Turbomachine Injector Nesting Design Eliminates Weld Distortion
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Solution Overview
Problem
The existing injector devices for turbomachines face challenges in manufacturing due to difficult and non-reproducible welds, which distort slits and harm air flow, leading to high costs and reduced sturdiness.
Innovation Solution
The injector device configuration eliminates welding between cellular parts by using a nesting design with coaxial mounting of annular parts, a retainer ring, and a centring guide, with welding occurring in a single radial plane to immobilize the internal part rotation and ensure alignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If welding is used to join cellular parts in the injector device, then the parts can be assembled together, but the welds distort the slits and harm air flow while increasing manufacturing cost and reducing sturdiness
Solution Approach 1:
The swirl chamber is divided into multiple cellular parts (first cellular part and second cellular part) that are separate from each other. These parts are joined to the retainer ring independently rather than being welded together, which eliminates the distortion problem while maintaining structural integrity. The segmentation allows each part to be manufactured and assembled separately with precise slit geometry.
Solution Approach 2:
The retainer ring serves as an intermediary component that joins the cellular parts without requiring direct welding between the parts themselves. The retainer ring provides a stable mounting structure that holds the cellular parts in place, eliminating the need for welds that would distort the slits while still achieving the necessary assembly.
2Reliability
If multiple welds are used to join cellular parts and retainer ring, then the structure can be assembled, but the welding process becomes complex and non-reproducible
Solution Approach 1:
The structure is segmented into distinct components (cellular parts and retainer ring) that can be joined through simple mechanical attachment rather than complex welding processes. This segmentation reduces the number of welding operations required and makes the assembly process more reproducible while maintaining structural integrity through the retainer ring's mounting function.
3Ease of manufacture
If welding is used to join cellular parts, then assembly is achieved, but the process becomes costly and time-consuming
Solution Approach 1:
The retainer ring acts as an intermediary that enables assembly without requiring expensive and time-consuming welding operations. The cellular parts can be mechanically attached to the retainer ring, which provides a stable structure while eliminating the need for costly welding processes and reducing manufacturing time.
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 design results in a more cost-effective, easier-to-manufacture, and sturdier injector device that maintains air flow integrity by eliminating slit distortion and ensuring precise alignment of air and fuel mixing conduits.
Implementation Method 1
the internal part being adapted to be self-centred in the external part by contacting axial and radial walls
Implementation Method 2
the retainer ring, the external part and the internal part are welded together in a same radial plan along opposite radial faces
Implementation Method 3
The air swirls in opposed direction form in the Venturi tubes overlapping air patches and in which fuel particles are going to homogenously mix
Data Source
AI summary
A low-cost combustion chamber injector device that has sturdier construction and is safer for use. Parts are configured specifically to be nested, to dispense with welding between the cellular parts. The device for injecting a fuel-air mix includes, centered on a single axis, a swirl chamber including at least two annular air suction parts, a centering guide, and a retainer ring. The annular parts have cellular conduits connecting to axial inner and outer Venturi tubes. The parts are coaxially mounted, the inner part being configured to be self-centered in the outer part by engagement of the axial and radial walls and then, after assembly, the outer part is welded to the retainer ring and to the inner part in a single radial plane.