Tubular Combustor Slits and Radial Throttle Pieces
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Solution Overview
Problem
In combustors where the tubular body and transition piece are formed integrally, it is difficult to install an outlet throttle due to the lack of separation between the two components, and in newly-built gas turbines, installing a throttle at a midway position is hindered by limited workspace, obstructing performance improvement.
Innovation Solution
A combustor design featuring a tubular body with slits and throttle pieces or a throttle ring that can be easily fitted to promote circulating flows, along with an acoustic damper to manage temperature and prevent unburned carbides, allowing for improved performance without requiring complex disassembly or precise alignment of cooling flow paths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the tubular body and transition piece are formed integrally, then the structural strength and simplicity are improved, but the ease of installing outlet throttle deteriorates
Solution Approach 1:
The invention segments the outlet throttle into multiple independent throttle pieces that can be separately installed into slits formed in the tubular body. This allows the throttle to be installed without separating the integrally-formed tubular body and transition piece, thus maintaining structural strength while improving installability.
2Productivity
If the outlet throttle is installed at a midway position away from the opening end, then the combustion performance is improved, but the ease of installation deteriorates due to limited workspace
Solution Approach 1:
The invention changes the installation dimension from axial (approaching from the opening end) to radial (approaching from the outer circumferential side through slits). This allows the throttle to be installed at a midway position where combustion performance is improved, while overcoming the limited axial workspace by accessing the throttle pieces radially through the slits.
3Productivity
If the outlet throttle is provided to improve combustion performance, then the efficiency is improved, but the device complexity increases
Solution Approach 1:
The invention merges the outlet throttle function with the tubular body structure by forming slits directly in the tubular body and fitting throttle pieces into them. This integration approach improves combustion efficiency while minimizing additional complexity, as the throttle components are incorporated into the existing structural framework rather than being separate add-on elements.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The design enables easy installation of throttling components to enhance combustor performance by forming circulating flows and suppressing unburned carbide formation, improving efficiency and workability even in constrained spaces.
Implementation Method 1
The combustion gas that flowed through the inside of the tubular body from the upstream side toward the downstream side collides with the outlet throttle to change the flow direction and head toward the upstream side again. A circulating flow of the combustion gas is thereby formed inside the tubular body.
Implementation Method 2
it is known that since the air leaks from the damping space of the acoustic damper, the temperature of the combustion gas is lowered in the region near the acoustic damper.
Data Source
AI summary
A combustor (3) includes: a fuel nozzle configured to inject fuel; a tubular body (24) having a tubular shape in which a combustion region through which combustion gas flows is formed inside, and in which a plurality of slits (50) are formed extending in the circumferential direction at intervals in the circumferential direction; and throttle pieces (60) which are fitted into the slits (50), project radially inward from the inner circumferential side of the tubular body (24), and have a throttle face that extends along the flow direction of the combustion gas as it extends from the radially outer side inward.