Deployable Conduit Valve for Aircraft Bleed Air Breach Containment
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Solution Overview
Problem
Aircraft environmental control system conduits often leak pressurized air when breaches occur, leading to undesired discharge and potential damage due to increased pressure and temperature in the vicinity of the breach, particularly if the breach happens inside a nacelle or pylon.
Innovation Solution
A deployable valve with at least one arm that can laterally restrict flow within the conduit cross-sectional area, activated by pressure differentials or motorized mechanisms, to limit gas discharge and prevent pressure increases upon conduit breaches.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the conduit is made flexible to accommodate thermal growth, then adaptability is improved, but reliability deteriorates due to increased leakage risk at flexible-rigid connections
Solution Approach 1:
The valve is segmented into multiple deployable arms that can independently obstruct the conduit. This segmentation allows the valve to effectively seal the breach regardless of its location along the conduit, addressing the reliability issue caused by flexible-rigid connection leaks while preserving the flexible design for thermal accommodation.
Solution Approach 2:
The valve arms are positioned in a retracted state during normal operation, allowing the flexible conduit to accommodate thermal growth without restriction. Upon detecting a breach, the arms are deployed to obstruct the conduit, preliminarily preventing the harmful effects of leakage before they can cause damage.
2Reliability
If a valve is deployed to restrict flow and prevent damage, then reliability is improved, but device complexity increases
Solution Approach 1:
The valve system is designed to be self-activating through pressure differentials detected by sensors. When a breach occurs, the pressure differential automatically triggers the deployment of valve arms without requiring complex external control systems, thereby improving reliability while minimizing the addition of complex control mechanisms.
Solution Approach 2:
The valve transitions from a static retracted state to a dynamic deployed state upon breach detection. This dynamic capability allows the valve to remain simple during normal operation while providing complex protection functionality only when needed, balancing reliability improvement with minimal complexity increase.
3Productivity
If the valve arms are deployed laterally into the conduit cross-sectional area, then flow restriction is improved, but the risk of arm failure increases due to higher structural demands
Solution Approach 1:
The valve arms are designed with varying cross-sectional properties along their length, with thicker sections at the pivot point and root where stresses are highest, and thinner sections toward the distal end. This local quality optimization provides sufficient structural integrity for flow restriction while minimizing overall arm mass and complexity.
Solution Approach 2:
The arms are designed and pre-positioned to engage the conduit walls at optimized locations that distribute lateral forces. This preliminary structural arrangement ensures that when deployed, the arms can effectively restrict flow while maintaining structural integrity under the lateral loads imposed by pressurized gas.
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 valve effectively reduces the volume of gas discharged during a breach, minimizing pressure and temperature increases, thereby reducing the risk of damage to aircraft components and maintaining system integrity.
Implementation Method 1
contingent upon receiving an indication of a pressure reduction at a sensing point along the conduit, deploying an arm into the cross-sectional area of the conduit
Data Source
AI summary
A compressed air conduit can have a cross-sectional area, and a valve, the valve having at least one arm being deployable laterally into the cross-sectional area of the conduit to restrict flow within the conduit.