Gas Turbine Combustion Liner Stop Vibration Damping
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Solution Overview
Problem
Existing combustion liner stops in gas turbine engines face challenges with alignment during assembly, excessive wear due to vibration and heat, leading to misalignment, premature failure, and frequent maintenance needs.
Innovation Solution
The introduction of a liner stop system comprising a female saddle component, a male tab component, and a vibration-damping insert, allowing for easy alignment and retention of the combustion liner within the flow sleeve, with the insert providing increased damping of vibrations and wear mitigation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If prior liner stops are used without vibration damping, then the structure is simple, but excessive wear occurs due to vibration and heat causing misalignment and premature failure
Solution Approach 1:
The liner stop incorporates a composite structure with a female component, a male component, and a vibration-damping insert. This composite design combines materials with different properties: the metal components provide structural strength while the insert provides vibration damping, resolving the contradiction between reliability and complexity by using material composition rather than structural complexity alone
Solution Approach 2:
The vibration-damping insert acts as an intermediary element between the male and female components. It mediates the vibration and dynamic forces that would otherwise cause excessive wear and misalignment, allowing the simple two-component structure to be enhanced without significant complexity increase
2Strength
If liner stops are designed for high strength to withstand vibration and heat, then durability is improved, but manufacturing complexity increases
Solution Approach 1:
The liner stop is segmented into three separate components: a female component, a male component, and a vibration-damping insert. This segmentation allows each component to be manufactured independently using appropriate processes and materials, then assembled together. The female and male components can be manufactured with high strength properties to withstand vibration and heat, while the insert can be manufactured separately and inserted into the assembly
Solution Approach 2:
The vibration-damping insert is nested within the male or female component structure. The insert is inserted into a recess or cavity in one of the main components, creating a nested configuration. This nesting allows the high-strength components to be manufactured with the necessary strength properties while the insert is easily installed, maintaining ease of manufacture
3Manufacturing precision
If liner stops allow self-alignment during assembly, then alignment precision is improved, but the hula seal interferes with stop insertion
Solution Approach 1:
The female component is preliminarily installed on the liner before the male component is inserted. This preliminary installation establishes the correct position and alignment references before the male component with the insert is inserted into the flow sleeve. The pre-installed female component acts as a guide, ensuring that when the male component is inserted, self-alignment occurs without interference from the hula seal
Solution Approach 2:
The vibration-damping insert serves as an intermediary that facilitates the insertion process. By providing a damping interface, it allows the male component to be inserted smoothly into the flow sleeve even in the presence of the hula seal, enabling self-alignment to occur without the interference problems that plague traditional liner stop designs
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
This solution facilitates easier assembly, reduces wear-related issues, and enhances the durability of combustion components by maintaining alignment and distributing dynamic forces effectively, thereby reducing maintenance needs and preventing premature failure.
Implementation Method 1
an insert adapted for being attached onto the tab and providing increased damping of vibrations when the tab is disposed within the saddle
Data Source
AI summary
A liner stop for retaining a liner within a sleeve of a combustion system, includes: a female component including a saddle, the female component adapted for coupling to one of the liner and the sleeve; a male component including a tab for insertion into the saddle, the male component adapted for coupling to an opposite one of the liner and the sleeve; and an insert adapted for being attached to the tab and ensuring dampening of vibration when the tab is disposed within the saddle. A method and a system are also disclosed.