Ambient Air Propulsion for Firefighting UAVs
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Solution Overview
Problem
Operating vehicles in extreme heat environments, such as wildfires, poses challenges due to the need for flammable fuel sources and limited maneuverability in diverse wind patterns, which can lead to safety risks and inefficiencies in fire suppression and rescue operations.
Innovation Solution
A Fire Suppression System integrated into unmanned vehicles utilizing electric-driven propulsion with convergent-divergent nozzles that harness ambient air for thrust and lift, eliminating the need for combustible fuels and enabling greater control and safety in hostile fire environments by counteracting wind patterns and debris.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional combustion engines or battery arrays are used for propulsion, then the vehicle can operate extended periods, but the vehicle faces increased fire risk and resource consumption
Solution Approach 1:
The system uses ambient air as the working fluid, which is freely available in the environment. The compressors onboard the vehicle compress this ambient air to generate thrust, eliminating the need for external fuel sources while maintaining propulsion capability throughout extended operations.
Solution Approach 2:
By using compressed ambient air instead of combustible fuels or battery arrays, the system creates an inherently fire-safe propulsion mechanism. Compressed air is non-flammable and cannot ignite,彻底 eliminating the fire risk associated with traditional energy sources while providing sustained propulsion.
2Ease of operation
If single propulsion nozzle is used, then the device complexity is reduced, but the maneuverability and control in diverse wind patterns deteriorates
Solution Approach 1:
The propulsion system is divided into multiple independent nozzles positioned at different locations on the vehicle (front, rear, sides, top, bottom). Each nozzle can be independently controlled to generate thrust in specific directions, enabling precise maneuvering and stabilization against diverse wind patterns through differential thrust adjustment.
3Productivity
If vehicle operates in extreme heat environment, then fire suppression capability is improved, but the vehicle durability and safety deteriorates
Solution Approach 1:
The system compresses hot ambient air from the fire environment rather than rejecting it as a harmful condition. This hot compressed air becomes the working fluid for thrust generation, converting the extreme heat environment from a threat to a resource that enables both propulsion and fire suppression operations simultaneously.
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 system provides enhanced maneuverability and safety for vehicles and personnel by using compressed ambient air to generate thrust and lift, effectively navigating complex wind conditions and reducing the risk of ignition, while promoting zero emissions and resource conservation.
Implementation Method 1
A convergent divergent nozzle is used to accelerate a hot, pressurized gas passing through it to a higher speed in the axial (thrust) direction, by converting the heat energy of the flow into kinetic energy.
Implementation Method 2
The gas that flows through a de Laval nozzle is isentropic adiabatic, as heat loss here is either zero or near zero.
Implementation Method 3
using ambient air that is then compressed in situ for sourcing a propulsion nozzle subsystem to produce thrust and lift
Data Source
AI summary
A multimodal propulsion system of a remotely operated, semi-autonomous, autonomous operated aerial vehicle of a fire-resistant aerial vehicle for suppressing widespread fires deploying hybrid convergent-divergent nozzle systems, electric fans, compressed air subsystems, individually or in combination, primarily powered by ambient air from the fire environment, providing thrust, lift, thrust and lift.