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Device for reducing noise from jet-pylon interactions on jet engines

An engine and hanger technology, which is applied to jet power units, exhaust ports of power units, drag reduction, etc., and can solve the problems of not solving noise problems, not solving problems

Active Publication Date: 2012-11-14
SN DETUDE & DE CONSTR DE MOTEURS DAVIATION S N E C M A
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, they do not solve the problem of noise generated during takeoff by, or related to, the velocity shear between the hot and cold streams of a twin-flow (bypass) or triple-flow turbojet engine

Method used

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  • Device for reducing noise from jet-pylon interactions on jet engines
  • Device for reducing noise from jet-pylon interactions on jet engines
  • Device for reducing noise from jet-pylon interactions on jet engines

Examples

Experimental program
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Effect test

Embodiment Construction

[0031] refer to figure 1 , figure 1 Shown is an engine 1 of the twin-flow or bypass turbojet type, from which there emerges a main or hot flow 2 and a secondary or bypass flow, also called cold flow 3 . The hot flow leaves the engine 1 at the primary exhaust pipe 4 , while the cold flow exits at the secondary exhaust pipe 5 . The engine 1 is connected via a supporting pylon 7 to the wing 6 of an aircraft (not shown). The pylon 7 is generally flat in shape, having an upper surface connected to the aircraft, shown here as two sides generally perpendicular and parallel to each other, and a lower or bottom surface. rectifier 20, in Figure 5 As can be seen in , a connection is formed between the side of the pylon 7 and the top of the main exhaust duct 4 to ensure a clean aerodynamic flow at the junction between these two elements. The pylon 7 extends longitudinally, ie in the direction of air flow around the engine, downstream of the exit faces of the exhaust pipes 4 and 5 of ...

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PUM

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Abstract

The invention relates to an aircraft pylon for mounting a dual- or triple-flow jet engine (1), said pylon comprising an upper surface for connection to the aircraft, two side flanks, and a flange on the lower portion of the pylon. Said pylon includes at least one portion that extends downstream from the cold flow nozzle (5) of said jet engine and lies in the cold flow. Said pylon is characterized in that it comprises, on the portion thereof extending into the cold flow beyond said nozzle, at least one opening (8), positioned on one of the flanks of said pylon, by means of which an air stream is injected into or drawn from the gas flow that flows along the flanks of the pylon.

Description

technical field [0001] The field of the invention is the field of civil aviation, in particular the field of noise generated by aircraft. Background technique [0002] The noise produced by commercial aircraft, especially during takeoff, is well known to be very annoying and many innovations have been conceived in an attempt to reduce it. A major source of this noise comes from the engine jets, which are used at full power during takeoff. Apparently a lot of work has been done to try and reduce the noise coming from aircraft jets, such as fitting sawtooth chevrons to exhaust pipes, whether that's for the hot gases generated from the main flow through the engine, or for what's called Exhaust pipe for cold gases originating from the engine's secondary or bypass stream. [0003] In order to limit the nuisance to living and working in the vicinity of the airport, strict standards are imposed to limit the noise perceived at different points located around the aircraft, at diffe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B64C7/02B64C21/02B64D27/40
CPCB64C7/02B64C21/02Y02T50/166B64D33/06B64D27/18Y02T50/10
Inventor 艾伦·布莱维特杰克斯·米歇尔·阿尔伯特·茱莉亚皮埃尔·飞利浦·玛丽·罗海克
Owner SN DETUDE & DE CONSTR DE MOTEURS DAVIATION S N E C M A