Abstract
This study experimentally investigated the influence of wake effect and production of mechanical power in wind tunnel of wind turbine arrays. Wind turbine arrays consist of 2 rows with 3 columns for spacing wind turbines in rows apart in the windward direction 1.77 rotor diameters and apart in the crosswind direction 8.85 rotor diameters. The wake characteristics such as profiles of time averaged velocity, turbulence intensity, centerline velocity deficit and wake radius for far wake regions in position 1, 2, and 3 were measured and analysed. The vertical and lateral profiles of velocity and turbulence intensity were studied. Concerning the results from measured data, empirical relations for the centerline velocity deficit, turbulence intensity and wake radius were proposed. Based on the experimental results, the power loss is due to the wake flow of upwind turbine approximately 20% when the downwind distance 8.85 rotor diameters. This is different with numerical result study that 11% at downwind distance is 8.85 rotor diameters. This difference results from the influence of ambient turbulence on the production of mechanical power of the wind turbine.
Highlights
Schreck et al (2008) have identified the most significant research topics about wind turbine dynamics, micrositing and array effects needed for characterizing wind resources and wind power generation
This downstream velocity deficit can lead to power losses in wind farms that are approximately 15-35% when compared to the same number of turbines in isolation (Spera, 2009; Barthelmie et al, 2009)
This study experimentally investigated the influence of wake effect and production of mechanical power in wind tunnel of wind turbine arrays
Summary
Schreck et al (2008) have identified the most significant research topics about wind turbine dynamics, micrositing and array effects needed for characterizing wind resources and wind power generation. It is important to understand the interaction between the wake effect of a wind turbine and the atmospheric turbulence in order to predict its structural load and power performance (Magnusson et al, 1996; Thomsen and Sorensen, 1999). This downstream velocity deficit can lead to power losses in wind farms that are approximately 15-35% when compared to the same number of turbines in isolation (Spera, 2009; Barthelmie et al, 2009). The effect of turbulence was investigated by Sicot et al (2006) on the power production used wind tunnel experiment of a horizontal axis wind turbine. Wind turbines and area used in this study to represent a wind farm to down-scale condition of the full-scale
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