Hydrogen Bypass Line Shielding in Aircraft Propulsion Assemblies
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The existing propulsion systems in aircraft face the risk of hydrogen pipelines being severed by detached turbine or compressor blades during incidents, due to their structural positioning under the wing, which can lead to potential leaks and hazards.
Innovation Solution
A propulsion assembly with a bypass channel and protective absorption means, including a protective plate and absorption elements between the turbine and the bypass channel, to absorb the impact of detached blades and prevent pipeline damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the hydrogen pipeline runs outside the crankcase to simplify implementation, then the ease of manufacture is improved, but the reliability deteriorates due to risk of blade detachment cutting the pipeline
Solution Approach 1:
A protective plate is introduced as an intermediary element between the turbine blades and the hydrogen pipeline. This plate serves as a mediator that blocks detached blades from reaching and cutting the pipeline, thereby maintaining both the external routing of the pipeline for ease of manufacture and the safety/reliability by intercepting potential hazards before they reach the pipeline.
Solution Approach 2:
The protective plate acts as a pre-positioned protective barrier that is installed beforehand to cushion against the potential harm of blade detachment. By placing this protective element in advance, the system prepares for the worst-case scenario of blade failure, ensuring that even if blades detach, they cannot reach and damage the hydrogen pipeline.
2Reliability
If protective means are added between the turbine and bypass channel, then the reliability is improved, but the device complexity increases
Solution Approach 1:
Instead of protecting the entire turbine assembly or pipeline system, the protective plate is applied locally only at the critical area where the bypass channel passes near the turbine blades. This localized protection approach provides the necessary reliability at the specific vulnerability point while minimizing the addition of complex components throughout the entire system.
Solution Approach 2:
The protective plate is designed as a simple, inexpensive sacrificial component that can be easily replaced if damaged. Rather than using complex, expensive protective systems, a straightforward plate structure is employed that serves its protective function and can be substituted without significant cost or complexity, maintaining overall system simplicity while ensuring reliability.
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
The solution effectively prevents the bypass pipeline from being cut by detached blades, ensuring safety and integrity of the hydrogen supply system.
Implementation Method 1
an absorption means disposed between the protective plate and the associated bar
Data Source
Figure 1~2
Figure 3~4
Figure 5
AI summary
The invention relates to an aircraft propulsion assembly comprising a frame (180) in the form of a cage with bars (181), a turbine, a hydrogen supply line (170) winding inside a nacelle (149) to the rear of the turbine, with a radial step (204) to the outside of the nacelle (149), a ramp with a radial step to the outside of the nacelle (149), a bypass line (182) connected between the two radial steps (202) and to the outside of the nacelle (149), and protection means (300) comprising a protective plate (302), means for attaching (306) the protective plate (302) to the bars (181), and an absorption means (304) between the protective plate (302) and the associated bar (181). With such an arrangement, a turbine blade that detached would be stopped in its course by the protection and absorption means.