Aircraft Cargo Fire Suppression Pressure Control
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Solution Overview
Problem
Aircraft cargo compartment fire suppression systems face challenges with the phase-out of Halon 1301, requiring higher volumetric concentrations of alternative agents, which can lead to over-pressurization and damage due to excessive agent venting.
Innovation Solution
A fire suppression system with pressure sensors and a controller that manages the flow of fire suppression agents by regulating valves and a fan to maintain pressure differences and ratios within safe limits, preventing over-pressurization and waste.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If higher volumetric concentrations of alternative fire suppression agents are used to replace Halon 1301, then fire suppression effectiveness is improved, but over-pressurization of the cargo compartment occurs leading to damage and wasteful venting
Solution Approach 1:
The system employs pressure sensors that continuously monitor cargo compartment pressure and feed this information back to the controller. When pressure approaches predetermined threshold values, the controller automatically modulates the suppression agent discharge rate or duration to prevent over-pressurization, thereby maintaining both fire suppression effectiveness and pressure safety
Solution Approach 2:
The system dynamically adjusts the discharge characteristics of the fire suppression agent based on real-time pressure conditions. Rather than a fixed discharge profile, the system modifies flow rates and timing to adapt to changing pressure states, allowing effective suppression while avoiding excessive pressure buildup that would cause damage or venting
2Reliability
If higher volumetric concentrations of fire suppression agent are supplied to the cargo compartment, then fire suppression capability is improved, but agent wastage increases due to excessive venting
Solution Approach 1:
Pressure feedback from sensors to the controller enables real-time monitoring and adjustment of agent discharge. When pressure thresholds are approached, the system automatically reduces or terminates discharge, preventing both over-pressurization damage and wasteful venting of suppression agent outside the compartment
Solution Approach 2:
The system changes the discharge parameters (flow rate, duration, timing) of the fire suppression agent based on monitored pressure conditions. By dynamically adjusting these parameters, the system delivers sufficient agent for effective fire suppression while avoiding excessive discharge that would lead to wasteful venting
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
Enables the use of non-Halon agents in aircraft cargo compartments without risking damage or excessive agent wastage, ensuring effective fire suppression while maintaining compartment integrity.
Implementation Method 1
at least one first pressure sensor for sensing the pressure within the cargo compartment and at least one second pressure sensor for sensing the pressure in an area within the aircraft but external to the cargo compartment
Implementation Method 2
a fan for extracting fluid from the cargo compartment through the outlet valve
Data Source
Figure 1
AI summary
Afire suppression system (30) for an aircraft cargo compartment (12) comprises a source (32) of fire suppression agent, a supply line (42) for conducting the fire suppression agent to the compartment (12), at least one first pressure sensor (52) for sensing the pressure within the cargo compartment (12) and at least one second pressure sensor (54) for sensing the pressure in an area (14, 16) within the aircraft but external to the cargo compartment (12). The system (30) further comprises a first, inlet valve (18) permitting fluid communication between the area (14, 16) external to the cargo compartment (12) and the cargo compartment (12), a second, outlet valve (18) permitting fluid communication between the cargo compartment (12) and an or the area (14, 16) external to the cargo compartment (12) and a fan (22) for extracting fluid from the cargo compartment (12) through the outlet valve (12). A controller (38) is in communication with the first and second valves (18, 20) and the fan (22). The first and second pressure sensors (52, 54) are also in communication with said controller (38). The controller (38) is configured to close the first, inlet valve (18) and the second, outlet valve (20) upon initial operation of the system when a fire is detected and to operate the fan (22) when at least one of a difference in the pressures sensed by the at least one first and second pressure sensors (52, 54), a ratio of the pressures sensed by the first and second pressure sensors (52, 54) or a rate of change in a pressure measured by the first pressure sensor (52) exceeds a respective first predetermined value.