Numerical Simulation on Water Mist Fire Suppression System Operation in Typical Environment

2013 ◽  
Vol 732-733 ◽  
pp. 491-494
Author(s):  
Peng Liu
Keyword(s):  
Computer Technology ◽  
Fire Suppression ◽  
Rapid Development ◽  
Water Mist ◽  
System Operation ◽  
Fire Dynamics ◽  
Computational Fluid Dynamics Cfd ◽  
The Cost ◽  
In Fire ◽  
Suppression System

Water mist fire suppression system is widely used in many places, for its little damage and greatly reduces the cost of extinguishing fire. But because of the intricate extinguishing mechanism of water mist, it is difficult to design an optimal water mist fire suppression system in a typical place. With the rapid development of computer technology, computational fluid dynamics (CFD) has already been proved to be a useful and powerful tool in fire safety science. Fire Dynamics Simulator (FDS) is used to simulated the interaction of water mist and fire in a typical fire scenario in this paper. Two design schemes of water mist system are compared to prove which one is better. Through simulated by FDS on these two cases, the water mist system with 4 sprinklers is suited in the restroom.

Fire Suppression by Water-Mist Sprays: Experimental and Numerical Analysis

2010 ◽  
Author(s):  
Paolo E. Santangelo ◽  
Paolo Tartarini ◽  
Beatrice Pulvirenti ◽  
Paolo Valdiserri ◽  
Andre´ W. Marshall
Keyword(s):  
Numerical Analysis ◽  
Fire Suppression ◽  
Test Chamber ◽  
Water Mist ◽  
Specific Reference ◽  
Test Case ◽  
Fire Dynamics ◽  
Suppression Mechanism ◽  
Thermal Transient ◽  
Combustion Tests

Water-mist systems have become a promising technology in the fire-fighting field over the last twenty years. The present work is aimed at employing the available knowledge on water-mist sprays in an experimental and numerical analysis of the suppression mechanism. Therefore, a water-mist system has been operated within a typical fire case. Most notably, this latter is constituted by a heptane pool fire: experiments have been carried out inside a test chamber, where a set of thermocouples has conveniently been placed to evaluate the thermal transient at different locations of interest. Some free-combustion tests have been run as a benchmark to validate combustion models. Then, a typical water-mist nozzle has been inserted and activated to realize control, suppression and potential extinction of the generated fire. The recognized FDS (Fire Dynamics Simulator) and Fluent® codes have been challenged in reproducing the test case: thermal transient and suppression time have been considered as parameters for validation. Therefore, the water-mist spray has been modeled and the already mentioned results about its characterization have been implemented as initial or boundary conditions. Moreover, the fire scenario has been modeled as well. A good agreement between experimental and numerical results has been obtained, even under some approximations, with specific reference to combustion mechanisms.

scholarly journals ANALYSIS OF HEAT RELEASE RATE IN ENGINE ROOM FIRES OF 300 GT FERRY RO-RO PASSENGER BY USING WATER MIST SYSTEM AND CO2 SYSTEM

2021 ◽  
Vol 15 (2) ◽  
Author(s):  
Wira Setiawan ◽  
Distyan Kotanjungan
Keyword(s):  
Heat Release ◽  
Heat Release Rate ◽  
Release Rate ◽  
Fire Suppression ◽  
Water Mist ◽  
Engine Room ◽  
Passenger Ships ◽  
Dynamic Simulator ◽  
Fire Dynamic Simulator ◽  
Suppression System

Based on statistical data in recent years, there are still quite a number of ship accidents due to fires, including on passenger ships. The water mist system is a fire suppression system that allows it to be used in the engine room with the advantage that it can keep the heat production rate low during the extinguishing process and can be operated earlier than the CO2 system. The research is conducted by using fire dynamic simulator in the engine room of a 300 GT ferry ro-ro passenger to compare the heat release rate of fire without an extinguishing system, an existing CO2 system, and a water mist system. The result shows that the CO2 fire suppression system reduces the heat release rate more rapidly to the decay phase at 375 seconds while the water mist takes more than 900 seconds. However, the fully developed phase of the water mist suppression system occurs more quickly than CO2 because the sprinklers are activated shortly after a fire occurs. Unlike water mist, the CO2 system is activated at 60 seconds so that the pre-combustion, growth, flashover, and fully developed phases are at the same HRR and time as the natural one.

Assessment of the Fire Dynamics Simulator for Modeling Fire Suppression in Engine Rooms of Ships with Low-Pressure Water Mist

2019 ◽  
Vol 56 (3) ◽  
pp. 1315-1352 ◽  
Author(s):  
Roberto Bellas ◽  
Miguel A. Gómez ◽  
Arturo González-Gil ◽  
Jacobo Porteiro ◽  
José L. Míguez
Keyword(s):  
Fire Suppression ◽  
Low Pressure ◽  
Water Mist ◽  
Fire Dynamics ◽  
Fire Dynamics Simulator ◽  
Pressure Water

scholarly journals CONCEPT DESIGN AND TESTING OF MULTI-NOZZLE WATER MIST FIRE SUPPRESSION SYSTEM

2011 ◽  
Vol 14 (2) ◽  
Author(s):  
Danardono A. Sumarsono ◽  
Yulianto S. Nugroho ◽  
Mariance , ◽  
I Gede Wahyu W. Ariasa
Keyword(s):  
Fire Suppression ◽  
Water Mist ◽  
Concept Design ◽  
Design And Testing ◽  
Suppression System

scholarly journals Analysis of Water Mist Fire Suppression System Applied on Cellulose Fire

2017 ◽  
Vol 170 ◽  
pp. 344-351 ◽  
Author(s):  
Fitri Pancawardani ◽  
Dwi Arini ◽  
Randy Putra Yunindar ◽  
Mohamad Lutfi Ramadhan ◽  
Fahri Ali Imran ◽  
...  
Keyword(s):  
Fire Suppression ◽  
Water Mist ◽  
Suppression System

New techniques and a new approach to the effective extinguishing of fully developed fires in enclosed spaces

2016 ◽  
Vol 8 (1) ◽  
pp. 213-224
Author(s):  
Norbert Tuśnio ◽  
Paweł Wolny
Keyword(s):  
Fire Suppression ◽  
Radiant Heat ◽  
Fire Service ◽  
Water Mist ◽  
Abrasive Waterjet ◽  
Water Spray ◽  
Fire Extinguishing ◽  
Pressure Water ◽  
Fire Area ◽  
In Fire

An example of modern water mist extinguishing technology is presented in the article. Water mist systems are firefighting systems which uses very fine water sprays. The smallest water droplets allow a water mist to control, suppress or extinguish fires by cooling both the flame and hot gases by evaporation, displacing oxygen by evaporation and reducing radiant heat through the small droplets themselves. The effectiveness of water mist systems in fire suppression depends on its spray characteristics, which include the droplet size and distribution, flux density and spray dynamics, phase of fire development, fire size and the ventilation conditions. The COBRA (known as PyroLance in USA) systems presented use of a cutting extinguisher is a fire extinguishing technique that combines abrasive waterjet cutting with water spray extinguishing, through a single handpiece or nozzle. The firefighter approaches the fire from outside the main fire area, then uses the cutting action to drill a small hole through a barrier such as a door, wall, roof or floor. Switching to a water spray then allows the fire to be fought, as with a conventional fog nozzle. An analysis of the benefits of using high-pressure water mist in conjunction with new firefighting tactics is described. State Fire Service should aim to minimize water consumption and thus reduce the post-fire losses, take care of environmental protection and improve safety conditions for firefighters.

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