Patent ID: 7137777
Filing Date: 2006-11-21
Classification: F01D,F05D

Abstract:
1. A device for separating foreign particles out of cooling air to be fed to rotor blades of a turbine, the device comprising: stationary nozzle units for feeding the cooling air to an annular space formed between wall parts of a turbine stator and a rotating wheel disk, the nozzle units configured for directing the cooling air in a stream flowing in a circumferential direction inside the annular space; ducts communicating with the annular space for feeding the cooling air into the rotor blades, the ducts being arranged in the wheel disk; a diverter unit associated with the annular space and comprising a surface region; wherein the diverter unit is configured such that before the cooling air enters the ducts, foreign particles in the cooling air emerging from the nozzle units are centrifugally moved into a radially outer part of the annular space and are separated out of the annular space together with a barrier-air fraction of the cooling air; and wherein the surface region of the diverter unit is configured such that when the stream of cooling air passes through the nozzle units and impinges the surface region, the stream of cooling air is diverted by the surface region in a radially outward direction through an angle greater than 90°.