The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 09, 2014
Filed:
Sep. 02, 2009
Malcolm L. Hillel, Derby, GB;
Stephen G. Brown, Derby, GB;
Malcolm L. Hillel, Derby, GB;
Stephen G. Brown, Derby, GB;
Rolls-Royce PLC, London, GB;
Abstract
A turbofan gas turbine engine () comprises a variable area exhaust nozzle () arranged at the downstream end of a casing (). A control unit () analyzes the power produced by the gas turbine engine (), the flight speed of the gas turbine engine () and/or the altitude of the gas turbine engine (). The control unit () configures the variable area nozzle () at a first cross-sectional area (A) when the flight speed of the gas turbine engine () is less than a first predetermined value. The control unit () configures the variable area nozzle () at a second, smaller, cross-sectional area (B) when the flight speed of the gas turbine engine () is greater than the first predetermined value and the power produced by the gas turbine engine () is greater than a second predetermined value. The control unit () configures the variable area nozzle () at a third, intermediate, cross-sectional area (C) when the flight speed of the gas turbine engine () is greater than the first predetermined value and the power produced by the gas turbine engine () is less than the second predetermined value.