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:
Nov. 23, 2021
Filed:
May. 14, 2019
Gas turbine engine with fan, bypass duct, and gearbox and method of operating the gas turbine engine
Applicant:
Rolls-royce Plc, London, GB;
Inventors:
Alastair D Moore, Derby, GB;
Robert J Telling, Derby, GB;
Assignee:
ROLLS-ROYCE PLC, London, GB;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
F02K 3/06 (2006.01); F02C 7/36 (2006.01); F02C 3/06 (2006.01);
U.S. Cl.
CPC ...
F02K 3/06 (2013.01); F02C 3/06 (2013.01); F02C 7/36 (2013.01); F05D 2260/96 (2013.01);
Abstract
A gas turbine engine generates noise during use, and one particularly important flight condition for noise generation is take-off. A gas turbine engine has high efficiency together with low noise, in particular from the bypass flow exiting the engine. The average velocity of the flow at the exit to the bypass duct is in the range of from 200 m/s to 275 m/s at a take-off lateral reference point, defined as the point on a line parallel to and 450 m from the runway centre line where the Effective Perceived Noise Level (EPNL) is a maximum during take-off.