Improved Blockage Corrections for Two-Dimensional Profiles in Deep Stall

Improved Blockage Corrections for Two-Dimensional Profiles in Deep Stall: Experimental and Computational Analysis of the DU91-W2-250 Profile subject to Tunnel Wall Constraint

Landstra, F.W.

Bijl, H. (mentor)
Timmer, W.A. (mentor)
van Zuijlen, A.H. (mentor)

Aerospace Engineering

2010-08-10

Wind engineering is becoming an increasingly important field of research. The pursuit for larger and more efficient wind turbines make the accurate prediction of forces and moments on turbine blades evermore crucial. During wind turbine starts and stops the turbine blades are subjected to large angles of attack. At these large angles the flow over the blades is fully separated, the blades are in deep stall. The prediction of loads on turbine blades is based on the performance of its two-dimensional profiles. Profile performance is measured in the windtunnel and the data is corrected for the constraint the tunnel walls impose on the flow. For bodies subject to fully separated flow, tunnel wall corrections are based on empirically derived methods and for two-dimensional profiles spanning the windtunnel testsection, Boorsma (2003) has shown these methods to be relatively inaccurate.

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Student theses

master thesis

(c) Delft University of Technology