GAS-TURBINE ENGINE DUCT NOISE-ABSORBING STRUCTURE Russian patent published in 2005 - IPC

FIELD: aircraft industry; gas-turbine engines.

SUBSTANCE: proposed noise-absorbing structure of duct of gas-turbine engine has wall of load-bearing housing, perforated duct wall, perforated wall is space out of duct and front and rear layers of cellular filler. Number of perforated walls in space out of duct is equal to or greater by one than number of layers of cellular fillers. Stops are installed between each pair of adjacent perforated walls arranged in space out of duct. Said stops are in contact with perforated walls and are secured by rows of fasteners connecting all layers, including wall of load-bearing-housing, perforated walls in space out of duct, layers of cellular fillers and perforated duct wall. Noise-absorbing structure is made in form of panel with cross and radial walls over perimeter of perforated walls in space out of duct. Buffer acoustic chamber is formed by pairs of perforated walls in contact with stops in space out of duct.

EFFECT: increased efficiency of noise-absorbing structure in turbofan aircraft engine without thrust losses.

2 cl, 6 dwg