Abstract: A method for determining an incident flow at a rotor blade of a wind power installation is provided. The method includes recording at least part of a pressure spectrum of pressure, in particular wall pressure, at the rotor blade at at least one measurement position. The method includes determining at least two characteristic values from the pressure spectrum, determining an indicator value from a relationship between the at least two characteristic values and assessing whether a critical incident flow is present depending on the indicator value.

Abstract: A wind turbine rotor blade including a suction side, a pressure side, a blunt trailing edge, and a trailing edge enlargement unit arranged at the blunt trailing edge and has at least two stages. The trailing edge enlargement unit has a first portion and a second portion, where a transition from the blunt trailing edge to the first portion is substantially non-perpendicular and a transition between the first and second portions is also non-perpendicular.

Abstract: A method for operating a wind power installation having a rotor with rotor blades with an adjustable blade angle is provided. The installation is operated in a full-load mode for delivering a system-specific maximum power and in a partial-load mode for delivering a lower power, up to the system-specific maximum power. The installation in the partial-load mode operates according to choice in a normal mode or a limited mode, in each case based on an operating characteristic, which specifies a relationship between a rotational speed (n) of the rotor and the power to be delivered. A first operating characteristic is provided for operating the installation in the normal mode, and at least one second operating characteristic is provided for operating in the limited mode. The second operating characteristic provides a higher power for at least one rotational speed range than the first operating characteristic for the rotational speed range.

Abstract: A method for operating a wind power installation having a rotor and a generator driven via the rotor for generating electrical power, in which provides for an adapted rotational speed of the rotor of the wind power installation for generating electrical power to be output to be specified using the adapted operational management and therefore using the air density relevant to the wind power installation, wherein, for generating optimized electrical power to be output, the adapted rotational speed is an increased rotational speed for a reduced air density or a reduced rotational speed for an increased air density, wherein additionally or alternatively a sound emission of the wind power installation is determined for the specified adapted rotational speed of the rotor using the air density relevant to the wind power installation, and the adapted rotational speed is corrected, in particular on the basis of the determined sound emission, using the air density relevant to the wind power installation.

Abstract: A wind turbine rotor blade including a suction side, a pressure side, a blunt trailing edge, and a trailing edge enlargement unit arranged at the blunt trailing edge and has at least two stages. The trailing edge enlargement unit has a first portion and a second portion, where a transition from the blunt trailing edge to the first portion is substantially non-perpendicular and a transition between the first and second portions is also non-perpendicular.

Abstract: A method for operating a wind power installation having a rotor with rotor blades with an adjustable blade angle is provided. The installation is operated in a full-load mode for delivering a system-specific maximum power and in a partial-load mode for delivering a lower power, up to the system-specific maximum power. The installation in the partial-load mode operates according to choice in a normal mode or a limited mode, in each case based on an operating characteristic, which specifies a relationship between a rotational speed (n) of the rotor and the power to be delivered. A first operating characteristic is provided for operating the installation in the normal mode, and at least one second operating characteristic is provided for operating in the limited mode. The second operating characteristic provides a higher power for at least one rotational speed range than the first operating characteristic for the rotational speed range.