Gas Turbine Blade Cooling Film Stability via Counter Vortex Generation
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Solution Overview
Problem
In gas turbines, the generation of vortexes between cooling fluid and working fluid impairs the cooling film formation on blade surfaces, leading to reduced cooling efficiency and potential thermal damage.
Innovation Solution
A vortex relief generator, such as opposing fins, is disposed on the inner periphery of gas holes to generate counter vortexes that collide with interaction vortexes, stabilizing the flow and enhancing cooling film formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If cooling fluid is discharged onto the blade surface to form a cooling film, then the blade surface is cooled and protected from thermal damage, but vortexes are generated between cooling fluid and working fluid that impair cooling film formation and reduce cooling efficiency
Solution Approach 1:
The patent converts the harmful vortexes generated by cooling fluid discharge into beneficial counter-vortexes that suppress the harmful interaction vortexes. The vortex relief generator intentionally creates counter-rotating vortexes that collide with and neutralize the harmful interaction vortexes between cooling fluid and working fluid, thereby improving cooling film formation and cooling efficiency while maintaining blade surface temperature control
Solution Approach 2:
The vortex relief generator is positioned at the outlet of the cooling fluid discharge hole to generate counter-vortexes in advance before the harmful interaction vortexes fully develop. This preliminary anti-action occurs at the source of vortex generation, where the counter-vortexes immediately suppress the formation of harmful interaction vortexes between cooling fluid and working fluid, preventing cooling efficiency degradation before it occurs
2Temperature
If multiple gas holes are provided to ensure adequate cooling coverage, then cooling coverage is improved, but the number of holes increases which may reduce blade stiffness and increase manufacturing complexity
Solution Approach 1:
By converting harmful interaction vortexes into beneficial counter-vortexes through the vortex relief generator, the patent improves cooling film formation quality. This allows for more effective cooling with fewer gas holes, as each hole produces a more stable and effective cooling film without the detrimental effects of interaction vortexes, thereby reducing blade structure complexity while maintaining adequate cooling coverage
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 solution improves cooling efficiency by stabilizing the flow of cooling fluid, reducing the number of gas holes needed, and enhancing the stiffness and cost-effectiveness of the blade.
Implementation Method 1
a vortex relief generator disposed so as to protrude from an inner periphery of the outlet and configured to generate counter vortexes having directionality opposite to the interaction vortexes so that the interaction vortexes are relieved by collision with the counter vortexes
Implementation Method 2
discharge the cooling fluid onto the surface of the blade to cool the blade by forming a cooling film on the blade surface
Data Source
AI summary
A structure for improving performance of cooling a blade of a gas turbine is provided in which interaction vortexes are generated between working fluid flowing along a surface of the blade and cooling fluid discharged onto the surface from an internal flow passage of the blade. The blade includes a surface structure formed by a gas hole having an outlet communicating with the surface of the blade to discharge the cooling fluid; and a vortex relief generator disposed so as to protrude from an inner periphery of the outlet and configured to generate counter vortexes having directionality opposite to the interaction vortexes so that the interaction vortexes are relieved by collision with the counter vortexes. The vortex relief generator includes a pair of opposing fins disposed in a path of the cooling fluid, each of which has a first surface to change a flow direction of the cooling fluid.