Combustion Liner Axial Stop Brackets for Low-Blockage Mounting
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Solution Overview
Problem
In gas turbine engines, the combustor liner is prone to axial movements and vibrations due to the geometry of the flow sleeve peg and combustion liner tab, leading to wear and airflow blockage, which increases maintenance costs and emissions.
Innovation Solution
A mounting system with liner stop brackets is introduced, featuring mounting tabs with varying widths and pegs with slots, along with liner stop brackets that secure to the flow sleeve flange, reducing movement and airflow disturbances by increasing contact area and minimizing blockage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a flow sleeve peg and combustion liner tab configuration is used to locate the combustion liner, then the liner can be positioned in the desired location, but the liner is prone to axial movements and vibrations causing wear and airflow blockage
Solution Approach 1:
The retention system is divided into multiple components: mounting tabs on the liner, pegs with slots in the flow sleeve, and liner stop brackets. This segmentation allows each component to perform a specific function - the tabs and pegs provide positioning while the stop brackets prevent excessive movement, reducing vibrations and wear.
Solution Approach 2:
Liner stop brackets are introduced as intermediary components between the combustion liner and flow sleeve. These brackets act as mediators that limit axial movement of the liner relative to the flow sleeve, thereby reducing vibrations and wear on the interface region without compromising the positioning function.
2Reliability
If the flow sleeve peg geometry is used to retain the combustion liner, then the liner can be secured, but compressed air flow is blocked and combustion dynamics are affected
Solution Approach 1:
The liner stop brackets are designed with specific local geometries - the arm contact surface is positioned to limit liner movement while the bracket width is optimized to minimize interference with compressed air flow. This local quality optimization allows the retention function to be maintained while reducing airflow blockage in the surrounding passage.
3Ease of manufacture
If the combustion liner is allowed slight axial movements, then assembly is simpler, but wear and vibratory motion occur between components
Solution Approach 1:
The system allows for controlled axial movement through the slot geometry in the pegs while the liner stop brackets provide a dynamic limit to this movement. The brackets can accommodate normal thermal expansion and assembly tolerances but prevent excessive movement that would cause wear, thus maintaining reliability while preserving ease of assembly.
Data Source
AI summary
An apparatus and method for mounting a combustion liner within a flow sleeve of a gas turbine combustion system is disclosed. A mounting system comprises a plurality of low-profile mounting tabs secured to a combustion liner where each of the mounting tabs are placed within slots of flow sleeve pegs when the combustion liner is installed in a flow sleeve. A plurality of liner stop brackets are removably secured to a flange of the flow sleeve and have an arm extending to be adjacent to a top contact surface of the mounting tabs. The mounting system reduces blockage to the surrounding airflow.