Segmented Bore Basket for Gas Turbine Rotor Cooling
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Solution Overview
Problem
Gas powered turbines face heat sensitivity issues in rotor bores due to direct exposure to hot air flows, which can reduce performance and require effective cooling solutions.
Innovation Solution
A bore basket design comprising a radially outward and inward cylinder with radially aligned openings and an axially aligned gap, facilitating cool air injection to cool rotor bores while isolating them from hot air flows, using mechanical interconnections and structural struts for stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a single metal cylinder bore basket is used to shield rotor bores from hot air, then heat protection is provided, but cooling efficiency is reduced due to insufficient cool air flow distribution
Solution Approach 1:
The bore basket is segmented into multiple cylindrical sections (first cylinder, second cylinder, third cylinder) arranged axially. Each section contains cooling channels that distribute cool air independently, allowing optimized cooling flow paths while maintaining heat shield functionality. This segmentation enables both effective heat protection and enhanced cooling efficiency simultaneously.
2Strength
If the bore basket is constructed as a single integrated component, then structural strength is maintained, but manufacturing complexity and assembly difficulty increase
Solution Approach 1:
The bore basket is divided into multiple separable cylindrical sections that can be manufactured independently using standard machining processes. Each section contains integrated cooling channels, allowing for simplified manufacturing and quality control. The sections are then assembled together using mechanical connections, reducing overall manufacturing complexity while maintaining structural integrity through proper joint design.
Solution Approach 2:
The cylindrical sections are designed to nest within each other or connect in a telescoping arrangement, with each section containing cooling channels that align when assembled. This nested configuration allows the complex multi-channel cooling system to be built from simpler individual components, easing manufacturing while preserving the integrated cooling functionality and structural strength.
3Productivity
If cooling channels are integrated within the bore basket walls, then cooling efficiency is improved, but device complexity increases
Solution Approach 1:
The cooling system is segmented into multiple independent cooling channels distributed across different cylindrical sections. Each channel is integrated into the wall structure of its respective section, allowing cool air to be distributed efficiently along the bore basket length. The segmentation approach simplifies the integration process compared to creating a single complex multi-channel structure, as each section can be designed and manufactured with its own straightforward cooling channels.
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
Effectively cools rotor bores by directing cool air through the bore basket, reducing heat exposure and maintaining performance by preventing hot air from contacting sensitive rotor components.
Implementation Method 1
facilitating cool air injection to cool rotor bores while isolating them from hot air flows
Implementation Method 2
isolating them from hot air flows, using mechanical interconnections and structural struts for stability
Data Source
AI summary
Gas turbine engines include bore baskets to facilitate rotor bore cooling. One such bore basket for utilization in a gas turbine engine includes two cylinders that guide a cooling flow through a bore opening. The cylinders define an axially aligned gap that further directs fluid flow when a cooling fluid is injected into the system.