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 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 Central area of the fairing. The length of the acoustic waveguide is determined from the ratio ofwhere- wavelength radial oscillation modes. The invention allows to simplify the design and reduce the weight of the afterburner. 1 C.p. f-crystals, 2 Il.

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 afterburner Luggage ha is mi flame, located coaxially vibration absorber is made 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 Central area of the fairing, while the length of the acoustic waveguide is determined from the relation

where- wavelength radial oscillation modes.

In addition, the acoustic waveguides are located in the transverse plane and is m what about the 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 Central area of the fairing, while the length of the acoustic waveguide is determined from the relation

where- wavelength radial oscillation 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 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 is to simplify the design and reduce weight afterburners.

In Fig.1 shows a longitudinal section afterburners; Fig.2 is a transverse section of the camera along a-a with acoustic waveguides.

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, Obrosova 8 for oscillation suppression made in the form of a number of acoustic waveguides 9, indicating peripheral area 10 of the gas cavity of the chamber 11 with the Central area 12 of the fairing 5. Acoustic waveguides 9 are made of pipes 13. In this 14 - length of the diffuser 4 along the longitudinal axis 15 is the calculated length of the acoustic waveguide 9 in an arc.

When working afterburners when the vibration mode of combustion occur periodic oscillations of pressure and speed with one of the modes of radial vibrations of the camera. In this case, the gas performs a periodic motion along a certain trajectory in the radial direction actually afterburners 11 and installed it in a certain way acoustic waveguides 9 (pipelines). For any fashion radial vibrations of the camera, the length of the corresponding pipe 15 is approximately one and a half times the wavelength of the oscillations along the axis 14 and due to this, the output of the pipe 15 waves interact in opposite phase, extinguish 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. Scuba, F 02 K 3/10, 1995.

Claims

1. Afterburning chamber of a gas turbine engine containing installed in the housing of the front unit ring stabilizers, flame, placed at the exit of the diffuser, formed 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 Central area of the fairing, while the length of the acoustic waveguide is determined from the relation

where- wavelength radial oscillation modes.

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

 

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