Numerical analysis of noise reduction mechanisms on improved trailing edge serrations using the Lattice Boltzmann method

W. C.P. van der Velden, S. Oerlemans

Research output: Chapter in Book/Conference proceedings/Edited volumeConference contributionScientificpeer-review

Abstract

This study investigates the flow topology and noise emission from an airfoil with combed teeth trailing edge geometry, to understand the noise reduction mechanisms observed in earlier experiments. A comparison is made to a straight trailing edge and a serrated trailing edge without combs. The different trailing edges are retrofitted to a NACA0018 airfoil at zero angle of attack. The flow field is analyzed by evaluating the fully explicit, transient, compressible Lattice Boltzmann equation. The acoustic far field is obtained by means of a Ffowcs-Williams and Hawkings integral solution. The simulated acoustic far field results and boundary layer characteristics for the teeth configuration match earlier experiments well. Furthermore, the numerical results confirm that the combed teeth give a larger noise reduction than the standard teeth. It is hypothesized that the main noise-suppression mechanism of the combs is an improvement in the streamline angles: in general, the flow tends to be less three-dimensional and more aligned with the serration edge. As a result, less vorticity is produced, especially at the root of the serrations.

Original languageEnglish
Title of host publication35th Wind Energy Symposium, 2017
PublisherAmerican Institute of Aeronautics and Astronautics Inc. (AIAA)
Number of pages24
ISBN (Electronic)978-1-62410-456-5
DOIs
Publication statusPublished - 2017
Event35th Wind Energy Symposium - Grapevine, United States
Duration: 9 Jan 201713 Jan 2017
Conference number: 35
http://arc.aiaa.org/doi/book/10.2514/MWES17

Conference

Conference35th Wind Energy Symposium
CountryUnited States
CityGrapevine
Period9/01/1713/01/17
Internet address

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