Multi-Function Fixed Structure for Compact Cascade Thrust Reversers
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Solution Overview
Problem
Existing moving-grid thrust reversers in aircraft propulsion systems have a complex and voluminous architecture, which increases mass and cost, and lack a unified structure to integrate various functional components.
Innovation Solution
A fixed structure is introduced to connect the inverter to the turbomachine, incorporating a deflection edge and sharing multiple functions, such as guiding grids and deflecting reversing flow, thereby simplifying the architecture and reducing mass and cost.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If moving grid inverters are used to reduce nacelle length and mass, then the inverter mass and drag are reduced, but the architecture becomes relatively complex and voluminous due to separate fixed components on the turbomachine
Solution Approach 1:
The patent combines multiple previously separate fixed components (front frame, guide elements, deflection edges, and stop elements) into a single integrated fixed structure. This merging eliminates the need for separate components mounted on the turbomachine, simplifying the overall architecture while maintaining the mass-reduction benefits of moving grids.
Solution Approach 2:
The fixed structure is designed to perform multiple functions simultaneously: it provides structural support, guides grid movement, deflects reversing flow, and limits grid travel through integrated stop elements. This multi-functionality reduces the number of separate components needed, addressing the complexity issue while preserving mass savings.
2Reliability
If multiple separate fixed components are used for grid guidance and flow deflection, then specific functions are achieved, but the overall inverter volume and complexity increase
Solution Approach 1:
The guide elements and deflection edges are integrated into the fixed structure itself, eliminating separate components. The fixed structure's geometry provides both guidance surfaces and flow deflection surfaces, reducing overall inverter volume while maintaining reliable grid guidance and flow control functions.
Solution Approach 2:
The fixed structure serves multiple purposes: it guides grid movement through integrated guide elements, deflects reversing flow through built-in deflection edges, and provides structural support. This multi-functionality achieves reliable operation without increasing inverter volume.
3Ease of manufacture
If a simplified fixed structure is used to reduce inverter mass, then cost and mass are reduced, but the ability to perform multiple functions may be compromised
Solution Approach 1:
The fixed structure is designed with multi-functionality built-in: it provides structural support, guides grid movement through integrated guide elements, deflects reversing flow through built-in deflection edges, and limits grid travel through stop elements. This single structure performs all necessary functions, maintaining versatility while simplifying manufacture and reducing cost.
Solution Approach 2:
By combining multiple functions into a single fixed structure, the number of separate components to manufacture and assemble is reduced. This integration simplifies the manufacturing process and reduces cost while preserving all necessary inverter functions through the multi-functional design of the fixed structure.
Data Source
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AI summary
The invention relates to a movable-cascade thrust reverser comprising a multifunctional annular fixed structure (31) configured to be rigidly connected to a fan casing of a turbine engine or to an intermediate casing secured to the fan casing.