Filter Mound for Gas Turbine Cooling Holes
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Solution Overview
Problem
In gas turbines, debris entering cooling passages can disrupt the cooling process of hot gas path components, leading to potential operational interruptions and maintenance challenges, especially in components with complex arrangements of small cooling holes.
Innovation Solution
The integration of a filter mound with strategically positioned holes and additional blockage structures, such as pedestals and circumferential raised rings, over the cooling air supply holes, formed during additive manufacturing, to prevent debris from entering and clogging the cooling passages while allowing air to flow effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If filters are added to cooling air supply holes, then debris blocking is improved, but device complexity increases
Solution Approach 1:
The filter mound is integrated directly into the cooling air supply hole structure, merging the filtering function with the cooling hole itself. This eliminates the need for separate filter components while maintaining debris prevention capability, thus improving reliability without proportionally increasing device complexity
Solution Approach 2:
The filter mound utilizes a porous structure with multiple small holes that allow cooling air to pass through while blocking debris particles. This porous design provides effective filtration within a compact form factor, addressing the contradiction between reliability improvement and complexity increase
2Manufacturing precision
If conventional manufacturing methods are used, then manufacturing precision is achieved, but device complexity increases and waste material is generated
Solution Approach 1:
The filter mound and cooling air supply hole are formed simultaneously during the additive manufacturing process itself, rather than requiring post-manufacturing operations. This preliminary action integrates multiple features into a single manufacturing step, reducing overall process complexity while maintaining precision
Solution Approach 2:
The patent replaces conventional mechanical machining methods with additive manufacturing technology. This substitution eliminates the need for complex drilling, milling, or tapping operations for creating cooling holes and filter structures, significantly reducing manufacturing process complexity while achieving high precision
Data Source
AI summary
A gas turbine component includes a turbine component having an outer wall and an internal cooling passage; a cooling air supply hole through the outer wall in fluid communication with the internal cooling passage; and a filter mound disposed over the cooling air supply hole. The filter mound includes a filter mound wall projecting from the turbine component and defining an interior of the filter mound. At least one hole in the filter mound wall extending through the filter mound wall is configured to permit cooling air supply to pass therethrough while blocking debris from passing through the interior of the filter mound and clogging the cooling air supply hole in fluid communication with the internal cooling passage. The turbine component and the filter mound are formed during manufacturing of the turbine component.