Turbomachine Combustion Chamber Bayonet Mounting for Baffle Retention
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Solution Overview
Problem
The existing combustion chambers in turbomachines face the risk of baffle detachment during operation, leading to potential damage to downstream components like the turbine due to differential expansion, which is not effectively addressed by conventional designs.
Innovation Solution
A bayonet-type mounting system is introduced, where the injection system has projecting parts that engage with recessed parts on the baffle, ensuring axial holding and preventing separation, even if the baffle or sleeve detaches from the bottom wall, thus preventing damage to downstream components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the baffle is mounted on the sleeve and bottom wall using conventional methods, then the structure is simple, but the baffle may detach during operation causing damage to downstream components
Solution Approach 1:
The mounting system allows the injection system to rotate from a first angular position during assembly to a second angular position for operational holding, transforming a static mounting problem into a dynamic solution that achieves both ease of assembly and reliable retention
Solution Approach 2:
The projecting part of the injection system nests into the recessed part of the baffle, creating an interlocking mechanism where one component fits within a feature of another component, providing secure retention without complex fastening systems
2Object-affected harmful factors
If the baffle is securely fixed to prevent detachment, then downstream components are protected, but the mounting system becomes more complex
Solution Approach 1:
The mounting system is segmented into distinct functional elements: the projecting part on the injection system, the recessed part on the baffle, and the axial abutment surfaces. This segmentation allows each element to perform its specific function while maintaining overall system simplicity
Solution Approach 2:
The potential harm of baffle detachment is converted into a benefit by designing the bayonet-type system where the same geometric features that enable easy assembly also provide secure retention, turning what could be a simple mounting into a protective mechanism
3Manufacturing precision
If the injection system is rigidly fixed to the baffle, then positioning is precise, but thermal expansion and differential movement cannot be accommodated
Solution Approach 1:
The bayonet-type mounting system provides a dynamic connection that allows for controlled movement and rotation, enabling the injection system to accommodate thermal expansion and differential movement while maintaining precise operational positioning through the angular locking mechanism
Solution Approach 2:
The system accommodates parameter changes such as thermal expansion by allowing angular adjustment and radial movement within the bayonet connection, while maintaining the critical positioning parameters through the abutment surfaces that define the operational angular position
Data Source
AI summary
A combustion chamber includes a bottom wall having at least one opening, at least one sleeve mounted upstream of the bottom wall and fixed to the bottom wall, a closing ring defining an annular groove with the sleeve and fixed to the sleeve, and at least one air and fuel injection system having an axis, mounted in the opening of the bottom wall. The injection system has an annular flange extending radially with respect to the axis and is mounted in the groove with radial clearance. A baffle is situated downstream of the bottom wall and is fixed to the sleeve and/or to the bottom wall.