Patent ID: 8904795

Claim:
A noise reducing device in a jet engine that has a cylindrical casing positioned to have a longitudinal extent along a central axis line and having a trailing edge, a cylindrical partition wall inside the cylindrical casing while protruding partially from the trailing edge of the cylindrical casing, and a compressor that compresses air that is taken into the cylindrical partition wall, with an inside of the cylindrical partition wall configured as a duct for a flow of a core stream of high-speed air exiting at a core stream discharge outlet, and a space between the cylindrical partition wall and the cylindrical casing configured as a duct for a flow of a bypass stream of low-speed air, and a pylon connecting the jet engine to a wing of an airplane, the pylon having a projection portion that includes a downstream end portion positioned so as to be stream further aft along the central axis direction than the core stream discharge outlet, the noise reducing device comprising: a nozzle directly attached to the downstream end portion of the projection portion of the pylon, the nozzle positioned and configured to inject a fluid toward a noise generation source, a noise produced from a mutual approach of an ambient air stream that is produced outside of the bypass stream and the core stream of high-speed air.