Wind tunnel investigations of DU97‐W‐300‐mod equipped with riblets

Schaffarczyk, A. P.; Momber, Andreas W.; Stenzel, Volkmar

doi:10.1002/we.2622

Wind Energy

2021

DOI: 10.1002/we.2622

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Wind tunnel investigations of DU97‐W‐300‐mod equipped with riblets

A. P. Schaffarczyk

Andreas W. Momber

Volkmar Stenzel

Abstract: A well‐known 30% thick wind turbine aerofoil was partially equipped with riblets, and lift and drag data were measured in a large acoustic wind tunnel. Drag was reduced up to 10%, and lift‐to‐drag ratio increased by up to 30%.

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2024

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Cited by 2 publications

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Wind Tunnel Tests of a Thick Wind Turbine Airfoil

Mouton,

Peter Schaffarczyk,

Timmer

2024

Wind Energy

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This article reports about a wind‐tunnel experiment carried out in the ONERA F2 low‐speed wind tunnel on a model of the DU 97‐W‐300Mod airfoil designed for wind turbine application. The wind tunnel, the airfoil model, and experimental techniques used are presented, with special emphasis on the data processing and corrections required to derive airfoil forces and pressure distribution. To better document the flow physics at play, the results are illustrated by infrared thermography and surface oil flow visualization. The test allowed investigating Reynolds number effects between 1 and 3.8 millions. To ameliorate the understanding of the benefits and limitations of such airfoil testing, one section is devoted to the comparison of present results with previous experiments in other wind tunnels. Some of the difficulties arising in airfoil testing are evidenced and discussed to contribute to the improvement of test methods.

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Wind Tunnel Tests of a Thick Wind Turbine Airfoil

Mouton,

Peter Schaffarczyk,

Timmer

2024

Wind Energy

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Hierarchical nested riblet surface for higher drag reduction in turbulent boundary layer

Ou,

Zhou,

Zhou

et al. 2024

Physics of Fluids

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Riblets can be potentially employed to passively reduce the turbulent friction drag. However, the drag reduction performance of riblets does not currently meet expectations, which could assist in emission reduction and energy conservation in green transportation. This study proposes and validates a topological form of hierarchical nested riblets (HNR) that significantly enhances the drag reduction performance. To explore the drag reduction enhancement mechanism, direct numerical simulations are performed for flow simulation on the riblet surface under different Reynolds numbers. The results show that under the riblet dimensionless spacing of the riblet s+≈21, the drag reduction performance of the HNR surface improves by about 70% compared to that of the uniform riblet surface, which is inspired by shark skin. From the perspective of turbulence statistics, the HNR surface reduces the turbulent mixing near the wall, weakening the momentum transfer. Furthermore, the transient flow field shows that the secondary riblet in HNR prevents some turbulent flow and streamwise vortices from entering the groove, considerably weakening the dispersive stress induced by the secondary flow. Moreover, owing to the influence of the secondary riblet, small-scale turbulence develops and strengthens into large-scale turbulent motion, which is advantageous to the boundary layer flow and results in drag reduction improvement.

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Wind tunnel investigations of DU97‐W‐300‐mod equipped with riblets

Abstract: A well‐known 30% thick wind turbine aerofoil was partially equipped with riblets, and lift and drag data were measured in a large acoustic wind tunnel. Drag was reduced up to 10%, and lift‐to‐drag ratio increased by up to 30%.

Cited by 2 publications

References 18 publications

Wind Tunnel Tests of a Thick Wind Turbine Airfoil

Wind Tunnel Tests of a Thick Wind Turbine Airfoil

Hierarchical nested riblet surface for higher drag reduction in turbulent boundary layer

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