Fuel Injector Downstream Plate Cooling Flow Path Design
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Solution Overview
Problem
The existing fuel injector designs for gas turbines may experience attached flames on the downstream plate, necessitating efficient cooling to prevent damage and ensure stable combustion.
Innovation Solution
A fuel injector design incorporating a downstream plate with a cooling air introduction system, where cooling air flows through a dedicated path along the plate surface, directly cooling the high-temperature areas and potentially reducing the plate thickness, while reusing discharged cooling air within the premix tube, thus simplifying the structure and enhancing cooling efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If cooling air is blown out from the outside of the downstream plate, then the downstream plate can be cooled, but a large amount of cooling air is required and the structure becomes more complex
Solution Approach 1:
The invention extracts the cooling function from the external environment and integrates it into the downstream plate structure itself by forming cooling flow paths within the plate. This allows cooling air to be directed through internal channels rather than requiring large external airflow, thereby reducing the total quantity of cooling air needed while maintaining effective cooling of the downstream plate.
Solution Approach 2:
The cooling flow paths act as intermediaries between the cooling air source and the downstream plate. By introducing cooling air through air inlet holes into these internal flow paths, the system efficiently transfers cooling air to the critical areas of the downstream plate without requiring direct external blowing, thus reducing the overall cooling air quantity required.
2Temperature
If cooling air is blown out from the outside of the downstream plate, then the downstream plate can be cooled, but the structure becomes more complex due to additional plenums
Solution Approach 1:
The invention merges the cooling air introduction function directly into the downstream plate by forming cooling flow paths within the plate structure itself. The air inlet holes and internal flow paths are integrated into the downstream plate, eliminating the need for separate external plenums and complex cooling air distribution systems, thereby simplifying the overall fuel injector structure.
Solution Approach 2:
The invention extracts the cooling air distribution function from external plenums and integrates it directly into the downstream plate structure. By forming cooling flow paths within the downstream plate and introducing cooling air through air inlet holes, the system eliminates the need for separate cooling air plenums, thereby simplifying the overall structure.
3Reliability
If the downstream plate thickness is increased to prevent attached flames, then the plate can withstand higher temperatures, but the cooling efficiency is reduced and the structure becomes more massive
Solution Approach 1:
The invention extracts the cooling function from external systems and integrates it directly into the downstream plate by forming internal cooling flow paths. This allows even thinner plates to be effectively cooled from the inside, maintaining attached flame resistance while improving cooling efficiency and reducing the need for excessive plate thickness.
Solution Approach 2:
The cooling flow paths act as intermediaries that deliver cooling air directly to the interior surfaces of the downstream plate. This internal cooling mechanism allows the plate to maintain lower temperatures and resist attached flames effectively, even with reduced thickness, thereby improving cooling efficiency without compromising reliability.
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 effectively cools the downstream plate using a minimal amount of cooling air, stabilizing combustion and reducing the risk of attached flames, leading to a more efficient and stable operation of the gas turbine.
Implementation Method 1
a cooling flow path which extends in a direction along a surface of the downstream plate from the air inlet so as to avoid the premix tube
Implementation Method 2
since the cooling flow path through which the cooling air flows is provided in the downstream plate having a high temperature, the downstream plate can be directly cooled with the cooling air
Implementation Method 3
a fuel hole introducing the fuel gas supplied into the plenum is formed, wherein the fuel gas is to mixed with air introduced from the upstream opening end in the premix tube
Implementation Method 4
the combustor generates a high-temperature combustion gas
Data Source
AI summary
The present invention is a downstream plate which is provided on a downstream side of an upstream plate includes an air inlet into which cooling air is introduced from a cooling air introduction pipe and a cooling flow path which extends in a direction along a surface of the downstream plate from the air inlet so as to avoid a premix tube and through which cooling air flows.