Additive Fluid Coupling Transitions to Reduce Coke Formation

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Solution Overview

Problem

Abrupt transitions between fluid conduits in turbine engines lead to flow disturbances and coke formation, necessitating improved connections and manufacturing methods for fluid couplings.

Innovation Solution

A method of connecting fluid conduits with non-rectangular joints and intermediate fluid conduits that can extend along straight, curved, or compound centerlines, allowing for gradual transitions and reduced stress, using additive manufacturing or discrete assembly with filler materials.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If conventional manufacturing methods are used to connect fluid conduits, then manufacturing simplicity is maintained, but abrupt transitions cause flow disturbances and coke formation

Engineering Contradiction:
Improveflow smoothnessVSAvoidmanufacturing complexity
Core Design Contradiction:
ReliabilityVSEase of manufacture

Solution Approach 1:

The patent applies curvature by replacing abrupt rectangular transitions with curved transition sections between fluid conduits. The curved geometry gradually changes the flow direction and cross-sectional area, eliminating sharp corners that cause flow separation and turbulence. This curvature principle directly addresses the flow disturbances and coke formation issues while maintaining manufacturing feasibility through standard machining or additive manufacturing processes.

Inventive Principle:
Principle #14Spheroidality (Curvature)

2Adaptability or versatility

If discrete conduits are connected together, then assembly flexibility is improved, but joint complexity and stress concentration increase

Engineering Contradiction:
Improveassembly flexibilityVSAvoidjoint complexity
Core Design Contradiction:
Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The patent merges multiple discrete conduit components into a single integrated fluid coupling body. The first and second fluid conduits are formed as integral parts of the same component, eliminating separate joints and connections. This merging approach reduces joint complexity, removes stress concentration points, while maintaining the flexibility to connect different conduit configurations through the integrated coupling structure.

Inventive Principle:
Principle #5Merging (Combining)

3Productivity

If abrupt transitions are used between conduits, then manufacturing simplicity is maintained, but flow disturbances and coke formation occur

Engineering Contradiction:
Improvemanufacturing efficiencyVSAvoidcoke formation
Core Design Contradiction:
ProductivityVSObject-generated harmful factors

Solution Approach 1:

The curved transition sections replace abrupt rectangular transitions, creating smooth gradual changes in flow path geometry. This curvature eliminates sharp corners where flow separation and turbulence occur, preventing the conditions necessary for coke formation. The manufacturing process remains efficient as the curved geometry can be produced through standard additive manufacturing or machining operations.

Inventive Principle:
Principle #14Spheroidality (Curvature)

4Strength

If rigid connections are used between conduits, then structural strength is improved, but stress and forces between conduits increase

Engineering Contradiction:
Improveconnection strengthVSAvoidstress concentration
Core Design Contradiction:
StrengthVSStress or pressure

Solution Approach 1:

The patent incorporates flexible features within the fluid coupling structure, such as compliant transition sections or flexible membrane elements, that allow relative movement between connected conduits. This flexibility absorbs thermal expansion, vibration, and misalignment stresses, reducing stress concentration while maintaining adequate connection strength. The flexible elements prevent stress buildup that would occur with completely rigid connections.

Inventive Principle:
Principle #30Flexible shells and thin films

Data Source

PatentEP2942510B1Methods for additive manufacturing of fluid couplings
Publication Date: 2022.06.29 RTX CORP
  • EP2942510B1 patent drawingFigure 1
  • EP2942510B1 patent drawingFigure 2
  • EP2942510B1 patent drawingFigure 3~4

AI summary

A method is provided involving an additive manufacturing system. This method includes a step of forming a first fluid conduit (38) using the additive manufacturing system. The method also includes a step of providing a fluid coupling (32, 33, 34). The fluid coupling (32, 33, 34) includes the first fluid conduit (38) and a second fluid conduit (40). The first fluid conduit (38) is connected to and fluidly coupled with the second fluid conduit (40). The first fluid conduit (38) has a first configuration. The second fluid conduit (40) has a second configuration that is different than the first configuration.