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Wind Energy Science The interactive open-access journal of the European Academy of Wind Energy
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https://doi.org/10.5194/wes-2020-40
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/wes-2020-40
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

  21 Feb 2020

21 Feb 2020

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A revised version of this preprint was accepted for the journal WES and is expected to appear here in due course.

Aerodynamic Effects of Gurney Flaps on the Rotor Blades of a Research Wind Turbine

Jörg Alber1, Rodrigo Soto-Valle1, Marinos Manolesos2, Sirko Bartholomay1, Christian Navid Nayeri1, Marvin Schönlau1, Christian Menzel1, Christian Oliver Paschereit1, Joachim Twele3, and Jens Fortmann3 Jörg Alber et al.
  • 1Technische Universität Berlin, Hermann-FöttingerInstitut, Müller-Breslau-Str. 8, 10623 Berlin, Germany
  • 2College of Engineering, Swansea University, Bay Campus, Fabian Way, Swansea, SA1 8EN, United Kingdom
  • 3Hochschule für Technik und Wirtschaft Berlin, Wilhelminenhofstraße 75A, 12459 Berlin, Germany

Abstract. This paper investigates the aerodynamic impact of Gurney flaps on a research wind turbine of the Hermann-Föttinger Institute at the Technische Universität Berlin. The rotor radius is 1.5 meters and the blade configurations consist of the clean and the tripped baseline cases emulating the effects of forced leading edge transition. The wind tunnel experiments include three operation points based on tip speed ratios of 3.0, 4.3 and 5.6, reaching Reynold numbers of approximately 250,000. The measurements are taken by means of three different methods; Ultrasonic Anemometry in the wake, surface pressure taps in the mid-span blade region and strain gauges at the blade root. The retrofit application consists of two Gurney flap heights of 0.5 % and 1.0 % in relation to the chord length, which are implemented perpendicular to the pressure side at the trailing edge. As a result, the Gurney flap configurations evoke performance improvements in terms of the axial wake velocities, the angles-of-attack and the lift coefficients. The enhancement of the root bending moments imply an increase of both the rotor torque and the thrust. Furthermore, the aerodynamic impact appears to be more pronounced in the tripped case compared to the clean case. Gurney flaps are considered a worthwhile passive flow-control device in order to alleviate the adverse effects of early separation and leading edge erosion of horizontal axis wind turbines.

Jörg Alber et al.

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Jörg Alber et al.

Jörg Alber et al.

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Latest update: 29 Oct 2020
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Short summary
The aerodynamic impact of Gurney flaps is investigated on the rotor blades of the Berlin Research Turbine. The findings of this research project contribute to performance improvements of different-size rotor blades. Gurney flaps are considered a worthwhile passive flow-control device in order to alleviate the adverse effects of both early separation in the inner blade region and leading edge erosion throughout large parts of the blade span.
The aerodynamic impact of Gurney flaps is investigated on the rotor blades of the Berlin...
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