Patent Number: 6,168,380

Title: Cooling system for the leading-edge region of a hollow gas-turbine blade

Abstract: In a cooling system for the leading-edge region of a hollow gas-turbine blade, a duct (10) extends inside the thickened blade leading edge (5) from the blade root (1) up to the blade tip (2). The duct (10), via a plurality of bores (9) made in the blade leading edge, communicates with a main duct (3), through which the cooling medium flows longitudinally, and the flow through the duct (10) occurs longitudinally over the blade height, and the duct (10) is formed with a variable cross section. The cross section of the duct (10) increases continuously in the direction of flow of the cooling medium from the blade root up to the blade tip. In the case of blades having a cover plate (11), the duct (10) merges at its top end into a chamber (12), which is mounted below the cover plate and is in operative connection with a pressure source, the pressure of which is lower than the pressure in the main duct.

Inventors: Weigand; Bernhard (Waldshut-Tiengen, DE)

Assignee: Asea Brown Boveri AG

International Classification: F01D 5/18 (20060101); F01D 005/18 ()

Expiration Date: 01/02/2018