Abstract: A cooling device for a rotor assembly of a gas turbine engine includes an airflow nozzle configured to be installed at a cooling location of the rotor assembly. The airflow nozzle extends entirely around a circumference of the rotor assembly and includes a plurality of airflow inlets and a nozzle outlet to direct an airflow toward the cooling location. An airflow source is operably connected to the plurality of airflow inlets.

Abstract: The application relates to a wind turbine component having an optical fiber sensor arranged to detect wind speed over the surface of the component. In one embodiment, the optical fiber sensor has a light loss portion that allows some of the light transmitted through the optical fiber to escape. The amount that the optical fiber bends in the air flow across the surface causes the effective surface area of the light loss portion to increase or decrease. With increased or decreased surface area of the light loss portion, more or less light is lost from the fiber. The intensity of the light transmitted in the fiber can therefore be used as a measure of the amount of bending, and therefore as a measure of the air flow's speed. In other embodiments, the optical fiber includes optical gratings, such as Fiber Bragg Gratings.

Abstract: The application relates to a wind turbine component 18 having an optical fibre sensor 10 arranged to detect the wind speed over the surface of the component. In one embodiment, the optical fibre sensor 10 has a light loss portion 15 that allows some of the light transmitted in the core 11 of the optical fibre to escape. The amount that the optical fibre bends in the air flow across the surface causes the effective surface area of the light loss portion 15 to increase or decrease. With increased or decreased surface area of the light loss portion, more or less light is lost from the fibre. The intensity of the light transmitted in the fibre can therefore be used as a measure of the amount of bending, and therefore as a measure of the air flow's speed. In other embodiments, the optical fibre can comprise optical gratings, such as Fibre Bragg Gratings or Long Period Gratings. Further embodiments use interferometry to measure the extension of the optical fibre.