Combustor Tile Holder With Segmented Cooling Holes
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Solution Overview
Problem
Existing combustor tile arrangements face challenges in achieving even cooling due to difficulties in providing cooling holes around or through bolts, leading to inefficient heat protection and thermal expansion issues.
Innovation Solution
A combustor design featuring a tile holder with an elongate retaining head and discrete securing portions, including bolt protrusions with cooling holes, that securely attach to the combustor lining, allowing for even distribution of cooling air and accommodating thermal expansion without gaps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If cooling holes are provided around or through bolts to secure tiles, then cooling of combustor tiles is improved, but manufacturing complexity and cost increase significantly
Solution Approach 1:
The system is divided into separate functional components: the tile holder body and the bolt assembly. The cooling holes are provided in the tile holder body rather than in the bolts, segmenting the cooling function from the fastening function. This allows each component to be manufactured independently with appropriate cooling features without the complexity of providing cooling holes through bolt structures.
Solution Approach 2:
The tile holder body acts as an intermediary component between the combustor lining and the tiles. It provides the cooling holes and serves as the mounting structure for the bolts, mediating between the cooling requirement and the fastening requirement without requiring complex integrated solutions.
2Strength
If integral studs are provided on tiles to secure them to combustor lining, then tile attachment is improved, but even cooling across the tile cannot be achieved
Solution Approach 1:
The attachment function is segmented from the cooling function. The tile holder body provides the cooling holes and structural support, while separate bolts provide the attachment function. This segmentation allows the cooling holes to be distributed evenly across the tile holder body without being constrained by bolt locations.
Solution Approach 2:
The bolts are extracted from the tile structure and placed in the tile holder body instead. This removes the constraint that cooling holes must be provided through or around bolts, allowing for optimal cooling hole distribution across the entire tile holder body surface.
3Adaptability or versatility
If gaps are provided in combustor tile arrangement to accommodate thermal expansion, then thermal expansion is accommodated, but cooling efficiency is reduced
Solution Approach 1:
The system incorporates dynamic elements that allow for thermal expansion while maintaining cooling efficiency. The bolts with threaded portions and nuts allow for adjustable positioning, and the tile holder body can accommodate movement without creating gaps that would disrupt cooling airflow.
Solution Approach 2:
The tile holder body acts as a flexible mounting structure that can accommodate thermal expansion of the tiles. The retaining head and bolt assembly provide a flexible connection that allows for movement while maintaining continuous contact and cooling coverage.
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 design ensures more efficient cooling of combustor tiles by allowing even cooling air distribution and reducing thermal expansion disruptions, enhancing the overall heat management and operational efficiency of the combustor.
Implementation Method 1
These tiles typically comprise effusion cooling holes in the surface to allow a film of cooling air to flow over the surface of the combustor tiles to cool them in use
Implementation Method 2
allow a film of cooling air to flow over the surface of the combustor tiles to cool them
Implementation Method 3
to protect the lining of the combustor and other components, such as pressure casings, from the heat of the combustion within a combustion chamber
Data Source
Figure 1~2
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AI summary
There is disclosed a combustor comprising a combustor lining, a tile comprising a recess at an end defining a receiving surface, and a tile holder. The tile holder comprises an elongate retaining head having a combustor surface configured to face a combustion chamber of a combustor, and a securing portion extending from the head, the securing portion being configured to secure the head to a combustor lining. The retaining head extends laterally with respect to an elongate direction of the retaining head to define a retaining surface laterally adjacent to the securing portion; and the retaining surface cooperates with the receiving surface of the tile to retain the tile against the combustor lining. There is also disclosed a tile holder and a tile.