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Norrekaer Enge Power Deficit 2

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The benchmark is open to participants of Wakebench who want to analyze wind farm measurements for wake model validation. 


is to determine power deficit along straight rows of turbines in the wind farm. The turbines in flow sector 165 deg  has a constant spacing of 6.3D, while the spacing in direction 257 deg is constant and equal to 8.2D except for a large gap of 26.7D where speed recovery is to be expected.

Data Accessibility

The benchmark is offered to all participants of the IEA Task 31 Wakebench.

Input data

Approximately one year of 10-minute statistics for power and wind measurements recorded in a 42 x 300 kW wind farm have been made available for this benchmark. The following inflow conditions will be considered:

  • Wind speed interval: 9 – 11 m/s;
  • Turbulence intensity: all
  • Flow sectors: 155-175º and 247-267º

Validation data

  1. Power deficit along 6 distinct rows (A, B, C, D, E & F) determined as function of spacing for a direction of 165º with reference to M1.
  2. Power deficit along 7 distinct rows (A1-F1, A2-F2, A3-F3, A4-F4, A5-F5, A6-F6 & A6-F6) determined as function of internal spacing for a direction 257º with reference to M1.

Power deficit = 1 - Power(A2)/Power(A1)

Model runs

Not applicable

Output data

  1. Power deficit as function of distance based on 6.3 D wind turbine spacing;
  2.  Power deficit as function of distance based on 8.2 D wind turbine spacing including a 26.7 D gap;

A dedicated excel spreadsheet template has been attached in order to provide the outputs in a standardized format; which include a data sheet for reporting park power deficit for 6.3 and 8.2 D spacing.


Please include a short description of the methodology; which has been used to identify potential observations, filtering criterion and the averaging procedure in maximum 1 page.