Multipoint Injection Manifold for Reduced Airflow Blockage
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Solution Overview
Problem
Traditional multipoint fuel injection systems in gas turbine engines require complex manifolding that impedes air flow from the compressor to the combustor, necessitating a need for improved multipoint combustion systems.
Innovation Solution
A multipoint injection system with a simplified fuel injector and manifold construction, featuring oblique feed arms and internal manifolding to minimize air flow blockage, supported by bayonet flanges and additive manufacturing for reduced weight and improved manufacturability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional complex manifolding is used for multipoint fuel injection, then fuel distribution is achieved, but air flow from compressor to combustor is impeded
Solution Approach 1:
The manifold is segmented into multiple discrete feed arms rather than a continuous complex structure. Each feed arm is a separate component that can be independently positioned and configured, allowing fuel distribution to multiple injection points while maintaining open flow paths for air passage through the engine core.
Solution Approach 2:
The feed arms are positioned in a radial arrangement extending from the peripheral region toward the central axis of the engine, utilizing the radial dimension to distribute fuel. This dimensional arrangement allows air to flow axially from compressor to combustor without being blocked by the fuel distribution structure.
2Productivity
If a large number of injectors are used for multipoint injection, then combustion efficiency is improved, but system complexity and cost increase
Solution Approach 1:
The simplified manifold structure with radial feed arms serves multiple functions: it distributes fuel to multiple injection points, maintains structural integrity, and allows air flow passage. This universal design approach enables the system to support a large number of injectors without proportionally increasing complexity or cost.
Solution Approach 2:
The design changes the geometric parameters of the fuel distribution system by using straight radial feed arms instead of complex curved passages, and by positioning injectors at standardized intervals around the periphery. These parameter changes simplify manufacturing while maintaining the capability to support multiple injectors for improved combustion efficiency.
Data Source
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AI summary
A multipoint injection system includes a manifold (102) with a plurality of flow passages (104, 106, 108, 110) defined through the manifold in the circumferential direction. The flow passages are spaced apart from one another in an axial direction. A plurality of feed arms (116) extends radially inward from the manifold. Feed arm portions (118, 120, 122, 124) of the flow passages extend through each of the feed arms to respective outlets. The feed arm portions of the flow passages are within the axial width of the manifold. A plurality of injection nozzles (126) are included, each in fluid communication with a respective one of the outlets. Each injection nozzle includes an air passage therethrough with an air inlet. The feed arms each follow a path that is circumferentially offset from the air inlets so each of the feed arms is clear from a flow path directly upstream in the axial direction of each of the air inlets.