Turbine Vane Baffle Chimney Cooling Airflow
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Solution Overview
Problem
Current cooling schemes for turbine vanes in gas turbine engines often disrupt the cooling air flow and impingement within the impingement cavity, leading to inefficiencies in cooling performance.
Innovation Solution
The design incorporates a chimney extending from a baffle tube through a cover plate with impingement holes, allowing cooling air to enter the baffle without impacting the air flow, and distributing it effectively to cool the turbine vane components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a baffle is placed in the internal core cavity to distribute cooling air, then cooling distribution is improved, but the cooling air flow and impingement in the platform cavity are disrupted
Solution Approach 1:
The baffle is divided into a baffle tube portion extending into the internal core cavity and a chimney portion extending through the platform cavity. This segmentation allows the baffle to perform dual functions: distributing cooling air within the airfoil section while maintaining proper airflow through the platform cavity via the chimney opening.
Solution Approach 2:
The chimney portion of the baffle acts as an intermediary element that connects the internal core cavity to the platform cavity. It allows cooling air to pass through the baffle while maintaining uninterrupted airflow through the platform cavity, preventing disruption to the impingement cooling system.
2Temperature
If cooling air is directed to the turbine vane, then cooling performance is improved, but the high temperatures of the exhaust gas flow cannot be withstood without effective cooling
Solution Approach 1:
The baffle is positioned to direct cooling air to specific critical areas within the internal core cavity, such as the leading edge region, where thermal stresses are highest. The chimney is positioned to allow cooling air to reach the platform cavity areas that require cooling, providing localized cooling where it is most needed.
Solution Approach 2:
Cooling air is introduced into the internal core cavity through the chimney before the hot exhaust gas contacts the airfoil wall. This preliminary cooling action establishes a protective thermal barrier that prevents the high-temperature exhaust gas from directly heating the airfoil 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
This design enhances cooling efficiency by maintaining air flow and effectively distributing cooling air to critical areas of the turbine vane, improving overall cooling performance without adverse effects on the cooling air flow.
Implementation Method 1
A chimney is connected to the first tube end and extends completely through the platform cavity... allowing cooling air to enter the baffle without impacting the air flow, and distributing it effectively to cool the turbine vane components
Implementation Method 2
Cooling air for cooling the turbine vanes and the turbine blades is generally bled from the compressor section and directed to the turbine vanes and the turbine blades
Data Source
AI summary
A turbine vane includes an airfoil section with an airfoil wall defining a leading edge and a trailing edge. A first side extends from the leading edge to the trailing edge and extends from a first end of the airfoil section to a second end of the airfoil section. A second side extends from the leading edge to the trailing edge and extends from the first end to the second end of the airfoil section. The airfoil wall also circumscribes an internal core cavity. A platform is attached to the first end of the airfoil section and a platform cavity is formed in the platform. A baffle is in the internal core cavity and includes a baffle tube extending from a first tube end to a second tube end. A chimney is connected to the first tube end and extends completely through the platform cavity.