Hinged Panel Cargo Venting for Combustion Suppression
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Solution Overview
Problem
Existing aircraft cargo compartment fire suppression systems are inadequate in handling unexpected combustion events, particularly with hazardous materials like lithium ion batteries, as they often rely on containment methods that can exacerbate the situation rather than effectively mitigating the risk.
Innovation Solution
A system and method involving a hinged panel in the cargo compartment that automatically opens to vent combustion products to the ambient environment, utilizing a temperature-sensitive release device to expose the interior to airflow, thereby suppressing the combustion event rapidly and safely.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a hinged panel is retained in the closed position with a release device, then the cargo compartment is sealed to contain combustion events, but the containment method can exacerbate the situation rather than effectively mitigating the risk
Solution Approach 1:
Instead of containing the combustion event within the sealed cargo compartment, the system inverts the approach by automatically opening the hinged panel to vent combustion products outward. The release device is designed to fail open under heat exposure, allowing the harmful combustion gases to escape rather than be trapped, thereby converting the harmful containment effect into a beneficial venting mechanism.
Solution Approach 2:
The system converts the harmful thermal energy and combustion products into a beneficial signaling mechanism. The heat from the combustion event, which would normally exacerbate the fire, instead triggers the release device to open the panel, transforming the harmful thermal effect into a useful automatic safety response that vents the combustion products and suppresses the fire.
2Speed
If a temperature-sensitive release device is used to automatically open the hinged panel, then the system responds rapidly to combustion events, but the system complexity increases
Solution Approach 1:
The release device is designed as a self-activating component that automatically responds to thermal conditions without requiring external control systems, sensors, or power sources. The temperature-sensitive material within the release device directly reacts to heat exposure and triggers the panel opening mechanism, allowing the system to serve itself and achieve rapid response while minimizing added complexity.
Solution Approach 2:
The system replaces complex electronic or mechanical control systems with a passive temperature-sensitive mechanical release device. Instead of using sensors, controllers, and actuators to detect and respond to combustion events, the invention uses a straightforward thermal-mechanical mechanism where heat directly causes the release device to fail open, simplifying the overall system while maintaining rapid response.
3Productivity
If the hinged panel is opened to vent combustion products to the ambient environment, then the combustion event is suppressed rapidly, but the opening must be reliably sealed during normal operation
Solution Approach 1:
The hinged panel system transitions from a static closed state during normal operation to a dynamic open state during combustion events. The panel is designed to be held firmly closed by the release device under normal conditions, ensuring reliable sealing, but can rapidly transition to an open position when the release device responds to thermal conditions, allowing the system to adapt dynamically to changing operational requirements.
Solution Approach 2:
The release device is pre-configured with temperature-sensitive materials that are prepared to respond immediately upon exposure to combustion heat. The hinged panel mechanism is pre-positioned and ready to open, with the release device already containing the thermal response capability, so that when combustion occurs, the venting action can begin immediately without requiring additional activation steps or delays.
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
This approach effectively suppresses unexpected combustion events by rapidly venting products to the ambient environment, reducing the risk of fire spread and enhancing safety without human intervention, thus improving the effectiveness of fire suppression systems onboard aircraft.
Implementation Method 1
a release device configured to retain the hinged panel in the closed position and configured to release the hinged panel for movement into the open position when an unexpected combustion event forms in the interior
Implementation Method 2
allows airflow from the ambient environment to enter the interior for suppressing the unexpected combustion event
Data Source
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AI summary
An aircraft that includes an outer skin 114 having an opening 118 formed therein, and a cargo compartment 108 including a plurality of side walls 120 that define an interior of the cargo compartment. The plurality of side walls 120 are positioned such that the interior 122 is in flow communication with the opening. The aircraft further includes a hinged panel 128 coupled to the outer skin 114. The hinged panel 128 is operable between a closed position for covering the opening 118 and an open position for exposing the interior to an ambient environment outside the aircraft. A release device 130 is configured to retain the hinged panel in the closed position, and configured to release the hinged panel for movement into the open position when an unexpected combustion event forms in the interior.