Gas Turbine Combustor Liner Fixture Cooling for Hot Head Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The existing fixtures for attaching liners in gas turbine combustors experience non-uniform heating, with the head exposed to the combustion chamber tending to increase in temperature significantly.
Innovation Solution
A combustor design featuring a fixture with a shaft portion penetrating the outer wall, a head supporting the liner, and an air passage connected to the combustion chamber, which includes a shape corresponding to the head, allowing for cooling air to flow through and reduce temperature increase.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the head of the fixture is exposed to the combustion chamber to support the liner, then the liner can be properly positioned and supported, but the head temperature increases significantly due to non-uniform heating
Solution Approach 1:
An air passage is introduced as an intermediary cooling mechanism between the combustion chamber and the head. Cooling air flows through this passage to directly cool the head, preventing excessive temperature rise while maintaining the head's structural integrity and liner support function.
Solution Approach 2:
The invention utilizes pneumatic cooling by introducing cooling air through a dedicated air passage. The pressurized cooling air flows through the passage to remove heat from the head, applying fluid dynamics principles to solve the thermal management problem.
2Temperature
If the head thickness is reduced to lower temperature, then the cooling efficiency improves, but the structural strength may be compromised
Solution Approach 1:
The air passage is strategically positioned within the head structure to provide localized cooling where temperature rise is most severe. This allows for optimized thermal management without uniformly reducing head thickness, maintaining structural strength in critical areas while improving cooling efficiency in hot spots.
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 design effectively suppresses the temperature increase of the head by reducing its thickness and increasing the contact area with cooling air, thereby maintaining the fixture's integrity and performance.
Implementation Method 1
an air passage that is in the fixture, is connected to the combustion chamber, and has a shape corresponding to a shape of the head
Implementation Method 2
suppresses a temperature increase of especially a head of a fixture
Data Source
AI summary
A combustor of a gas turbine according to one aspect of the present disclosure includes: an outer wall surrounding a combustion chamber; a liner located inside the outer wall and facing the combustion chamber; and a fixture that attaches the liner to the outer wall in a state where there is a gap between the outer wall and the liner. The fixture includes: a shaft portion penetrating the outer wall; a head supporting the liner; and an air passage that is in the fixture, is connected to the combustion chamber, and has a shape corresponding to a shape of the head.