacoustics Conference and Exhibit",

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Agarwal, A & Morris, PJ 2002, Investigation of the physical mechanisms of tonal sound generation by slats. in 8th AIAA/CEAS Aeroacoustics Conference and Exhibit. 8th AIAA/CEAS Aeroacoustics Conference and Exhibit, American Institute of Aeronautics and Astronautics Inc., 8th AIAA/CEAS Aeroacoustics Conference and Exhibit, 2002, Breckenridge, CO, United States, 6/17/02. https://doi.org/10.2514/6.2002-2575

Investigation of the physical mechanisms of tonal sound generation by slats. / Agarwal, Anurag; Morris, Philip J.
8th AIAA/CEAS Aeroacoustics Conference and Exhibit. American Institute of Aeronautics and Astronautics Inc., 2002. (8th AIAA/CEAS Aeroacoustics Conference and Exhibit).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

TY - GEN

T1 - Investigation of the physical mechanisms of tonal sound generation by slats

AU - Agarwal, Anurag

AU - Morris, Philip J.

PY - 2002

Y1 - 2002

N2 - The physical mechanisms for the occurrence of high-amplitude, high-frequency tonal noise generated by the flow through the gap between the slat and the main element during aircraft approach are explored using a detailed local stability analysis of the slat wake. Based on the physical characteristics of the wake, vortex shedding frequencies are predicted for different slat deployment angles. It is proposed that the observed tonal noise is due to a whistling mechanism. When the vortex shedding frequency at the slat trailing edge matches one of the transverse resonance frequencies of the gap between the slat and the main element, an intense, tonal sound field is produced. The predictions of tones and frequencies from the proposed whistling mechanism are in good agreement with experimental measurements.

AB - The physical mechanisms for the occurrence of high-amplitude, high-frequency tonal noise generated by the flow through the gap between the slat and the main element during aircraft approach are explored using a detailed local stability analysis of the slat wake. Based on the physical characteristics of the wake, vortex shedding frequencies are predicted for different slat deployment angles. It is proposed that the observed tonal noise is due to a whistling mechanism. When the vortex shedding frequency at the slat trailing edge matches one of the transverse resonance frequencies of the gap between the slat and the main element, an intense, tonal sound field is produced. The predictions of tones and frequencies from the proposed whistling mechanism are in good agreement with experimental measurements.

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M3 - Conference contribution

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T3 - 8th AIAA/CEAS Aeroacoustics Conference and Exhibit

BT - 8th AIAA/CEAS Aeroacoustics Conference and Exhibit

PB - American Institute of Aeronautics and Astronautics Inc.

T2 - 8th AIAA/CEAS Aeroacoustics Conference and Exhibit, 2002

Y2 - 17 June 2002 through 19 June 2002

ER -

Investigation of the physical mechanisms of tonal sound generation by slats

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