Gas Turbine Stator Blade Cooling Structure for Leakage Control
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Solution Overview
Problem
The existing gas turbine stator blade design in PTL 1 suffers from cooling air leakage between separate rib-shaped walls and inserts, reducing the effectiveness of impingement cooling.
Innovation Solution
A gas turbine stator blade design with an integrally formed leading edge portion partition wall and negative pressure surface-side partition wall, incorporating a tube-shaped pressure surface-side insert with gaps for cooling air to reuse cooling air for dual-stage impingement cooling, eliminating the need for separate members and reducing air leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate rib-shaped walls and inserts are used to guide cooling air, then the cooling air flow can be directed, but cooling air leaks from gaps between separate members reducing impingement cooling effectiveness
Solution Approach 1:
The partition wall and insert are integrated into a single integral structure, eliminating gaps between separate members. This merging of components prevents cooling air leakage while maintaining the flow direction guidance function, thereby improving impingement cooling effectiveness and reducing energy loss from air leakage.
2Quantity of substance
If cooling air is reused for dual-stage impingement cooling, then the cooling air amount required is reduced, but the system complexity increases
Solution Approach 1:
The internal cavity is segmented into multiple regions (first cavity, second cavity, third cavity) using partition walls with integrated inserts. This segmentation enables the cooling air to flow sequentially through different stages, allowing reuse of cooling air for dual-stage impingement cooling while organizing the complexity into structured, manageable sections.
Solution Approach 2:
The integral structure of partition walls and inserts serves multiple functions: it guides cooling air flow, creates pressure differential regions, enables dual-stage impingement cooling, and prevents air leakage. This multi-functionality reduces the need for additional components, thereby reducing cooling air requirements without proportionally increasing system complexity.
3Ease of manufacture
If partition walls are formed integrally with the blade body, then manufacturing complexity is reduced, but the flexibility to adjust cooling air flow paths is limited
Solution Approach 1:
The partition walls and inserts are formed as an integral structure with the blade body, simplifying manufacturing by reducing the number of separate components. The integrated design maintains adaptability through strategically positioned impingement cooling holes and gap regions that enable flexible cooling air flow path configuration within the unified structure.
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 design effectively reduces the cooling air amount required, enhances impingement cooling efficiency, and suppresses thermal damage by reusing cooling air for dual-stage cooling, while maintaining high pressure to prevent combustion gas ingress.
Implementation Method 1
a pressure surface-side impingement cooling hole for cooling the pressure surface forming wall... a negative pressure surface-side impingement cooling hole for cooling the negative pressure surface forming wall
Implementation Method 2
at least a part of cooling air passing through the pressure surface-side impingement cooling hole is configured to cool the negative pressure surface forming wall by passing through the first gap, the second gap, and the negative pressure surface-side impingement cooling hole
Data Source
AI summary
A gas turbine stator blade includes a leading edge portion partition wall divides an in-blade cavity into a leading edge-side cavity and a trailing edge-side cavity, a negative pressure surface-side partition wall formed integrally with the blade body, divides the leading edge-side cavity into a negative pressure surface-side cavity and a pressure surface-side cavity, and is formed with a negative pressure surface-side impingement cooling hole, and a tube-shaped pressure surface-side insert inserted into the pressure surface-side cavity to provide a first gap between the pressure surface forming wall and the pressure surface-side insert and a second gap between the negative pressure surface-side partition wall and the pressure surface-side insert and is formed with a pressure surface-side impingement cooling hole. A part of cooling air cools the negative pressure surface forming wall by passing through the first gap, the second gap, and the negative pressure surface-side impingement cooling hole.