Buoyant Gas Release for Realistic Fire Smoke Simulation
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Solution Overview
Problem
Current methods for testing smoke management systems, such as using smoke bombs or real fires, fail to accurately simulate the buoyancy forces present in real fires due to lack of realism and safety concerns.
Innovation Solution
A system that releases a naturally buoyant gas, such as helium, controlled by a bank of valves and measured by flow sensors, to mimic the velocity profile of a real fire source, allowing for precise simulation of smoke movement without significant energy release.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If smoke bombs or similar devices are used to test smoke management systems, then testing capability is provided, but realism of fire simulation is poor and significant energy release may cause damage
Solution Approach 1:
The patent creates a simplified copy of a real fire source by releasing buoyant gas (helium) that mimics the velocity profile and buoyancy forces of actual fire plumes. This copy reproduces the essential flow characteristics without the harmful thermal energy release, allowing realistic testing of smoke management systems while avoiding damage to the building interior
Solution Approach 2:
The patent replaces the thermal-mechanical system of real fire (combustion producing hot rising gases) with a purely mechanical buoyancy system. By using pressurized helium gas that expands and rises due to buoyancy forces, the system replicates fire plume dynamics without combustion, eliminating the harmful thermal energy release while maintaining realistic smoke movement patterns
2Ease of operation
If gases are mixed in a mixing chamber before release, then gas supply is controlled, but air flow simulation accuracy is reduced
Solution Approach 1:
The patent performs preliminary control of the buoyant gas supply through pressurization and valve regulation before release, but deliberately avoids pre-mixing with air. The gas is prepared in a controlled state (pressurized in storage tanks with control valves and flow sensors) and then released to naturally entrain ambient air, preserving the authentic velocity profile and buoyancy characteristics of real fire sources
Solution Approach 2:
The patent uses the natural physical process of air entrainment as an intermediary mechanism. Instead of pre-mixing gases in a chamber, the pressurized buoyant gas acts as an intermediary that naturally draws in and mixes with ambient air through turbulence and buoyancy-driven flow, accurately reproducing the air flow patterns that occur in real fire scenarios
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 approach enables accurate simulation of smoke movement and buoyancy forces, allowing for comprehensive testing of smoke management systems while ensuring safety and reducing damage, thereby meeting specific performance design criteria.
Implementation Method 1
release a gas or a mixture of gases with a density less than that of ambient air to simulate smoke movement from real fire sources
Implementation Method 2
the buoyant gas is not mixed in a mixing chamber. Instead, what is controlled is the release of pressurized buoyant gas from the release apparatus which then naturally mixes with the surrounding air outside the release apparatus through the physical phenomenon of entrainment
Data Source
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AI summary
A method and apparatus to simulate a flow of products from a real fire without reproducing a thermal environment associated with the real fire includes the release of a gas or a mixture of gases with an appropriate density less than air to simulate smoke movement from real fire sources. The buoyant inert gas may be helium. In some embodiments, the buoyant gas is combined with artificial smoke, such as a tracer gas or an inert dye (e.g., a particulate) to provide a visual representation of the location and flow characteristics of the surrogate smoke that is released from a release apparatus. In another embodiment, optical techniques that show differences in gas density are used to visualize the movement of the buoyant gas. The release apparatus includes a control system that follows a prescribed time-dependent flow rate to simulate different fire source configurations and growth rates.