Turbine blade for use in the wet steam region of penultimate and ultimate stages of turbines

US6004102A · kind A · utility

Assignee

• ABB PATENT GMBH · DE

Inventors

• Gustav Kuefner · Nuremberg, DE
• Horst Mueller · Rio Rancho, US
• Martin Breindl · Sengenthal, DE
• Bernd Sokol · Burgthann, DE
• Walter Zeisler · Nuremberg, DE

Key dates

• Filing date: Aug 11, 1997
• Grant date: Dec 21, 1999
• Expiry date: Aug 11, 2017

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F05D2250/294
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

A turbine blade which is provided for use in a wet steam region of penultimate and ultimate stages of turbines and is subject to erosive wear caused by impinging water droplets, is treated in a region of leading edges and parts of a blade leaf in such a way as to reduce the erosive wear. In order to reduce the erosive effect of the water droplets, the blade leaf has a surface roughness in the region of its leading edge and its blade back or in at least a partial region thereof. The surface roughness is markedly increased in comparison with the surface roughness of a front side of the blade leaf.