Turbomachine Combustion Chamber Flange Triangular Orifices
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Solution Overview
Problem
Combustion chambers for turbomachines face a trade-off between maximizing air flow area and minimizing pressure drop while maintaining good vibration resistance and circumferential stiffness, which existing rectangular and circular orifices fail to achieve effectively.
Innovation Solution
The combustion chamber features annular flanges with triangular orifices, optimized in shape and arrangement to provide a large air flow area, reduced mass, and enhanced vibration resistance, along with improved circumferential stiffness, achieved through a staggered and imbricated configuration with zig-zag material strips.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of moving object
If rectangular orifices are used in flanges, then air flow area is increased and mass is reduced, but vibration resistance deteriorates
Solution Approach 1:
The patent applies asymmetry by using triangular orifices instead of symmetric rectangular or circular shapes. The triangular geometry with rounded apexes creates an asymmetric form that optimizes both flow area and structural strength, resolving the contradiction between maximizing air flow and maintaining vibration resistance.
Solution Approach 2:
The patent changes the geometric parameters of the orifices from rectangular to triangular shape, and further optimizes by rounding the apexes. This parameter transformation allows the orifices to achieve both large flow area and good vibration resistance simultaneously, addressing the technical contradiction.
2Reliability
If circular orifices are used in flanges, then vibration resistance is improved, but air flow area is reduced and pressure drop increases
Solution Approach 1:
The patent moves away from the symmetric circular shape to an asymmetric triangular configuration. This asymmetric design allows the orifices to achieve better flow characteristics with larger effective area while maintaining structural integrity and vibration resistance through the triangular geometry and rounded apexes.
Solution Approach 2:
The patent transforms the orifice geometry from circular to triangular with rounded apexes, optimizing the parameters to simultaneously achieve large air flow area, low pressure drop, and good vibration resistance, thereby resolving the contradiction between flow performance and structural strength.
3Weight of stationary object
If rectangular orifices are used in flanges, then mass is reduced, but circumferential stiffness deteriorates
Solution Approach 1:
The patent uses asymmetric triangular orifice shapes instead of rectangular configurations. The triangular geometry with rounded apexes and zig-zag arrangement of material strips provides optimized structural distribution that maintains circumferential stiffness while minimizing flange mass.
Solution Approach 2:
The patent introduces dimensional complexity by arranging triangular orifices in a zig-zag pattern and using rounded apexes, transforming the simple rectangular configuration into a multi-dimensional optimized structure that enhances circumferential stiffness without increasing mass.
Data Source
AI summary
Combustion chamber for a turbomachine, comprising a chamber endwall equipped with fuel injection means and axisymmetric walls connecting the chamber endwall to internal and external flanges for fastening to internal and external casings, these flanges including annular portions pierced by orifices of triangular or approximately triangular shape for the flow of air for cooling downstream components.