Unlock instant, AI-driven research and patent intelligence for your innovation.

Acoustic treatment panel for turbojet engine

一种声学处理、涡轮喷气的技术，应用在发动机制造、发动机功能、机器/发动机等方向，能够解决衰减频率带宽不利、声音发射频率变化等问题

Pending Publication Date: 2021-05-11
SAFRAN AIRCRAFT ENGINES SAS
View PDF5 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] This limitation on the frequency bandwidth of the attenuation is very disadvantageous, since the variation of the speed of the fan according to the phase of flight and the weight of the aircraft can significantly change the frequency of its sound emissions
Therefore, sizing in this way is only effective in a very narrow range of speeds

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Acoustic treatment panel for turbojet engine
  • Acoustic treatment panel for turbojet engine
  • Acoustic treatment panel for turbojet engine

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0033] figure 1 A sectional view of a turbojet 1 according to an embodiment of the invention is represented in a longitudinal plane of the turbojet 1 .

[0034] The turbojet engine 1 comprises a nacelle 2 , an intermediate casing 3 and an inner casing 4 . The nacelle 2 and the two casings 3 and 4 are coaxial. The nacelle 2 defines a fluid flow inlet channel 5 at a first end and a fluid flow exhaust channel 6 at a second end opposite the first end. The nacelle 2 and the intermediate housing 3 delimit between them a main fluid flow path 7 . The intermediate housing 3 and the inner housing 4 delimit between them a secondary fluid flow path 8 . The primary flow path 7 and the secondary flow path 8 are arranged between the inlet channel 5 and the exhaust channel 6 in the axial direction of the turbojet.

[0035] The turbojet engine 1 also comprises a fan 9 configured to deliver as a fluid flow an air flow F that is divided at the outlet of the fan into a main flow F circulating...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

An acoustic absorption cell (18), comprising a bottom wall (180) extending in a plane orthogonal to an axial direction (DA), an enclosure (185) comprising a first axial end (1850) rigidly connected to the bottom wall (180), and an acoustic horn (30) extending inside the enclosure (185) between a first orifice (31) of the horn (30) and a second orifice (32) of the horn (30) which is smaller than the first orifice (31), the horn (30) being rigidly connected to a second axial end (1855) of the enclosure (185) opposite the first axial end (1850), and the first and second orifices (31, 32) of the horn (30) each extending in a plane which is orthogonal to the axial direction (DA). The horn (30) comprises at least one retaining tab (35, 350) which projects from the horn (30) inside the enclosure (185) and is attached to the bottom wall (180) or to the enclosure (185).

Description

technical field [0001] The present invention relates to an acoustic treatment panel for absorbing sound waves, and more particularly, to an acoustic absorption unit for an acoustic treatment panel for absorbing sound waves at low and middle frequencies. Background technique [0002] Acoustic absorption units are designed to reduce unwanted noise. There are various reasons for this reduction, such as to protect one's ears from damage or to reduce the effects of noise. In technical components and equipment, acoustic protection may be required to prevent them from being damaged (hearing fatigue). Due to the high noise generated during takeoff, hearing fatigue may occur, for example, on the landing flaps of the aircraft near the engines or on the payload components of the space launch system. [0003] Typically, the noise of turbojet engines, and more precisely the noise radiated due to the interaction between the rotor and its surroundings, is reduced using absorptive panels ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): G10K11/172
CPCG10K11/172F02C7/045F02K1/827F05D2250/131F05D2250/141F05D2260/963B32B3/12B32B3/266B32B15/20B32B5/02B32B2260/02B32B2260/046B32B2605/18B32B2307/102Y02T50/60F02C7/24F05D2220/323F05D2260/96
Inventor G·J·X·利欧J·P·F·冈萨雷斯J·N·马德乔诺
Owner SAFRAN AIRCRAFT ENGINES SAS