Gas Turbine Combustion Chamber Axial Stop Design
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Solution Overview
Problem
Aeronautical gas turbine engine combustion modules experience significant deformations and operational degradation due to increased temperatures and pressures, leading to issues like injector movement and chamber ovality, which affect performance and safety, especially when existing manufacturing cycles and parts are not optimized for these conditions.
Innovation Solution
The introduction of first and second stop parts fixed to the outer housing and combustion chamber, respectively, which form pairs to achieve axial stops and allow for radial clearance, enabling precise positioning and stress management without modifying surrounding parts, thereby complementing existing fixing means like pins and absorbing thermal expansion differences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the combustion chamber operates at increased temperatures and pressures, then the engine power and efficiency are improved, but significant deformations and operational degradation occur
Solution Approach 1:
The patent introduces axial stops that constrain the combustion chamber's deformation under thermal and pressure loads. By changing the structural parameters (adding stop parts with axial constraints), the system can operate at higher temperatures and pressures without excessive deformation, thus improving power while maintaining reliability.
Solution Approach 2:
The axial stops are pre-installed between the outer housing and combustion chamber to prevent deformations before they occur during operation. This preliminary structural constraint ensures that when the engine operates at high power conditions, the combustion chamber maintains its shape and positioning, avoiding operational degradation.
2Productivity
If existing manufacturing cycles and parts are used, then manufacturing time and cost are reduced, but deformations and operational degradation occur due to lack of optimization for high temperature and pressure conditions
Solution Approach 1:
The solution segments the combustion module into distinct components with added axial stop parts. These stops are integrated into the existing manufacturing framework without requiring complete redesign of the combustion chamber or housing, thus maintaining manufacturing efficiency while improving positioning accuracy under operational conditions.
Solution Approach 2:
The axial stops act as intermediary elements between the outer housing and combustion chamber. They provide the necessary structural support and positioning accuracy without requiring modification of the primary components, allowing existing parts to be used while achieving the precision needed for high temperature and pressure operation.
3Manufacturing precision
If axial stops are introduced to limit deformations, then chamber positioning precision is improved, but device complexity increases
Solution Approach 1:
The axial stops serve multiple functions: they limit axial deformations, maintain chamber positioning, and absorb thermal expansion differences between the outer housing and combustion chamber. By making these simple components multi-functional, the patent achieves improved positioning precision without proportionally increasing structural complexity.
Solution Approach 2:
The axial stops are strategically positioned at specific locations where deformation control is most critical. Rather than adding complex constraints throughout the entire structure, the stops are placed locally to provide maximum benefit with minimal added complexity, maintaining chamber positioning accuracy while keeping the overall structure simple.
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 solution effectively limits axial deformations, maintains precise chamber positioning, and absorbs pressure-related forces, enhancing operational stability and performance while avoiding additional manufacturing time and part modifications.
Implementation Method 1
to allow, without undue stress, the clearance resulting from the difference in expansion between the outer housing and the combustion chamber
Data Source
AI summary
The invention concerns a turbo engine comprising a combustion chamber (110) arranged inside the outer housing (112) and comprising an internal revolution wall (118) and an external revolution wall (116). First stop parts (54) and second stop parts (56) fixed respectively to the outer housing and to the combustion chamber are provided, the first and second stop parts being adapted to come to a substantially axial stop two by two by forming stop pairs (58).