Symmetric Cascade Thrust Reversers for Engine Wing Interchangeability
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Solution Overview
Problem
Current thrust reverser systems for turbofan engines are designed asymmetrically, leading to unique cascade assemblies for each wing position, increasing manufacturing and maintenance complexity, and requiring multiple parts, which complicates interchangeability and raises costs.
Innovation Solution
The implementation of a symmetric thrust reverser system where each aircraft engine can use a common thrust reverser assembly, with cascades oriented symmetrically relative to a vertical plane, allowing the same assembly to be installed on either wing position without reconfiguration, reducing part counts and complexities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If asymmetric thrust reverser systems are used, then the exhaust flow is directed appropriately for each wing position, but the device complexity and part count increase
Solution Approach 1:
The patent applies asymmetry in reverse - it uses symmetric cascade assemblies that are mirror images of each other. The first and second cascade assemblies are configured to be substantially symmetric with respect to a longitudinal plane of the engine, allowing identical parts to be used on both wings while still achieving the required asymmetric exhaust flow directions for each wing position
2Productivity
If unique cascade assemblies are designed for each wing position, then the exhaust flow characteristics are optimized for each position, but the manufacturing and maintenance complexity increases
Solution Approach 1:
The symmetric cascade assembly design allows a single universal assembly type to be used on both left and right engine wings. The assemblies are substantially symmetric, meaning they can be installed on either wing position and will provide the appropriate exhaust flow characteristics for that position, eliminating the need for separate unique designs for each wing
3Reliability
If multiple unique parts are used, then the interchangeability between wings is reduced, but the part management and installation complexity increases
Solution Approach 1:
By designing the cascade assemblies to be substantially symmetric with respect to the engine's longitudinal plane, the patent enables identical parts to be used on both wings. This symmetry allows for easy interchangeability between wing positions while reducing part management complexity, as the same assembly design can be manufactured and stored for both left and right engines
Data Source
AI summary
Symmetric cascade thrust reversers and related methods are disclosed. An example apparatus includes a first cascade and a second cascade, the first cascade and the second cascade to be radially spaced relative to a longitudinal axis of a first aircraft engine extending in a fore-aft direction, the first cascade to provide a first flow characteristic and the second cascade to provide a second flow characteristic, the first flow characteristic provided by the first cascade symmetric relative to the second flow characteristic of the second cascade with respect to a vertical plane passing through the longitudinal axis of the aircraft engine.