Gas Turbine Combustion Liner Textured Surface Heat Transfer
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing gas turbine combustion liners face challenges in achieving uniform heat transfer across their surfaces while maintaining structural integrity and component life, particularly in high-temperature environments, and existing heat transfer augmentation methods can disrupt cooling hole definitions and processing requirements.
Innovation Solution
A combustion liner with a textured outer surface featuring a substantially uniform pattern of intersecting grooves, which increases the surface area and enhances heat transfer without compromising cooling efficiency or affecting cooling hole integrity, achieved through techniques like pressure tooling or machining.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a coating is applied to the liner wall backside to turbulate cooling air and improve heat transfer, then heat transfer efficiency is improved, but cooling hole definition and processing are disrupted
Solution Approach 1:
The invention divides the heat transfer enhancement function into separate segments: the cooling holes remain intact and unobstructed for proper air flow, while the heat transfer augmentation is achieved through discrete ribs or protrusions that extend into the cooling air path without blocking hole definitions or processing operations.
Solution Approach 2:
The invention applies heat transfer augmentation features (ribs or protrusions) only in specific locations where cooling air passes over the liner wall, rather than applying a coating across the entire surface. This localized approach enhances heat transfer where needed while preserving cooling hole integrity and processing capability.
2Temperature
If thermal barrier coating is applied to the inner surface, then thermal protection is improved, but heat transfer through the liner wall is reduced
Solution Approach 1:
The invention applies different surface treatments to different locations: the inner surface receives thermal barrier coating for thermal protection, while the outer surface receives heat transfer augmentation features (ribs or protrusions) to enhance cooling. This localized differentiation allows both thermal protection and heat transfer enhancement to coexist.
Solution Approach 2:
The invention segments the liner wall into distinct functional zones: the inner surface zone for thermal barrier coating and the outer surface zone for heat transfer augmentation. This segmentation allows each zone to perform its specific function without interfering with the other.
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 textured pattern provides improved heat transfer by increasing the surface area and turbulence of the cooling medium, resulting in more uniform cooling and reduced operating temperatures, while preventing flame attachment during potential flashbacks.
Implementation Method 1
The textured pattern provides improved heat transfer by increasing the surface area and turbulence of the cooling medium
Implementation Method 2
for a given amount of cooling fluid passing over the liner outer surface, heat transfer is improved
Data Source
AI summary
A combustion liner having enhanced heat transfer over at least a portion of the liner is disclosed. The combustion liner comprises, amongst other features, an outer surface wherein at least a region of the outer surface is textured in a substantially uniform pattern such that the surface area exposed to a passing cooling medium is increased, thereby increasing the heat transfer through the combustion liner. Multiple embodiments of textured patterns are also disclosed.