Turbine abradable layer with progressive wear zone terraced ridges

US8939707B1 · kind B1 · utility

Assignee

• SIEMENS ENERGY, INC. · US

Inventors

• Ching-Pang Lee · Cincinnati, US
• Kok-Mun Tham · Oviedo, US
• Gm Salam Azad · Oviedo, US
• Zhihong Gao · Taipei, TW
• Neil Hitchman · Carmel, US
• David G. Sansom · Oviedo, US
• Barrry L. Allmon · Matthews, US

Key dates

• Filing date: Feb 25, 2014
• Grant date: Jan 27, 2015
• Expiry date: Feb 25, 2034

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F05D2300/6033
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

Turbine and compressor casing abradable component embodiments for turbine engines, with composite grooves and vertically projecting rows of stepped first ridges in planform patterns, to reduce, redirect and/or block blade tip airflow leakage downstream into the grooves rather than from turbine blade airfoil high to low pressure sides. Each stepped first ridge has a first portion proximal the substrate surface with a pair of first opposed lateral walls terminating in a plateau, and a second portion terminating in a ridge tip. These ridge or rib embodiments have first lower and second upper wear zones. The lower zone, which at and below first portion height, optimizes engine airflow characteristics, while the upper zone, between the plateau and the second portion ridge is optimized to minimize blade tip gap and wear by being more easily abradable than the lower zone.