2D numerical comparison of trailing edge flaps - Upwind WP1B3

ISSN 0106-2840 ISBN 978-87-550-3647-5 This report covers the investigations and comparisons of trailing edge flaps carried out by Delft and Riso. The work is a part of the W1B3 work package of the UpWind EU-project. This report covers only 2D test cases with simple control of the trailing edge flap with the objective of keeping CL Contract no.: Group's own reg. no.: 1110051-01 Sponsorship: constant. The 5MW UpWind reference turbine is used for the calculations. The section in 75% radius is investigated for three different cases; 1) a wind step from 10m/s to 11m/s, 2) a wind “gust” from 10 m/s to 14m/s in 1 second and followed by 10m/s, 3) finally a turbulent wind series is simulated, and the performance of the flaps is investigated. The two different codes from Delft and Riso are compared in the mentioned cases.