Turbine Vane Cooling Channel Web Head Flow Separation
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Solution Overview
Problem
High-temperature turbine blades with internal cooling systems face flow separation issues at deflection points, reducing cooling performance and turbine blade service life.
Innovation Solution
The design incorporates a flow channel with alternating channel sections and deflectors featuring web heads that reduce flow cross-section, accelerating the cooling fluid and minimizing separation, along with strategically placed inlet and outlet openings for optimized flow management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the flow channel deflects the cooling fluid flow direction, then the cooling fluid can reach different areas of the turbine blade, but flow separation occurs at the deflection point reducing cooling performance
Solution Approach 1:
The web head is positioned upstream of the deflector to pre-accelerate the cooling fluid flow before it reaches the deflection point. This preliminary acceleration ensures that the flow maintains sufficient momentum to negotiate the direction change without separating, thus preserving cooling effectiveness while achieving flow direction adaptability.
Solution Approach 2:
The invention changes the flow velocity parameter by reducing the flow cross-section at the web head section. This parameter change (increasing velocity) occurs precisely where needed - upstream of the deflector - allowing the flow to successfully navigate the direction change without separation, resolving the contradiction between flow direction versatility and cooling reliability.
2Stability of the object's composition
If the flow channel has a larger flow cross-section, then the cooling fluid flow is smoother, but the flow velocity is reduced decreasing cooling efficiency
Solution Approach 1:
The web head creates a localized reduction in flow cross-section specifically at the upstream region of the deflector, while the rest of the flow channel maintains its original cross-section. This local quality change accelerates the flow only where needed to prevent separation, without disrupting the overall smooth flow characteristics in other regions, thus resolving the contradiction between flow smoothness and velocity.
3Speed
If the web head extends into the first channel section, then the flow cross-section is reduced accelerating the flow, but the channel geometry becomes more complex
Solution Approach 1:
The web head is integrated as an extension of the wall structure rather than being a separate component. This merging of the web head with the existing wall geometry simplifies manufacturing while achieving the desired flow cross-section reduction and velocity increase, resolving the contradiction between flow acceleration and geometric complexity.
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 minimizes flow separation and enhances cooling performance, thereby extending the service life and efficiency of the turbine blade by ensuring continuous and accelerated coolant flow through the internal channels.
Implementation Method 1
the wall forms a web head that extends at least with a web head section into the region of the first channel section and thereby reduces the flow cross-section of the flow channel in a specific manner as intended. This accelerates the flow of the cooling fluid upstream of the deflector.
Implementation Method 2
High-temperature turbine blades with internal cooling often suffer from flow separation in the areas where the flow channel or the flow direction of the cooling fluid is deflected. The possible separation of the cooling air flow at the inlet to the next flow channel section reduces the cooling performance
Implementation Method 3
a cooling system for actively cooling the turbine blade with a cooling fluid via an internal flow channel formed in the turbine blade
Data Source
Figure 1
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AI summary
The invention relates to a cooling system (1) for actively cooling a turbine blade (2) with a cooling fluid via an internal flow channel (3) formed in the turbine blade (2), which extends from an inlet edge (4) to an outlet edge (5) and comprises a first channel section (6) defining a first flow direction, a second channel section (7) defining a second flow direction, a wall (8) located between the first and second channel sections (6, 7) and a deflector (9) between the first and second channel sections (6, 7) which is configured to transfer the flow from the first to the second flow direction, characterized in that the wall (8) forms a rib head (10) in the region of the deflector (9), which extends at least with a rib head section into the region of the first channel section (6) and thereby reduces the flow cross-section of the flow channel (3).