Aircraft Propulsion Ventilation Regulator for Fire Safety
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional aircraft propulsion units face challenges in managing ventilation air flow, which affects fire-extinguishing agent volume and oxygen supply, leading to increased weight and cost in fire suppression systems and equipment cooling.
Innovation Solution
An aircraft propulsion unit with an air flow adjustment regulator that reduces ventilation air flow when a fire is detected, using mechanisms like flow-control valves or fusible link valves to decrease air inlet and outlet passage sections, thereby limiting oxygen supply and fire power.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the scoop size is increased to provide adequate ventilation and cooling air to equipment in the fan compartment under nominal operating conditions, then the cooling performance is improved, but the air intake and oxygen intake increase in the event of a fire
Solution Approach 1:
The patent applies a flow adjustment regulator that dynamically changes the passage section of the scoop based on operating conditions. Under nominal conditions, the regulator maintains a larger passage section to provide adequate cooling air. When fire is detected, the regulator reduces the passage section to limit oxygen supply. This dynamic adjustment resolves the contradiction between cooling performance and fire safety.
Solution Approach 2:
The patent changes the physical parameter of the scoop passage section from fixed to variable. By using a flow adjustment regulator with movable elements (such as adjustable vanes or movable walls), the passage section area is changed according to operational needs, allowing optimization of both cooling efficiency and fire suppression requirements.
2Duration of action of stationary object
If the ventilation air flow is increased to cool equipment in the fan compartment, then the equipment lifespan is extended, but the weight and volume of fire-extinguishing agent required increases
Solution Approach 1:
The flow adjustment regulator dynamically controls ventilation air flow based on operational status. During normal operation, adequate air flow is maintained for equipment cooling. During fire conditions, the regulator reduces air flow to minimize oxygen supply, thereby reducing the required fire-extinguishing agent quantity and weight, while still protecting equipment lifespan through controlled cooling periods.
Solution Approach 2:
The patent changes the ventilation air flow parameter from constant to variable by implementing a flow adjustment mechanism. This allows optimization of equipment cooling during normal operation while minimizing oxygen supply during fire events, reducing fire-extinguishing agent requirements and overall system weight.
3Device complexity
If a fixed passage section scoop is used for ventilation, then the device complexity is reduced, but the ability to adapt to different operating conditions (fire vs. normal operation) is limited
Solution Approach 1:
The patent introduces a flow adjustment regulator with movable components that allow the scoop passage section to be dynamically adjusted. This adds controlled complexity to enable adaptation between normal operation (adequate cooling) and fire conditions (limited oxygen supply), resolving the trade-off between simplicity and adaptability.
Solution Approach 2:
The flow adjustment regulator serves multiple functions: it controls ventilation for equipment cooling during normal operation and limits oxygen supply during fire events. This multi-functionality allows a single device to address both cooling requirements and fire safety requirements, improving versatility without proportionally increasing complexity.
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 solution reduces the weight and cost of fire-extinguishing systems, extends equipment lifespan by optimizing cooling, and allows for the use of lighter, less expensive materials by limiting ventilation air flow during fires, improving safety and efficiency.
Implementation Method 1
air flow adjustment regulator, configured to maintain a nominal value of the ventilation air flow circulating through at least one of said air inlet and of said air outlet under nominal operating conditions, and to reduce the value of this ventilation air flow when a fire is detected inside said compartment
Implementation Method 2
using mechanisms like flow-control valves or fusible link valves to decrease air inlet and outlet passage sections
Data Source
AI summary
An aircraft propulsion unit is described. The unit may include a gas generator with a fan surrounded by a casing. A nacelle may extend around the casing and define an annular compartment with the casing wherein some equipment may be housed. An air inlet may be configured so a ventilation air flow penetrates inside the compartment. An air outlet may be configured so a ventilation air flow is evacuated from the compartment. The propulsion unit may also include an air flow adjustment regulator. The air flow adjustment regulator may be configured to maintain a nominal value of the ventilation air flow circulating through at least one of the air inlet and of the air outlet under nominal operating conditions, and to reduce the value of this ventilation air flow when a fire is detected inside the compartment.