Monolithic Aircraft Propulsion Duct Structure
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Solution Overview
Problem
Existing aircraft propulsion duct structures are complex and heavy, with multiple sections that complicate installation and maintenance, and there is a need for a more efficient and streamlined design.
Innovation Solution
A monolithic duct structure for aircraft propulsion systems, comprising a transition duct, an inlet duct, and a bypass duct, where the ducts are configured as a single body with angularly offset outlets and curved sections, and a downstream bypass duct that can pivotally couple with the upstream bypass duct, reducing weight and complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If multiple sections are used in duct structures to facilitate installation and maintenance, then ease of operation is improved, but device complexity increases
Solution Approach 1:
The duct structure is divided into multiple sections (inlet duct section, transition duct section, bypass duct section) that can be separately manufactured and then assembled together, facilitating installation and maintenance while maintaining structural integrity
2Ease of repair
If multiple sections are used in duct structures, then ease of maintenance is improved, but weight increases
Solution Approach 1:
The duct is segmented into removable sections connected by coupling mechanisms, allowing maintenance personnel to access and service individual sections without removing the entire duct structure, thereby reducing maintenance complexity and weight
Solution Approach 2:
The coupling mechanisms and connection features are integrated within the duct sections themselves, with coupling members that nest into recesses in adjacent sections, eliminating the need for separate heavy fastening systems
3Device complexity
If a monolithic duct structure is used, then device complexity is reduced, but ease of installation deteriorates
Solution Approach 1:
The duct structure comprises multiple sections (inlet duct section, transition duct section, bypass duct section) that can be separately manufactured and assembled, improving ease of installation while maintaining structural integrity
Solution Approach 2:
The coupling mechanisms integrate multiple functions (structural connection, sealing, alignment) into unified assembly features, simplifying the installation process while maintaining the benefits of a integrated duct structure
4Productivity
If angularly offset outlets are implemented, then airflow management is improved, but manufacturing precision requirements increase
Solution Approach 1:
The transition duct section incorporates angularly offset outlets (first outlet at first angle, second outlet at second angle) that are asymmetrically positioned to optimize airflow distribution to different propulsion system components, improving overall system efficiency
Solution Approach 2:
The coupling mechanisms include integrated alignment features and positioning elements that pre-establish the correct angular orientation of outlets during assembly, reducing the precision requirements for subsequent manufacturing operations
Data Source
AI summary
An apparatus is provided for an aircraft propulsion system. This apparatus includes a duct structure, and the duct structure includes a transition duct, an inlet duct and a bypass duct. The duct structure is configured as a monolithic body. The transition duct includes an inlet, a first outlet and a second outlet. The transition duct extends longitudinally along a longitudinal centerline from the inlet to the second outlet. The first outlet is arranged longitudinally along the longitudinal centerline between the inlet and the second outlet. A centerline axis of the first outlet is angularly offset from the longitudinal centerline. The inlet duct extends longitudinally along the longitudinal centerline to the inlet. The bypass duct extends longitudinally along the longitudinal centerline from the second outlet.