Phase II – Blind Test

Phase II of the Blind Test campaign introduces active individual blade pitch control to the upstream turbine, challenging participants to simulate advanced wake dynamics.

The wind tunnel experiments were carried-out in the large section 2.5 x 3.5 x 12 m^3 (H x W x L) of the closed-circuit wind tunnel at NTUA. The set up consists of two identically scaled wind turbine models (G1 models) which are placed in line with a longitudinal distance of 5D. In the context of Phase II, the upstream turbine was initially tested in its baseline configuration before being subjected to dynamic helix motion, with amplitude ranges of 3 degrees and helix frequency of fhelix in the range of [0.7,1.3]. The inflow conditions include both Low and High Turbulence Intensities, while Particle Tracking Velocimetry (PTV) measurements were also conducted within the context of Phase II, in a specified dimensionless helix frequency of fhelix = 0.82. A detailed description of the experimental data and all the related documentation can be accessed at the Zenodo repository at: https://doi.org/10.5281/zenodo.15607777

Phase II of the blind test campaign, announced at the WAKE Conference 2025 that took place in Visby, Sweden, offers a unique opportunity to deepen our understanding of helix-based wake control strategies, while also enhancing the existing wind turbine wake modelling strategies.

Please submit your results here: "Phase II – Submission Form".

Deadline for submissions: 30 November 2025.