Turbine Injector Centring Tabs Wear Reduction
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Solution Overview
Problem
Current turbine engine annular combustion chamber centring systems experience wear and misalignment issues due to free radial and rotational displacement of centring means, leading to reliability concerns and frequent maintenance needs.
Innovation Solution
The use of radially external tabs with circumferential recesses and bayonet fixing mechanisms limits angular displacement and reduces wear by securing the centring means on the supporting structure, ensuring precise positioning and reduced friction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If free radial and rotational displacement of centring means is allowed, then manufacturing tolerances and differential expansions are compensated, but substantial wear of the collar occurs and reliability decreases
Solution Approach 1:
The centring means are divided into multiple independent radial tabs (at least two) that can move relative to each other within their respective circumferential recesses. This segmentation allows the system to maintain overall centring function while distributing wear across multiple tabs and enabling selective replacement of individual worn tabs without replacing the entire centring assembly.
Solution Approach 2:
The radial tabs are designed with controlled mobility - they can slide radially to accommodate differential expansion and manufacturing tolerances, but their angular displacement is limited by circumferential abutment means. This dynamic design allows the system to adapt to thermal and manufacturing variations while preventing excessive wear through restricted rotational movement.
2Adaptability or versatility
If free rotational displacement of centring means is allowed, then differential expansions are compensated, but angular misalignment and wear increase
Solution Approach 1:
The radial tabs are designed with controlled mobility - they can slide radially to accommodate differential expansion and manufacturing tolerances, but their angular displacement is limited by circumferential abutment means. This dynamic design allows the system to adapt to thermal and manufacturing variations while preventing excessive wear through restricted rotational movement.
Solution Approach 2:
Different parts of the centring system have different degrees of freedom: the radial tabs can move radially to compensate for local thermal expansion, but their circumferential movement is constrained to maintain local angular alignment precision. This localized differentiation of mobility allows simultaneous adaptation and precision maintenance.
Data Source
AI summary
The invention relates to a device for supporting and centring a fuel injector in a turbine engine combustion chamber, which includes means for centring a fuel injector along an axis, which are movable in a plane that is radial to the centring axis (52) in supporting means intended for being attached to the bottom of an annular chamber (18). According to the invention, the centring means include at least two radially external tabs (54, 56) each inserted respectively in a circumferential recess (60, 64) of the supporting means, the device including circumferential abutment means (78, 80, 74, 76, 82, 86, 84, 88) of the radial tabs (54, 56) of the centring means in the circumferential recesses (60, 64), the circumferential abutment means being configured such as to enable a greater angular displacement of a first (54, 154) one of the radial tabs in a first circumferential recess (60) relative to a second (56, 156) one of the radial tabs in a second circumferential recess (64).