Steady and unsteady loading and radiated far-field sound of three NACA series airfoils in a uniform flow

John A Branch; B. Zang; Mahdi Azarpeyvand

doi:10.2514/6.2022-2980

Steady and unsteady loading and radiated far-field sound of three NACA series airfoils in a uniform flow

John A Branch, B. Zang, Mahdi Azarpeyvand

Research output: Chapter in Book/Report/Conference proceeding › Conference Contribution (Conference Proceeding)

3 Citations (Scopus)

137 Downloads (Pure)

Abstract

This paper investigates the hydrodynamic near-field and predicted radiated acoustic far-field of three NACA-series airfoils, namely the NACA 16-616, NACA 16-506, and NACA 0024 profiles, over a range of angles of attack, encompassing the pre-stall, stall, and post-stall flow regimes. In both the static pressure and the pressure fluctuation results, it is shown that each flow regime for each airfoil is easily distinguished, that each regime has different spectral behavior and boundary layer characteristics, and it is further shown that the behavior is different for each airfoil. In particular, it is shown that airfoil shape has a significant impact on both the angle of attack at which stall occurs and on the nature of the stalling mechanism. In the predicted radiated acoustic field, it is found that the variation of sound pressure level with frequency and with angle of attack is different for each airfoil, with airfoil thickness shown to have a significant impact on the abrupt effect of stall on the predicted radiated far-field sound. This is of significance due to the widespread use of aeroacoustic models, such as that proposed by Brooks, Pope, and Marcolini, derived empirically from only one airfoil.

Original language	English
Title of host publication	28th AIAA/CEAS Aeroacoustics 2022 Conference
Subtitle of host publication	AIAA 2022-2980 Session: Hybrid Anechoic Wind Tunnel Workshop II
Publisher	American Institute of Aeronautics and Astronautics Inc. (AIAA)
ISBN (Electronic)	9781624106644
ISBN (Print)	9781624106644
DOIs	https://doi.org/10.2514/6.2022-2980
Publication status	Published - 13 Jun 2022
Event	28th AIAA/CEAS Aeroacoustics 2022 Conference - United Kingdom, Southampton, United Kingdom Duration: 14 Jun 2022 → 17 Jun 2022 https://doi.org/10.2514/6.2022-3095

Publication series

Name	AIAA/CEAS Aeroacoustics Conference
Publisher	AIAA
ISSN (Print)	1946-7826

Conference

Conference	28th AIAA/CEAS Aeroacoustics 2022 Conference
Country/Territory	United Kingdom
City	Southampton
Period	14/06/22 → 17/06/22
Internet address	https://doi.org/10.2514/6.2022-3095

Bibliographical note

Funding Information:
The authors would like to acknowledge the financial support from the Engineering and Physical Sciences Research Council (EPSRC) for the present study via research Grant No. EP/R010846/1, and the first author would also like to acknowledge the support for the PhD studentship from Dowty Propellers and Embraer.

Publisher Copyright:
© 2022, American Institute of Aeronautics and Astronautics Inc, AIAA., All rights reserved.

Keywords

Aeroacoustics
Stall
NACA

Access to Document

10.2514/6.2022-2980

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Branch, J. A., Zang, B., & Azarpeyvand, M. (2022). Steady and unsteady loading and radiated far-field sound of three NACA series airfoils in a uniform flow. In 28th AIAA/CEAS Aeroacoustics 2022 Conference: AIAA 2022-2980 Session: Hybrid Anechoic Wind Tunnel Workshop II Article AIAA 2022-2980 (AIAA/CEAS Aeroacoustics Conference). American Institute of Aeronautics and Astronautics Inc. (AIAA). https://doi.org/10.2514/6.2022-2980

Branch, John A ; Zang, B. ; Azarpeyvand, Mahdi. / Steady and unsteady loading and radiated far-field sound of three NACA series airfoils in a uniform flow. 28th AIAA/CEAS Aeroacoustics 2022 Conference: AIAA 2022-2980 Session: Hybrid Anechoic Wind Tunnel Workshop II. American Institute of Aeronautics and Astronautics Inc. (AIAA), 2022. (AIAA/CEAS Aeroacoustics Conference).

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title = "Steady and unsteady loading and radiated far-field sound of three NACA series airfoils in a uniform flow",

abstract = "This paper investigates the hydrodynamic near-field and predicted radiated acoustic far-field of three NACA-series airfoils, namely the NACA 16-616, NACA 16-506, and NACA 0024 profiles, over a range of angles of attack, encompassing the pre-stall, stall, and post-stall flow regimes. In both the static pressure and the pressure fluctuation results, it is shown that each flow regime for each airfoil is easily distinguished, that each regime has different spectral behavior and boundary layer characteristics, and it is further shown that the behavior is different for each airfoil. In particular, it is shown that airfoil shape has a significant impact on both the angle of attack at which stall occurs and on the nature of the stalling mechanism. In the predicted radiated acoustic field, it is found that the variation of sound pressure level with frequency and with angle of attack is different for each airfoil, with airfoil thickness shown to have a significant impact on the abrupt effect of stall on the predicted radiated far-field sound. This is of significance due to the widespread use of aeroacoustic models, such as that proposed by Brooks, Pope, and Marcolini, derived empirically from only one airfoil.",

keywords = "Aeroacoustics, Stall, NACA",

author = "Branch, {John A} and B. Zang and Mahdi Azarpeyvand",

note = "Funding Information: The authors would like to acknowledge the financial support from the Engineering and Physical Sciences Research Council (EPSRC) for the present study via research Grant No. EP/R010846/1, and the first author would also like to acknowledge the support for the PhD studentship from Dowty Propellers and Embraer. Publisher Copyright: {\textcopyright} 2022, American Institute of Aeronautics and Astronautics Inc, AIAA., All rights reserved.; 28th AIAA/CEAS Aeroacoustics 2022 Conference ; Conference date: 14-06-2022 Through 17-06-2022",

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Branch, JA, Zang, B & Azarpeyvand, M 2022, Steady and unsteady loading and radiated far-field sound of three NACA series airfoils in a uniform flow. in 28th AIAA/CEAS Aeroacoustics 2022 Conference: AIAA 2022-2980 Session: Hybrid Anechoic Wind Tunnel Workshop II., AIAA 2022-2980, AIAA/CEAS Aeroacoustics Conference, American Institute of Aeronautics and Astronautics Inc. (AIAA), 28th AIAA/CEAS Aeroacoustics 2022 Conference, Southampton, United Kingdom, 14/06/22. https://doi.org/10.2514/6.2022-2980

Steady and unsteady loading and radiated far-field sound of three NACA series airfoils in a uniform flow. / Branch, John A; Zang, B.; Azarpeyvand, Mahdi.
28th AIAA/CEAS Aeroacoustics 2022 Conference: AIAA 2022-2980 Session: Hybrid Anechoic Wind Tunnel Workshop II. American Institute of Aeronautics and Astronautics Inc. (AIAA), 2022. AIAA 2022-2980 (AIAA/CEAS Aeroacoustics Conference).

Research output: Chapter in Book/Report/Conference proceeding › Conference Contribution (Conference Proceeding)

TY - GEN

T1 - Steady and unsteady loading and radiated far-field sound of three NACA series airfoils in a uniform flow

AU - Branch, John A

AU - Zang, B.

AU - Azarpeyvand, Mahdi

N1 - Funding Information: The authors would like to acknowledge the financial support from the Engineering and Physical Sciences Research Council (EPSRC) for the present study via research Grant No. EP/R010846/1, and the first author would also like to acknowledge the support for the PhD studentship from Dowty Propellers and Embraer. Publisher Copyright: © 2022, American Institute of Aeronautics and Astronautics Inc, AIAA., All rights reserved.

PY - 2022/6/13

Y1 - 2022/6/13

N2 - This paper investigates the hydrodynamic near-field and predicted radiated acoustic far-field of three NACA-series airfoils, namely the NACA 16-616, NACA 16-506, and NACA 0024 profiles, over a range of angles of attack, encompassing the pre-stall, stall, and post-stall flow regimes. In both the static pressure and the pressure fluctuation results, it is shown that each flow regime for each airfoil is easily distinguished, that each regime has different spectral behavior and boundary layer characteristics, and it is further shown that the behavior is different for each airfoil. In particular, it is shown that airfoil shape has a significant impact on both the angle of attack at which stall occurs and on the nature of the stalling mechanism. In the predicted radiated acoustic field, it is found that the variation of sound pressure level with frequency and with angle of attack is different for each airfoil, with airfoil thickness shown to have a significant impact on the abrupt effect of stall on the predicted radiated far-field sound. This is of significance due to the widespread use of aeroacoustic models, such as that proposed by Brooks, Pope, and Marcolini, derived empirically from only one airfoil.

AB - This paper investigates the hydrodynamic near-field and predicted radiated acoustic far-field of three NACA-series airfoils, namely the NACA 16-616, NACA 16-506, and NACA 0024 profiles, over a range of angles of attack, encompassing the pre-stall, stall, and post-stall flow regimes. In both the static pressure and the pressure fluctuation results, it is shown that each flow regime for each airfoil is easily distinguished, that each regime has different spectral behavior and boundary layer characteristics, and it is further shown that the behavior is different for each airfoil. In particular, it is shown that airfoil shape has a significant impact on both the angle of attack at which stall occurs and on the nature of the stalling mechanism. In the predicted radiated acoustic field, it is found that the variation of sound pressure level with frequency and with angle of attack is different for each airfoil, with airfoil thickness shown to have a significant impact on the abrupt effect of stall on the predicted radiated far-field sound. This is of significance due to the widespread use of aeroacoustic models, such as that proposed by Brooks, Pope, and Marcolini, derived empirically from only one airfoil.

KW - Aeroacoustics

KW - Stall

KW - NACA

U2 - 10.2514/6.2022-2980

DO - 10.2514/6.2022-2980

M3 - Conference Contribution (Conference Proceeding)

SN - 9781624106644

T3 - AIAA/CEAS Aeroacoustics Conference

BT - 28th AIAA/CEAS Aeroacoustics 2022 Conference

PB - American Institute of Aeronautics and Astronautics Inc. (AIAA)

T2 - 28th AIAA/CEAS Aeroacoustics 2022 Conference

Y2 - 14 June 2022 through 17 June 2022

ER -

Branch JA, Zang B, Azarpeyvand M. Steady and unsteady loading and radiated far-field sound of three NACA series airfoils in a uniform flow. In 28th AIAA/CEAS Aeroacoustics 2022 Conference: AIAA 2022-2980 Session: Hybrid Anechoic Wind Tunnel Workshop II. American Institute of Aeronautics and Astronautics Inc. (AIAA). 2022. AIAA 2022-2980. (AIAA/CEAS Aeroacoustics Conference). doi: 10.2514/6.2022-2980

Steady and unsteady loading and radiated far-field sound of three NACA series airfoils in a uniform flow

Abstract

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Bibliographical note

Keywords

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