United Technologies Corporation

John C Simonich

Robert Hans Schlinker

Satish Narayanan

Wesley K Lord

Gregory A Kohlenberg

Ramons Andris Reba

Marios C Soteriou

Kenneth A Kousen

Joseph M Verdon

Thierry Maeder

An exhaust nozzle for use in a gas turbine engine comprises a flow body for receiving exhaust gas from the turbine engine and includes a leading edge and a trailing edge. The leading edge connects with the gas turbine engine such that the flow body surrounds a centerline of the engine. The trailing edge comprises a serrated portion and a non-serrated portion. The serrated portion is formed from a plurality of tabs for mixing exhaust gas exiting the flow body with gases passing by an exterior of the flow body. The non-serrated portion is positioned along a lower portion of the trailing edge with respect to the engine centerline.

Asymmetric serrated nozzle for exhaust noise reduction

A system for reducing jet noise emission from an internally mixed gas turbine engine exhaust, comprising a fan/core flow mixer having a plurality of mixer lobes and a common flow nozzle having an equal number of tabs located along a circumferential edge of an aft end of the nozzle. There is a predetermined clocking relationship between the plurality of mixer lobes and the plurality of nozzle tabs that results in reduced exhaust noise emission, most evident in the lower frequency range. A method for reducing jet noise emission from an internally mixed gas turbine engine exhaust comprises selectively aligning a circumferential distribution of a mixed flow vorticity field produced by a fan/core mixer with a circumferentially distributed exhaust flow vorticity field produced by a modified common flow nozzle at an exit plane of the engine exhaust.

Jet exhaust noise reduction system and method

An arrangement for cancelling unwanted noise generated by sequential blade rows (16, 18) in a gas turbine engine (10) includes a plurality of acoustic sources (52) disposed on the blades (36-42) of the downstream row (18).

Anti-sound arrangement for multi-stage blade cascade

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Glastonbury, CT, United States of America

John C Simonich