Posters
Come meet the poster presenters to ask them questions and discuss their work
We would like to invite you to come and see the posters at our upcoming conference. The posters will showcase a diverse range of research topics, and will give delegates an opportunity to engage with the authors and learn more about their work. Whether you are a seasoned researcher or simply curious about the latest developments in your field, we believe that the posters will offer something of interest to everyone. So please join us at the conference and take advantage of this opportunity to learn and engage with your peers in industry and the academic community.
On 9 April at 17:15, we’ll also hold the main poster session and distinguish the 7 best posters of this year’s edition with our traditional Poster Awards Ceremony. Join us at the poster area to cheer and meet the laureates, and enjoy some drinks with all poster presenters!
We look forward to seeing you there!
PO165: Wind tunnel testing of realistic leading edge roughness
Anders S. Olsen, Senior Development Engineer, DTU
Abstract
An accurate prediction of the performance loss for aerofoil sections with leading edge roughness (LER) is important in order to estimate the power loss of wind turbines, which can be used in the planning of blade repairs. The method for testing realistic LER in wind tunnel tests of aerofoils is still an open question. The present work, which is part of the project LERCat (Leading Edge Roughness Categorisation), present a methodology for extracting more realistic LER patterns from wind turbine blades and testing them on aerofoil models in wind tunnels. The obtained LER patches are also directly applicable in numerical simulations. The workflow for extracting the LER patches is: first an imprint is made from a damaged blade, then a plaster cast is made from the imprint and this is 3D scanned. The roughness pattern is extracted from the scan and it is unfolded, so it is applicable on any other aerofoil by wrapping it around the LE. The main issue is that the reference aerofoil is not known, both due to missing information on the actual aerofoil and because there will be differences between the nominal shape and the manufactured blade. The extracted LER patches are tested on a 0.9m chord and 2m span model of a FFA-W3-211 aerofoil in the Poul la Cour tunnel (PLCT). The model has an exchangeable LE at 15% chord. The performance loss of the aerofoil section with a more realistic LER differs from the more conventional methods for simulating LER, i.e. zigzag-tape and wrap around sandpaper. With the two tested LER patterns giving performance losses in-between a P40 and P400 sandpaper. The initial tests revealed that the first method for applying the LER on the wind tunnel model is too simple and a better approach is investigated, so far with promissing results.
No recording available for this poster.
