Air Flow Guide Cap for Gas Turbine Combustion Duct Cooling
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Solution Overview
Problem
Current air flow induction methods, such as the scoop, are insufficient to handle increased combustion heat and output in gas turbine engines, leading to inefficient cooling of combustion duct components due to turbulence and limited air volume induction.
Innovation Solution
The design of an air flow guide cap with an upwardly inclined upper surface and a downwardly extending wall surface, combined with a protrusion member that fits into the through holes, to increase the cross-sectional area of the inlet and guide air flow vertically, reducing turbulence and ensuring stable airflow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If a scoop is used to induce air flow into through holes, then air volume induction is improved, but turbulence occurs and cooling efficiency becomes insufficient for high combustion heat
Solution Approach 1:
The air flow guide cap employs a curved upper surface design that guides air flow smoothly into the through hole. The curved surface shape redirects the air flow direction gradually, preventing sudden flow direction changes that cause turbulence, thereby maintaining reliable cooling efficiency while still inducing sufficient air volume.
Solution Approach 2:
The air flow guide cap adds a vertical dimension to air flow induction by extending upward from the sleeve surface. This three-dimensional structure creates an additional flow path dimension, allowing air to be induced from both horizontal and vertical directions, increasing total air volume while maintaining smooth flow transition through the curved upper surface.
2Productivity
If the inlet cross-sectional area is increased to enhance air flow rate, then cooling air flow rate improves, but the structure becomes more complex
Solution Approach 1:
The air flow guide cap is divided into distinct functional segments: a vertical cylindrical portion extending from the sleeve, an upper curved surface for flow guidance, and a protrusion member for mounting. This segmentation allows each part to perform its specific function efficiently while keeping the overall structure manageable and not excessively complex.
Solution Approach 2:
The air flow guide cap serves multiple functions simultaneously: it increases the inlet cross-sectional area for higher air flow rate, guides air flow smoothly to reduce turbulence, and provides a mounting structure via the protrusion member. This multi-functionality achieves enhanced productivity without proportionally increasing structural complexity.
3Quantity of substance
If air flow is induced horizontally, then air volume is increased, but uniform cooling distribution along the combustion duct is compromised
Solution Approach 1:
The curved upper surface of the air flow guide cap gradually redirects air flow from horizontal induction to vertical downward flow. This curved transition ensures uniform distribution of air flow along the combustion duct length, preventing concentrated cooling in specific areas and achieving uniform cooling distribution while still inducing sufficient air volume horizontally.
4Quantity of substance
If the scoop shape is enlarged to increase air induction, then air volume improves, but turbulence increases and cooling effectiveness decreases
Solution Approach 1:
The air flow guide cap uses a curved upper surface design that provides a smooth, gradual transition for air flow direction change. This curved geometry prevents sudden flow direction changes that generate turbulence, allowing the structure to be sufficiently large for high air volume induction while maintaining laminar flow and avoiding turbulence-related cooling effectiveness degradation.
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 enhances the flow rate of cooling air, ensures uniform cooling distribution along the combustion duct, and improves the mounting efficiency of the air flow guide caps, providing effective cooling without turbulence and unequal distribution.
Implementation Method 1
an upwardly inclined upper surface and a downwardly extending wall surface, combined with a protrusion member that fits into the through holes, to increase the cross-sectional area of the inlet and guide air flow vertically, reducing turbulence and ensuring stable airflow
Implementation Method 2
The air induced into the sleeve 4 cools the transition piece 3 and the liner 2 while ascending toward the burner 1
Implementation Method 3
proper cooling because it is a path for a flow of the combustion gas of high-temperature
Data Source
Figure 1
Figure 2~3B
Figure 4~5
AI summary
Disclosed is a combustion duct assembly (6) of a gas turbine engine in which air flows on the surface and which has a plurality of through holes (7) for inducing air; and a plurality of air flow guide caps (10) for inducing the air flow into the through holes of the floor. Each air flow guide cap includes an upper surface (20) upwardly inclined relative to a horizontal plane, and a wall surface (30) downwardly extending along edges of the upper surface except the edge adjacent to an air inlet (32).