Gas Turbine Stator Vane Cooling and Inspection Access
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Solution Overview
Problem
The challenge in gas turbine stator vanes is to enhance durability while allowing for inspection with an inspection probe without compromising cooling efficiency.
Innovation Solution
The design incorporates a shroud with a recess and an impingement plate forming a cavity, featuring through holes with varying opening ratios and diameters to optimize cooling and accommodate inspection, where a second region with a higher opening ratio and larger diameters is strategically placed around the communication hole for the inspection device, ensuring efficient cooling and durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Difficulty of detecting and measuring
If a communication hole is provided in the impingement plate for inserting an inspection probe, then inspection capability is improved, but cooling efficiency deteriorates due to reduced opening ratio
Solution Approach 1:
The impingement plate is divided into different regions with varying opening ratios. The first region (peripheral area) has a higher opening ratio to maintain cooling efficiency, while the second region (central area) has a lower opening ratio to accommodate the communication hole for inspection. This local differentiation allows each region to optimize its function - cooling in the first region and inspection access in the second region - thereby resolving the contradiction between inspection capability and cooling efficiency.
2Reliability
If the opening ratio of through holes in the impingement plate is increased to improve cooling efficiency, then cooling performance is improved, but durability deteriorates due to increased thermal strain on the shroud
Solution Approach 1:
The impingement plate employs regional differentiation in opening ratios. The first region (peripheral area) maintains a higher opening ratio to ensure adequate cooling efficiency, while the second region (central area) has a lower opening ratio to reduce thermal strain on the shroud and improve durability. This spatial variation in opening ratio allows the system to simultaneously achieve both cooling efficiency and durability requirements.
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 effectively maintains cooling efficiency and improves durability by ensuring adequate cooling around the inspection device, preventing thermal strain and simplifying machining instructions.
Implementation Method 1
a flow path through which a cooling medium flows is formed
Implementation Method 2
the stator vane is cooled by air or the like
Data Source
AI summary
A stator vane includes a blade body, an outer shroud, and an impingement plate. The outer shroud includes a recess. The impingement plate forms a cavity inside the recess. A communication hole is provided in the impingement plate and the outer shroud. In the impingement plate, a plurality of through holes through which an outer space and a cavity communicate with each other are formed. A second region in which an opening ratio is large and a first region in which an opening ratio is small exist in a surface of the impingement plate.