Air modulation apparatus

US4416111A · kind A · utility

Assignee

• The United States of America as represented by the Administrator of the National Aeronautics and Space Administration · US

Inventors

• Dean T. Lenahan · Cincinnati, US
• Robert J. Corsmeier · Cincinnati, US
• Albert P. Sterman · Cincinnati, US

Key dates

• Filing date: Feb 25, 1981
• Grant date: Nov 22, 1983
• Expiry date: Feb 25, 2001

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F01D5/081
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

An air modulation apparatus, such as for use in modulating cooling air to the turbine section of a gas turbine engine. The apparatus includes valve means disposed around an annular conduit, such as a nozzle, in the engine cooling air circuit. The valve means, when in a closed position, blocks a portion of the conduit, and thus reduces the amount and increases the velocity of cooling air flowing through the nozzle. The apparatus also includes actuation means, which can operate in response to predetermined engine conditions, for enabling opening and closing of the valve means.