City Research Online

Mechanisms of airfoil noise near stall conditions

Lacagnina, G., Chaitanya, P., Berk, T., Kim, J-H., Joseph, P., Ganapathisubramani, B., Hasheminejad, S. M., Chong, T. P., Stalnov, O., Choi, K-S., Shahab, M. F., Omidyeganeh, M. ORCID: 0000-0002-4140-2810 and Pinelli, A. ORCID: 0000-0001-5564-9032 (2019). Mechanisms of airfoil noise near stall conditions. Physical Review Fluids, 4(12), 123902.. doi: 10.1103/PhysRevFluids.4.123902

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
Re≈2×10⁵–4×10⁵. 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.

Publication Type: Article
Subjects: T Technology > TL Motor vehicles. Aeronautics. Astronautics
Departments: School of Mathematics, Computer Science & Engineering > Engineering > Mechanical Engineering & Aeronautics
Date Deposited: 03 Jan 2020 08:41
URI: https://openaccess.city.ac.uk/id/eprint/23398
[img]
Preview
Text - Accepted Version
Download (322kB) | Preview

Export

Downloads

Downloads per month over past year

View more statistics

Actions (login required)

Admin Login Admin Login