Transition Duct Exit Frame Geometry for Exhaust Gas Ingestion Control
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Solution Overview
Problem
The ingestion of exhaust gas into the gap between the transition duct and turbine inlet in gas turbine engines leads to inefficiencies and increased emissions, necessitating improved design to minimize gas ingestion and enhance performance.
Innovation Solution
A transition duct with a liner and exit frame featuring specific panel configurations and bumps to direct exhaust gas efficiently into the turbine section, reducing gas ingestion and enhancing the use of purge air.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the transition duct has a simple outlet opening configuration, then the device complexity is reduced, but exhaust gas ingestion into the gap increases
Solution Approach 1:
The outlet opening is segmented into multiple sections with different radial positions (inner radius, middle radius, outer radius) and axial positions. Bumps are strategically placed at specific segments to control exhaust gas flow in different regions, preventing ingestion into the gap while maintaining a relatively simple overall structure.
Solution Approach 2:
Different regions of the outlet opening have different structural characteristics. Bumps are placed only at specific locations (inner radius, middle radius, outer radius) rather than uniformly across the entire outlet. This local modification optimizes exhaust gas flow control where needed while keeping other regions simple.
2Object-generated harmful factors
If bumps are added to the exit frame to control exhaust gas flow, then exhaust gas ingestion is reduced, but the device complexity increases
Solution Approach 1:
The exit frame is divided into multiple panels (first side panel, second side panel, outer diameter panel, inner diameter panel) with bumps placed at specific panel locations. This segmentation allows precise control of exhaust gas flow at different radial positions while maintaining manufacturability through modular panel construction.
Solution Approach 2:
Instead of trying to prevent exhaust gas ingestion through complex sealing mechanisms or active control systems, the invention uses simple geometric bumps that passively redirect the exhaust gas flow away from the gap. This inverted approach simplifies the solution by using basic geometric features rather than complex mechanisms.
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 reduces exhaust gas ingestion into the gap, improving combustor performance and reducing emissions by optimizing the flow of purge air, thereby enhancing the overall efficiency of the gas turbine engine.
Implementation Method 1
A transition duct with a liner and exit frame featuring specific panel configurations and bumps to direct exhaust gas efficiently into the turbine section, reducing gas ingestion
Data Source
AI summary
A transition duct includes a liner defining an inlet opening and an outlet opening, and an exit frame connected to the liner and disposed around a perimeter of the outlet opening. The exit frame includes a first side panel, a second side panel, an outer diameter panel disposed between the first side panel and the second side panel, an inner diameter panel disposed between the first side panel and the second side panel, and a middle bump extending from the inner diameter panel toward the outer diameter panel.