Afterburning chamber of a gas turbine engine

 

Afterburning chamber of the gas turbine engine has established in the case of the front unit ring stabilizers, flame, placed at the exit of the diffuser formed by his body and fairing turbine rear bearing support. Before the front device is a device for suppressing vibrations made in the form of a number of acoustic waveguides, indicating peripheral zone of the gas cavity of the camera. The length of the acoustic waveguide is determined from the protected invention. The invention simplifies the design and reduces the weight of afterburners due to the suppression of the 1st and 2nd modes tangential oscillations. 1 C.p. f-crystals, 3 ill.

The invention relates to aircraft engine industry, namely to design afterburners GTE.

Known afterburning chamber of a gas turbine engine, comprising a housing and installed in it the front of the device with the annular flame stabilizers and anti-vibration-screen TV mounted on the body (1).

The disadvantage of it is the damping of pressure fluctuations in a narrow range of frequencies.

Known afterburning chamber of a gas turbine engine containing installed in the hull front is anenome in the form of a hollow fairing turbine rear bearing support with the holes on it in the form of two sections in front of and in the plane of the front of the device, forming with the camera body o-ring diffuser (2).

Such a device the energy absorber of vibrations is difficult to manufacture and has considerable weight.

The objective of the invention is to simplify the design and reduce weight afterburners.

To achieve this task in the afterburner of a gas turbine engine containing within the enclosure of the front unit ring stabilizers, flame, placed at the exit of the diffuser, formed his body and fairing turbine rear bearing support, before the front device is a device for suppressing vibrations made in the form of a number of acoustic waveguides, indicating peripheral zone of the gas cavity of the chamber, with the length of the acoustic waveguide is determined from the relation

wherethe wavelength of the tangential vibration modes.

In addition, the acoustic waveguides are located in a transverse plane afterburners and made at least three pipelines.

New here is the fact that before the front device is a device for suppressing vibrations made in the form of a number of acoustic waveguides reporting �c="https://img.russianpatents.com/img_data/77/779971.gif">wherethe wavelength of the tangential vibration modes.

Acoustic waveguides are located in the transverse plane and made at least three pipelines.

Calculating the length of the acoustic waveguide, we can run the device for suppressing vibrations by the interference of acoustic waves vibratory combustion and thus to provide afterburners without regular oscillations in the range of operating modes. The device required for this purpose, a more simple and less weight.

It provides an objective of the invention to simplify the construction and reduce weight afterburners.

In Fig.1 shows a longitudinal section afterburners;

in Fig.2 is a transverse section of the camera along a-a with the acoustic waveguide to suppress the 1st tangential fashion;

in Fig.3 is a transverse section of the camera along a-a with the acoustic waveguide to suppress the 2nd tangential fashion.

Afterburning chamber contains installed in the front housing 1, the device 2 with the annular flame stabilizers 3, placed at the exit of the diffuser 4, formed by the housing 1 and 5 rear fairing support 6 turbine 7. Before the front USB 9, informing the peripheral area 10 of the gas cavity of the chamber 11. Acoustic waveguides 9 are made of pipes 12.

In this case, 13 is the calculated length of the acoustic waveguide 9 in an arc.

When working afterburners when the vibration mode of combustion occur periodic fluctuations in pressure and speed with one of the modes of tangential vibrations of the camera. In this case, the gas performs a periodic motion along a certain trajectory in the tangential direction actually afterburners 11 and installed it in a certain way acoustic waveguides 9 (pipelines). For any fashion tangential vibrations of the camera, the length of the corresponding pipe 12 is approximately one and a half times the wavelength of the vibration and, consequently, on the output of the pipe 12 waves interact in opposite phase and suppress each other due to the interference of acoustic waves vibratory combustion and thus provide effective suppression of acoustic oscillations in a wide range of operating modes afterburners.

Sources of information

1. Skubachevskii, S. Aviation gas turbine engines, Design and calculation details, 1969, S. 445.

2. RF patent №2117806, F 02 3/is containing a series set in the case of the front unit ring stabilizers, flame, placed at the exit of the diffuser formed by his body and fairing turbine rear bearing support, characterized in that before the front device is a device for suppressing vibrations made in the form of a number of acoustic waveguides, indicating peripheral zone of the gas cavity of the chamber, with the length of the acoustic waveguide is determined from the relation

wherethe wavelength of the tangential vibration modes.

2. Afterburner chamber under item 1, characterized in that the acoustic waveguides are located in a transverse plane afterburners and made at least three pipelines.

 

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FIELD: turbojet engines.

SUBSTANCE: proposed afterburner of double-flow turbojet engine contains prechamber with ring flame stabilizers arranged at outlet of diffuser formed by its housing and fairing of rear support of turbine, lobe-type mixer of flows of outer and inner loops secured on support. Periphery part of afterburner and space of outer loop communicate through at least three half-wave acoustic waveguides. Outputs of half-wave acoustic waveguides are arranged in plane of prechamber, and inputs, before mixer. Length of acoustic waveguides is determined by protected invention.

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3 cl, 4 dwg

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