Turbine Vane Platform Sealing Assembly Leakage Prevention
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Solution Overview
Problem
Gas turbines face efficiency losses due to leakage of low-temperature, high-pressure compressed air into turbine vanes where high-temperature, low-pressure combustion gas flows, which reduces power generation efficiency.
Innovation Solution
A turbine vane platform sealing assembly is implemented, comprising a first sealing member inserted into a groove on the turbine vane platform, a second sealing member inserted into a perpendicular groove, and a third sealing member with an extension and bent part that contacts both, with a width greater than the first two members but smaller than the gap between vane platforms, to prevent air leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If compressed air is supplied to the turbine vane platform for cooling, then the turbine vane platform temperature is reduced, but compressed air leaks into the turbine vane where combustion gas flows, reducing power generation efficiency
Solution Approach 1:
The sealing assembly is divided into three distinct sealing members positioned at different locations and orientations. The first sealing member is inserted into a first groove, the second sealing member into a second groove intersecting at approximately 90 degrees, and the third sealing member connects both, creating segmented sealing zones that collectively prevent compressed air leakage while maintaining cooling function
Solution Approach 2:
Each sealing member has specific local properties optimized for its position: the first sealing member has a first width suitable for the first groove, the second sealing member has a second width for the second groove, and the third sealing member has a third width greater than both to ensure complete sealing at the intersection point where both grooves meet, creating different sealing qualities at different locations
2Device complexity
If a simple sealing structure is used, then device complexity is reduced, but sealing effectiveness is insufficient to prevent compressed air leakage
Solution Approach 1:
The three sealing members are nested within grooves of the turbine vane platform, with the first and second sealing members positioned in perpendicular grooves and the third sealing member bridging both, creating a nested configuration where simpler individual components work together to achieve complex sealing functionality
Solution Approach 2:
The sealing assembly utilizes three-dimensional spatial arrangement by positioning the first and second sealing members in perpendicular directions (first direction and second direction intersecting at approximately 90 degrees), with the third sealing member connecting both dimensions, transforming a potential single-direction sealing problem into a multi-dimensional sealing solution
Data Source
AI summary
Proposed is a turbine vane platform sealing assembly in which compressed air is prevented from leaking to a turbine vane to improve power generation efficiency. The turbine vane platform sealing assembly includes a first sealing member inserted into a first groove formed in a turbine vane platform in a first direction, the first sealing member extending in the first direction, a second sealing member inserted into a second groove formed in a second direction intersecting the first direction of the turbine vane platform, with an end part of the second sealing member being in contact with an upper surface of the first sealing member, and the third sealing member having a portion formed by extending in the first direction and a remaining portion formed by bending in the second direction at a bend line at which the first sealing member and the second sealing member contact.