Method and apparatus for rapid thrust increases in a turbofan engine

US4184327A · kind A · utility

Assignee

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

Inventors

• Jack E. Cornett · Cincinnati, US
• Ralph Corley · Pensacola, US
• Thomas O. Fraley · Middletown, US
• Andrew A. Saunders, Jr. · Cincinnati, US

Key dates

• Filing date: Dec 9, 1977
• Grant date: Jan 22, 1980
• Expiry date: Dec 9, 1997

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F02C9/54
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

Upon a landing approach, the normal compressor stator schedule of a fan speed controlled turbofan engine is temporarily varied to substantially close the stators to thereby increase the fuel flow and compressor speed in order to maintain fan speed and thrust. This running of the compressor at an off-design speed substantially reduces the time required to subsequently advance the engine speed to the takeoff thrust level by advancing the throttle and opening the compressor stators.