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Combustion chamber seal segments equipped with damping devices

A damper and damping technology, applied in combustion chambers, combustion equipment, combustion methods, etc., can solve problems such as difficult installation, and achieve the effect of increasing the number, increasing the potential of high-frequency damping, and widening design flexibility

Active Publication Date: 2014-12-10
ANSALDO ENERGIA IP UK LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Can sometimes be difficult to install due to their location

Method used

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  • Combustion chamber seal segments equipped with damping devices
  • Combustion chamber seal segments equipped with damping devices
  • Combustion chamber seal segments equipped with damping devices

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Embodiment Construction

[0032] theory

[0033] There are several types of acoustic dampers such as quarter wave tubes, Helmholtz dampers or acoustic screens. We will focus on Helmholtz dampers.

[0034] When air is forced into the cavity, the pressure inside the cavity increases. When the external force pushing air into the cavity is removed, the higher pressure air inside will flow out. The cavity will stay at a slightly lower pressure than the outside, causing air to be sucked back. The process repeats, each time the magnitude of the pressure change decreases.

[0035] The air in the port (the neck of the chamber) has mass. Because it's in motion, it has some momentum. Longer ports contribute to greater mass and vice versa. The cross-sectional diameter of the port is related to the mass of air and the volume of the chamber. A port with an area that is too small for the chamber volume will "stuck" the airflow, while a port with an area that is too large for the chamber volume tends to reduc...

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Abstract

A strip seal arrangement (100) for turbine components employs acoustic damping. A sealing plate (110) having a front face (119) adjacent a combustion chamber (60) and a back face (121) facing away from a combustion chamber configured to have one or more holes (151) of a predefined cross-sectional area. Containers (155) having predefined volumes are attached to the back face (121) of the sealing plate (110) such that the one or more holes (151) are in fluidic communication with the one or more containers (155) thereby creating at least one acoustic damper (150). The side edges of the sealing plate (110) fit into a slots (31) of burner front panels (20), creating a seal between the panels (20).

Description

technical field [0001] The present invention relates to the field of gas turbines, and more particularly to gas turbine combustors having one or more tuned damping devices included in combustor seals to suppress high frequency thermoacoustic induced pressure oscillations. Background technique [0002] Gas turbine combustors can cause gas pressure (acoustic) and temperature oscillations during operation. These are especially problematic for lean premixed, low emission combustors. [0003] When the frequency of these thermo-acoustic combustion oscillations is matched to one or more acoustic resonance frequencies of the combustor volume, the oscillations are amplified. These pressure and thermal variations can cause mechanical and thermal damage to the turbine. They can also limit the usable range of the turbine. [0004] Such oscillations have been a well-known problem since the early days of gas turbine development. A possible way to suppress this oscillation consists in ...

Claims

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Application Information

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IPC IPC(8): F23R3/00
CPCF23R3/002F23R2900/00014F23R2900/00012F23M99/005F23M20/005Y10T29/49323F02C7/24B23P19/04
Inventor J.德荣格A.胡伯B.舒尔曼斯U.本兹
Owner ANSALDO ENERGIA IP UK LTD