Cone-Shaped Pin Augmentors for Combustor Liner Cooling
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Solution Overview
Problem
Gas turbine engine combustor sections face challenges in efficiently managing high temperatures, particularly at higher altitudes where cooling air supply pressures decrease, leading to reduced heat transfer capabilities and potential decreased service life of liner panels.
Innovation Solution
The implementation of cone-shaped pin heat transfer augmentors on liner panels, which increase the surface area for heat transfer, promote turbulence, and enhance film cooling by directing cooling jets effectively through the combustor section, thereby improving the heat transfer coefficient and cooling effectiveness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional liner panels without augmentors are used, then the structure is simple and manufacturing is easier, but heat transfer capability is insufficient and service life decreases under high temperature conditions
Solution Approach 1:
The patent employs cone-shaped pin heat transfer augmentors with curved surfaces instead of flat or simple geometric shapes. These conical structures increase the surface area for heat transfer and promote turbulence in the cooling air flow, thereby enhancing heat transfer capability and extending liner panel service life under high temperature conditions.
Solution Approach 2:
The liner panel incorporates effusion passages that create a porous structure, allowing cooling air to pass through and form a protective film on the hot side. This porous architecture enables effective film cooling while maintaining structural integrity, directly contributing to improved service life.
2Temperature
If cooling air supply pressure is maintained at high altitudes, then heat transfer capability is preserved, but the energy consumption increases and system complexity increases
Solution Approach 1:
The patent changes the physical parameters of the heat transfer surface by incorporating cone-shaped pins that increase surface area and alter flow characteristics. This modification enables effective heat transfer at lower cooling air supply pressures, allowing the system to maintain heat transfer capability without requiring high pressure cooling air even at high altitudes.
Solution Approach 2:
The cone-shaped pin augmentors promote turbulence in the cooling air flow, creating chaotic flow patterns that enhance mixing and heat transfer. This turbulence effect improves heat transfer capability without requiring increased cooling air pressure, thereby reducing energy consumption for maintaining cooling at high altitudes.
3Temperature
If larger surface area for heat transfer is provided, then heat transfer coefficient increases, but the device complexity and manufacturing difficulty increase
Solution Approach 1:
The cone-shaped pin augmentors provide increased surface area through their conical geometry. While curved surfaces generally increase manufacturing complexity, the specific conical shape can be manufactured using standard machining or additive manufacturing processes, balancing heat transfer enhancement with manufacturing feasibility.
Solution Approach 2:
The heat transfer augmentation is achieved through multiple discrete pin structures distributed across the liner panel surface. This segmented approach allows the complex heat transfer function to be divided into many simple, identical elements that can be manufactured and assembled more easily than a single complex continuous 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
The cone-shaped pin heat transfer augmentors increase the heat transfer coefficient, reduce panel temperatures, and extend the service life of the liner panels by enhancing cooling efficiency, even under conditions of decreased cooling air supply pressures.
Implementation Method 1
increase the surface area for heat transfer... increase the heat transfer coefficient
Implementation Method 2
promote turbulence... enhancing film cooling by directing cooling jets effectively
Implementation Method 3
effusion cool the passages through the liner panels and film cool a hot side of the liner panels to reduce direct exposure to the combustion gases
Data Source
Figure 1
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AI summary
A liner panel for a combustor of a gas turbine engine includes a multiple of heat transfer augmentors. At least one of the multiple of heat transfer augmentors includes a cone shaped pin.