Aircraft Propulsion Ventilation and Fire Suppression Integration
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Solution Overview
Problem
Existing aircraft propulsion systems face inefficiencies in ventilation, with excessive fresh air supply during cruising and insufficient supply during taxiing, leading to over-ventilation and increased fuel consumption, and require a more compact fire-fighting system to replace Halon with new extinguishing fluids needing larger storage volumes.
Innovation Solution
A propulsion assembly with a suction system, drive means, transfer pipe, distribution pipe, and a fire-fighting system featuring a control system that regulates air flow and extinguishing fluid distribution, allowing for forced ventilation and concentrated extinguishing product supply, reducing the need for large storage volumes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If passive ventilation with fixed orifices is used, then ventilation is ensured during all phases, but excessive fresh air supply during cruising leads to over-ventilation and increased fuel consumption
Solution Approach 1:
The patent applies dynamics by replacing fixed ventilation orifices with a mobile door that can change its position and opening area dynamically. The mobile door is actuated by a drive mechanism (motor or pneumatic actuator) to adjust the ventilation opening according to flight phase requirements, enabling the system to adapt ventilation rates to actual thermal needs and avoid excessive fuel consumption during cruising while ensuring adequate ventilation during taxiing.
2Object-affected harmful factors
If new extinguishing fluids are used to replace Halon, then environmental requirements are met, but larger storage volumes are required
Solution Approach 1:
The patent merges the fire-fighting system with the ventilation system by using the same mobile door and drive mechanism for both ventilation control and fire-fighting fluid distribution. The mobile door acts as a controlled access point that can direct extinguishing fluids into the compartment while maintaining environmental compliance with alternative extinguishing agents, thereby eliminating the need for separate dedicated fire-fighting openings and reducing overall storage volume requirements.
3Productivity
If a mobile door with drive mechanism is used for ventilation control, then ventilation is optimized according to flight phase, but device complexity increases
Solution Approach 1:
The patent applies universality by designing the mobile door and its drive mechanism to serve multiple functions: controlling ventilation during normal operation and distributing fire-fighting extinguishing fluids during emergency conditions. This multi-functional approach eliminates the need for separate dedicated mechanisms for each function, thereby reducing overall system complexity while achieving ventilation optimization according to flight phase requirements.
4Reliability
If ventilation orifices are sized for taxiing phase, then adequate ventilation is provided during taxiing, but over-ventilation occurs during flight
Solution Approach 1:
The patent resolves this contradiction by implementing a mobile door with adjustable opening area that can dynamically adapt to different flight phases. During taxiing, the door opens to provide adequate ventilation; during cruising, the door closes partially or completely to reduce ventilation to appropriate levels. This dynamic adjustment prevents energy loss from over-ventilation while ensuring reliability of ventilation when needed.
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 provides optimized ventilation according to flight phase needs, reducing fuel consumption and enabling effective fire suppression with a more compact fire-fighting system, using a smaller quantity of extinguishing fluid while maintaining equivalent effectiveness.
Implementation Method 1
a suction system having an inlet, an outlet and mobile elements that are designed to draw air in via the inlet and deliver the drawn-in air via the outlet
Implementation Method 2
a regulating means arranged so as to regulate the flow rate of air in the suction system
Implementation Method 3
a fire-fighting system having a reservoir containing an extinguishing fluid, a discharge pipe of which a first end is fluidically connected to the reservoir
Data Source
AI summary
A propulsion assembly with an outer compartment, an inner compartment, a supply pipe and a transfer pipe between the two compartments, a suction system between the two pipes, a regulating element that regulates the flow rate of air in the suction system and a fire-fighting system having a reservoir of extinguishing fluid, a discharge pipe connected to the reservoir, and a control system between the reservoir and the discharge pipe. The discharge pipe is configured and arranged to supply the transfer pipe when the control system is in the open position. The outside air is then driven by the suction system and passes through the two compartments in a forced manner and the extinguishing fluid reaches the transfer pipe to flow into the inner compartment.