Method for impingement air cooling for gas turbines

US8152463B2 · kind B2 · utility

Assignee

• ROLLS-ROYCE DEUTSCHLAND LTD & CO KG · DE

Inventors

• Frank Haselbach · Melbourne, GB
• Erik Janke · Berlin, DE
• Jens Taege · Berlin, DE
• Timm Janetzke · Berlin, DE
• Wolfgang Hartmut Nitsche · Humble, US
• Matthias Reyer · Berlin, DE

Key dates

• Filing date: Feb 15, 2008
• Grant date: Apr 10, 2012
• Expiry date: Feb 10, 2031

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F23R2900/03044
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

In impingement air cooling of gas turbine components, cooling air velocity packs of a certain amplitude and a given frequency are applied to impingement air openings, with intervallic annular swirl structures being formed which penetrate a cross-flow and hit a component to be cooled with high intensity, thus providing for efficient cooling. In order to obtain annular swirl structures with optimum cooling effect, the Strouhal number, which is determined by a ratio of amplitude, frequency of the velocity packs and size of impingement air cooling openings, ranges between 0.2 and 2.0, and preferably between 0.8 and 1.2.