Mechanisms of airfoil noise near stall conditions

Giovanni Lacagnina, Paruchuri Chaitanya, Tim Berk, Jung-Hoon Kim, Phillip Joseph, Bharathram Ganapathisubramani, Seyed Mohammad Hasheminejad, Tze Pei Chong, Oksana Stalnov, Kwing-So Choi, Muhammad Farrukh Shahab, Mohammad Omidyeganeh, and Alfredo Pinelli
Phys. Rev. Fluids 4, 123902 – Published 6 December 2019

Abstract

The focus of this paper is on investigating the noise produced by an airfoil at high angles of attack over a range of Reynolds number Re2×1054×105. The objective is not modeling this source of noise but rather understanding the mechanisms of generation for surface pressure fluctuations, due to a separated boundary layer, that are then scattered by the trailing edge. To this aim, we use simultaneous noise and surface pressure measurement in addition to velocimetric measurements by means of hot wire anemometry and time-resolved particle image velocimetry. Three possible mechanisms for the so-called “separation-stall noise” have been identified in addition to a clear link between far-field noise, surface pressure, and velocity fields in the noise generation.

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  • Received 11 March 2019

DOI:https://doi.org/10.1103/PhysRevFluids.4.123902

©2019 American Physical Society

Physics Subject Headings (PhySH)

Fluid Dynamics

Authors & Affiliations

Giovanni Lacagnina* and Paruchuri Chaitanya

  • Institute of Sound and Vibration Research, University of Southampton, Southampton SO17 1BJ, United Kingdom

Tim Berk

  • Aerodynamics and Flight Mechanics Research Group, University of Southampton, Southampton SO17 1BJ, United Kingdom

Jung-Hoon Kim

  • Faculty of Engineering, University of Nottingham, Nottingham NG7 2RD, United Kingdom

Phillip Joseph

  • Institute of Sound and Vibration Research, University of Southampton, Southampton SO17 1BJ, United Kingdom

Bharathram Ganapathisubramani

  • Aerodynamics and Flight Mechanics Research Group, University of Southampton, Southampton SO17 1BJ, United Kingdom

Seyed Mohammad Hasheminejad

  • Department of Mechanical, Aerospace and Civil Engineering, Brunel University, London UB8 3PH, United Kingdom

Tze Pei Chong

  • Department of Mechanical, Aerospace and Civil Engineering, Brunel University, London UB8 3PH, United Kingdom

Oksana Stalnov

  • Technion–Israel Institute of Technology, Haifa 3200003, Israel

Kwing-So Choi

  • Faculty of Engineering, University of Nottingham, Nottingham NG7 2RD, United Kingdom

Muhammad Farrukh Shahab, Mohammad Omidyeganeh, and Alfredo Pinelli

  • School of Mathematics, Computer Science and Engineering, City University London, London EC1V 0HB, United Kingdom

  • *g.lacagnina@soton.ac.uk

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Issue

Vol. 4, Iss. 12 — December 2019

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