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:
Mar. 23, 1999
Filed:
Feb. 04, 1998
Walter M Presz, Jr, Wilbraham, MA (US);
Gary Reynolds, Westfield, MA (US);
Stage III Technologies, L.C., Las Vegas, NV (US);
Abstract
A mixer/ejector suppressor is disclosed for reducing the noise level created by the exhaust flows in gas turbines. In the preferred embodiment, the suppressor comprises a mixing ring of alternating lobes attached to the engine's tailpipe; an ejector shroud mounted onto the mixing ring; and a plurality of arcuate gaps, between the mixing ring and ejector shroud, that permit ambient air to be entrained into the shroud. The preferred mixing ring has ten curved lobes of alternating designs. Five of the mixing lobes are shallow, with contours similar to those of mixing lobes in an earlier TSMEC version, disclosed in a related U.S. utility patent application, Ser. No. 08/729,571. The other five lobes are much longer, and they are designed to penetrate deeply into the engine's hot core flow. Together, the ten lobes rapidly mix (mostly at supersonic conditions) the engine exhaust flows with secondary ambient air inside the shroud. The lobes thereby increase the spread rate of the exhaust jet, dissipate its velocity and greatly decrease the core length of the exhaust jet. Hence, noise levels are reduced, which enable older engines to meet new federal noise regulations, known as 'Stage 3', at static and takeoff conditions. This suppressor, known as the 'ALMEC,' comprises an improvement in noise reduction over the prior TSMEC version.