Burner Tip Heat-Conducting Structures for Thermal Stress Reduction
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Solution Overview
Problem
The service life of burner tips in gas turbines is limited by the heat shield's ability to withstand combustion heat, leading to thermal stress and premature degradation.
Innovation Solution
Attaching heat-conducting structures to the outer wall of the burner tip, which protrude into the annular space, increases the surface area for heat transfer, allowing for enhanced cooling and reducing thermal loads on the outer wall, while connecting webs between the outer and inner walls facilitate even heat distribution and mechanical stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the outer wall is designed as a heat shield to withstand combustion heat, then the thermal stress resistance is improved, but the service life is limited due to thermal stress and premature degradation
Solution Approach 1:
The patent transitions from a smooth two-dimensional outer wall surface to a three-dimensional structured surface with protrusions and cavities. This dimensional change increases the surface area by a factor of 1.5 to 3 times, enabling more effective heat dissipation through the annular space while maintaining the same wall thickness, thereby extending service life without compromising thermal stress resistance
Solution Approach 2:
The outer wall is designed with a porous-like structure consisting of protrusions and cavities that create additional surface area. This structured surface acts similarly to porous materials by providing numerous pathways and surfaces for heat transfer to the cooling air in the annular space, improving thermal management and extending component durability
2Temperature
If the surface area of the outer wall is increased to improve heat transfer, then the cooling efficiency is improved, but the structural complexity increases
Solution Approach 1:
The outer wall surface is segmented into multiple protrusions and cavities rather than being a continuous smooth surface. This segmentation creates discrete heat transfer zones that can be optimized independently, increasing overall surface area and cooling efficiency while maintaining a modular structure that is manageable in terms of manufacturing and design
3Temperature
If heat-conducting structures are attached to the outer wall to increase surface area, then the heat transfer is improved, but the device complexity increases
Solution Approach 1:
The heat-conducting structures are merged with the outer wall to form an integrated component rather than separate attached parts. The protrusions and cavities are formed as inherent features of the outer wall structure itself, eliminating the need for separate heat-conducting attachments and reducing overall device complexity while maintaining enhanced heat transfer performance
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 solution extends the service life of the burner tip by improving cooling efficiency, reducing thermal stress, and ensuring more even heating, thereby enhancing the component's durability and performance.
Implementation Method 1
heat-conducting structures that increase the surface area of the outer wall available for heat transfer
Implementation Method 2
air flowing through the annular space absorbs heat from the outer wall via convection
Implementation Method 3
heat-conducting structures connect the outer and inner walls, enabling heat to be conducted from the outer wall to the inner wall
Data Source
Figure 1
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AI summary
Various embodiments include a burner tip for installing in a burner comprising: an air passage system open to the surrounding area of the burner tip; a fuel passage system open to the surrounding area of the burner tip; an inner wall and an outer wall; an annulus between the inner wall and the outer wall; and heat-conducting structures projecting into the annulus from the outer wall connecting the outer wall and the inner wall. The annulus forms a part of the air passage system. The heat-conducting structures include connecting ribs. Connecting passages extend through the connecting ribs, open on one end into the annulus and on another end through the outer wall.