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Turbine blades

Image Number 2 for United States Patent #4529357.

A hollow turbine blade 10 of aerofoil shaped cross section is provided with walls 18 of varying thicknesses to provide thermal slugging at those regions around the aerofoil profile where the blade experiences high thermal fluxes. The thicker regions of the blade 10 are provided with cooling channels 22 which are elongated in a direction extending from the external surface of the wall towards the internal surface of the wall. The thermal slugging slows down the rate of change of blade wall temperature to a value similar to the rates elsewhere in the blade section. The cooling channels 22 ensure that the temperature gradient across the wall 18 is low around the profile of the aerofoil.

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