Hybrid Additive Thrust Chambers With Integral Fluid Manifolds
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Solution Overview
Problem
Current additive manufacturing techniques are inadequate for producing large-scale thermal combustion chambers with small features and multiple materials, as no single process can handle the combination of large overall size, small feature resolution, and varied material requirements necessary for rocket engine components like thrust chambers and fluid manifolds.
Innovation Solution
Hybrid additive manufacturing processes combine techniques like powder bed fusion, wire-arc additive manufacturing, and cold spray to form regeneratively-cooled liners, structural cladding, and fluid manifolds from different materials, allowing for the integration of complex geometries and materials within a single piece, such as Cu-based alloys for liners and Ni-Cr-based alloys for cladding and manifolds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single additive manufacturing process is used, then the manufacturing process is simple, but it cannot produce large-scale parts with small features and multiple materials
Solution Approach 1:
The manufacturing process is divided into multiple additive manufacturing techniques (powder bed fusion for high-resolution features, wire-arc additive manufacturing for large-scale structures, cold spray for surface coatings). Each process segment handles specific requirements, allowing the system to produce large-scale parts with small features and multiple materials while managing complexity through process specialization
Solution Approach 2:
The patent combines multiple materials (Cu-based alloys for thermal conductivity in liners, Ni-Cr-based alloys for structural strength in cladding and manifolds) within a single integrated component. This material composition strategy enables the part to meet diverse performance requirements across different regions without requiring separate components
2Reliability
If different materials are used for different regions, then the performance is optimized, but the manufacturing process becomes more complex
Solution Approach 1:
Different materials are strategically placed in different regions of the component: Cu-based alloys are used in the liner where high thermal conductivity is required for regenerative cooling, while Ni-Cr-based alloys are used in the cladding and manifolds where structural strength and pressure resistance are critical. This local material optimization achieves superior mechanical and thermal integrity
Solution Approach 2:
Multiple additive manufacturing processes are merged into a hybrid manufacturing system that can deposit different materials in a coordinated sequence. The process integrates powder bed fusion, wire-arc additive manufacturing, and cold spray techniques to build multi-material structures in a single manufacturing campaign, reducing the complexity that would arise from separate manufacturing and assembly operations
3Device complexity
If complex geometries are integrated into a single piece, then the manufacturing complexity is reduced, but the manufacturing precision required increases
Solution Approach 1:
The manufacturing process is segmented into different additive manufacturing techniques with specialized capabilities: powder bed fusion is used for regions requiring high precision and small features (cooling channels, intricate geometries), while wire-arc additive manufacturing handles larger, less precision-critical structures. This process segmentation allows complex geometries to be integrated into a single piece while maintaining the required manufacturing precision through appropriate process selection for each region
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 approach enables the creation of fully integrated thermal combustion chambers and fluid manifolds with high precision and strength, capable of withstanding extreme conditions, reducing manufacturing complexity and weight while maintaining mechanical and thermal integrity.
Implementation Method 1
a plurality of cooling channels formed between the inner and outer walls and in fluid communication with the at least one inlet and at least one outlet
Implementation Method 2
Additive manufacturing is a process by which a product or part is manufactured by adding one layer of material on top of another in a sequence or pattern that would result in a solid part being built
Data Source
AI summary
Additively manufactured thrust chambers and thrust chambers with integral fluid manifolds, and hybrid additive manufacturing methods for their production, are provided. Hybrid additive manufacturing techniques may combine a variety of processes including, WAAM, PBF, cold spray and DED, for example, to produce objects with variant dimensional requirements, i.e., large overall size and small features. Hybrid additive manufacturing may be defined as provide various process layers within any manufactured object. These process layers in turn allow for the introduction of variable feature and size distribution throughout the manufactured object. Hybrid process layers according to aspects may also allow the use of a variety of materials or may use a single material across the various process layers.