Fluidic Oscillator Fire Extinguishing Jet Sweep
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Solution Overview
Problem
Fire extinguishing agents with higher boiling temperatures than Halon 1301 struggle to achieve sufficient vaporization rates in cold environments and high ventilation settings, such as in aircraft engines, due to their higher boiling points and the need for rapid fire suppression.
Innovation Solution
A fire extinguishing system utilizing a storage vessel and a fluidic oscillator to discharge a continuous jet of fire extinguishing agent, oscillating the jet back and forth through a sweep angle, which increases the agent's vaporization rate by breaking up droplets into smaller sizes and enhancing mixing with ambient air.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a fire extinguishing agent with a higher boiling temperature than Halon 1301 is used, then environmental harm is reduced, but the vaporization rate decreases in cold environments and high ventilation settings
Solution Approach 1:
The fire extinguishing agent jet is segmented into smaller droplets through the oscillating motion, increasing the total surface area and thereby enhancing the vaporization rate despite the higher boiling temperature of environmentally-friendly agents
Solution Approach 2:
The fluidic oscillator dynamically swings the jet back and forth through a sweep angle, creating time-varying motion that promotes rapid mixing with ambient air and accelerates vaporization of the fire extinguishing agent in cold, high-ventilation environments
2Object-affected harmful factors
If the fire extinguishing agent has a higher boiling temperature, then environmental friendliness is improved, but the rate of vaporization becomes insufficient in cold environments
Solution Approach 1:
The oscillating jet breaks the fire extinguishing agent into finer droplets, increasing surface area-to-volume ratio and enabling faster vaporization rates even for agents with higher boiling temperatures in cold environments
Solution Approach 2:
The periodic oscillation of the jet through the sweep angle creates repeated cycles of droplet formation and mixing, sustaining high vaporization rates throughout the discharge process in cold conditions
3Device complexity
If the fire extinguishing agent is discharged in a static manner, then the system is simple, but the vaporization rate is insufficient due to high engine ventilation rates
Solution Approach 1:
The fluidic oscillator introduces dynamic oscillating motion to the jet discharge without complex mechanical components, using fluid dynamics principles to achieve rapid vaporization that counters high engine ventilation rates
Solution Approach 2:
The system uses pneumatic principles through the fluidic oscillator to generate oscillating jet motion, leveraging fluid pressure and flow characteristics to enhance vaporization rate without mechanical moving parts
Data Source
AI summary
A fire extinguishing system includes a storage vessel and a fluidic oscillator. The storage vessel is configured to contain a fire extinguishing agent. The fluidic oscillator is configured to receive the fire extinguishing agent from the storage vessel, and discharge a continuous jet of the fire extinguishing agent while oscillating the jet back and forth through a sweep angle.