Aerodynamic effects of Gurney flaps on the rotor blades of a research wind turbine
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Published:2020-11-26
Issue:4
Volume:5
Page:1645-1662
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ISSN:2366-7451
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Container-title:Wind Energy Science
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language:en
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Short-container-title:Wind Energ. Sci.
Author:
Alber Jörg, Soto-Valle Rodrigo, Manolesos Marinos, Bartholomay SirkoORCID, Nayeri Christian Navid, Schönlau Marvin, Menzel Christian, Paschereit Christian Oliver, Twele Joachim, Fortmann JensORCID
Abstract
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 m, 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 Reynolds numbers of approximately 2.5×105. The
measurements are taken by means of three different methods: ultrasonic
anemometry in the wake, surface pressure taps in the midspan blade region,
and strain gauges at the blade root. The retrofit applications consist 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 lead to
performance improvements in terms of the axial wake velocities, the
angles of attack and the lift coefficients. The enhancement of the root
bending moments implies an increase in 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
passive flow-control device worth investigating for the use on horizontal-axis wind turbines.
Publisher
Copernicus GmbH
Subject
Energy Engineering and Power Technology,Renewable Energy, Sustainability and the Environment
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