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:
Oct. 27, 2015
Filed:
Jun. 25, 2014
Applicant:
Rolls-royce Plc, London, GB;
Inventors:
Jochen Rupp, Burton-on-Trent, GB;
Anthony John Moran, Nuneaton, GB;
Assignee:
ROLLS-ROYCE plc, London, GB;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
F02K 1/00 (2006.01); F02K 1/34 (2006.01); F23R 3/00 (2006.01);
U.S. Cl.
CPC ...
F02K 1/34 (2013.01); F23R 3/002 (2013.01); F23R 2900/00014 (2013.01);
Abstract
A duct and a method for damping pressure waves caused by thermoacoustic instability, the duct comprising: a locking Helmholtz resonator positioned on the circumference of the duct, the locking Helmholtz resonator tuned to a first frequency; and one or more damping Helmholtz resonators positioned on the circumference of the duct at or adjacent to 90 and/or 270 degrees from the locking Helmholtz resonator, wherein the damping Helmholtz resonators are tuned to a second frequency which is different from the first frequency of the locking Helmholtz resonator.