Abstract
Abstract. A procedure to propagate longitudinal transient gusts through a flow
field by using the resolved-gust approach is implemented in the URANS solver
THETA. Both the gust strike of a 1−cos() gust and an extreme operating
gust following the IEC 61400-1 standard are investigated on the generic NREL
5 MW wind turbine at rated operating conditions. The impact of both gusts on
pressure distributions, rotor thrust, rotor torque, and flow states on the
blade are examined and quantified. The flow states on the rotor blade before
the gust strike at maximum and minimum gust velocity are compared. An
increased blade loading is detectable in the pressure coefficients and
integrated blade loads. The friction force coefficients indicate the dynamic
separation and re-attachment of the flow during the gust. Moreover, a
verification of the method is performed by comparing the rotor torque during
the extreme operating gust to results of FAST rotor code.
Funder
Bundesministerium für Wirtschaft und Energie
Subject
Energy Engineering and Power Technology,Renewable Energy, Sustainability and the Environment
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