Numerical modeling and experimental measurements of a high speed solid-cone water spray for use in fire suppression applications

2004 ◽  
Vol 30 (11) ◽  
pp. 1369-1388 ◽  
Author(s):  
S.S. Yoon ◽  
J.C. Hewson ◽  
P.E. DesJardin ◽  
D.J. Glaze ◽  
A.R. Black ◽  
...  
Keyword(s):  
Numerical Modeling ◽  
High Speed ◽  
Fire Suppression ◽  
Experimental Measurements ◽  
Water Spray ◽  
Solid Cone ◽  
In Fire

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.

Numerical modeling and experimental measurements of water spray impact and transport over a cylinder

2006 ◽  
Vol 32 (1) ◽  
pp. 132-157 ◽  
Author(s):  
S.S. Yoon ◽  
P.E. DesJardin ◽  
C. Presser ◽  
J.C. Hewson ◽  
C.T. Avedisian
Keyword(s):  
Numerical Modeling ◽  
Experimental Measurements ◽  
Water Spray

Numerical modeling of wet steam infused fluid mixture for potential fire suppression applications

2021 ◽  
Author(s):  
Hengrui Liu ◽  
Ivan Miguel De Cachinho Cordeiro ◽  
Anthony Chun Yin Yuen ◽  
Cheng Wang ◽  
Ao Li ◽  
...  
Keyword(s):  
Numerical Modeling ◽  
Fire Suppression ◽  
Wet Steam ◽  
Fluid Mixture

scholarly journals Broadband Power Line Communication for Integration of Energy Sensors within a Smart City Ecosystem

Sensors ◽  
2021 ◽  
Vol 21 (10) ◽  
pp. 3402
Author(s):  
Jan Slacik ◽  
Petr Mlynek ◽  
Martin Rusz ◽  
Petr Musil ◽  
Lukas Benesl ◽  
...  
Keyword(s):  
Smart Grids ◽  
High Speed ◽  
Power Line ◽  
Experimental Simulation ◽  
Power Line Communication ◽  
Experimental Measurements ◽  
Simulation Tool ◽  
Smart Metering ◽  
Complex Simulation ◽  
Simulation Results

The popularity of the Power Line Communication (PLC) system has decreased due to significant deficiencies in the technology itself, even though new wire installation is not required. In particular, regarding the request for high-speed throughput to fulfill smart-grid requirements, Broadband Power Line (BPLC) can be considered. This paper approaches PLC technology as an object of simulation experimentation in the Broadband Power Line Communication (BPLC) area. Several experimental measurements in a real environment are also given. This paper demonstrates these experimental simulation results as potential mechanisms for creating a complex simulation tool for various PLC technologies focusing on communication with end devices such as sensors and meters. The aim is to demonstrate the potential and limits of BPLC technology for implementation in Smart Grids or Smart Metering applications.

scholarly journals Drone Swarms in Fire Suppression Activities: A Conceptual Framework

Drones ◽  
2021 ◽  
Vol 5 (1) ◽  
pp. 17
Author(s):  
Elena Ausonio ◽  
Patrizia Bagnerini ◽  
Marco Ghio
Keyword(s):  
Technological Development ◽  
Fire Suppression ◽  
Water Flow Rate ◽  
Cellular Automata Model ◽  
Fire Propagation ◽  
Active Fire ◽  
Fire Front ◽  
Main Factors ◽  
Mediterranean Scrub ◽  
In Fire

The recent huge technological development of unmanned aerial Vehicles (UAVs) can provide breakthrough means of fighting wildland fires. We propose an innovative forest firefighting system based on the use of a swarm of hundreds of UAVs able to generate a continuous flow of extinguishing liquid on the fire front, simulating the effect of rain. Automatic battery replacement and extinguishing liquid refill ensure the continuity of the action. We illustrate the validity of the approach in Mediterranean scrub first computing the critical water flow rate according to the main factors involved in the evolution of a fire, then estimating the number of linear meters of active fire front that can be extinguished depending on the number of drones available and the amount of extinguishing fluid carried. A fire propagation cellular automata model is also employed to study the evolution of the fire. Simulation results suggest that the proposed system can provide the flow of water required to fight low-intensity and limited extent fires or to support current forest firefighting techniques.

scholarly journals Extreme Wildfire occurrence in response to Global Change type Droughts in the Northern Mediterranean

2017 ◽  
Author(s):  
Julien Ruffault ◽  
Thomas Curt ◽  
Nicolas K. Martin St-Paul ◽  
Vincent Moron ◽  
Ricardo M. Trigo
Keyword(s):  
Climate Change ◽  
Global Warming ◽  
Fire Suppression ◽  
Climate Change Scenarios ◽  
Fire Weather ◽  
Specific Interactions ◽  
Wildfire Occurrence ◽  
Drought Conditions ◽  
In Fire ◽  
Mediterranean France

Abstract. Increasing drought conditions under global warming are expected to alter the frequency and distribution of large, high intensity wildfires. Yet, little is known regarding how it will affect fire weather and translate into wildfire behaviour. Here, we analysed the climatology of extreme wildfires that occurred during the exceptionally dry summers of 2003 and 2016 in Mediterranean France. We identified two distinct shifts in fire climatology towards fire weather spaces that had not been explored before, and which result from specific interactions between the types of drought and the types of fire. In 2016, a long-lasting press drought intensified wind-driven fires. In 2003, a hot drought combining a heatwave with a press drought intensified heat-driven fires. Our findings highlight that increasing drought conditions projected by climate change scenarios might affect the dryness of fuel compartments and create several new generations of wildfire overwhelming fire suppression capacities.

Induced Flow Reciprocating Pump Theory Supported by New Performance Data

1972 ◽  
Vol 94 (4) ◽  
pp. 706-714 ◽  
Author(s):  
J. D. Burton ◽  
J. Lobo-Guerrero U.
Keyword(s):  
High Speed ◽  
Performance Data ◽  
Experimental Measurements ◽  
Long Time ◽  
Induced Flow ◽  
Hydraulic Accumulator ◽  
Reciprocating Pump

Reciprocating pumps have been employed in conjunction with air vessels and fluid accumulators for a long time in order to reduce maximum cylinder pressures and energy wastage in friction. More recently, diaphragm pumps, run at high speed, have been built utilizing a hydraulic accumulator or capacitance in conjunction with a hydraulic inductance, in order to greatly increase the flow output. Volumetric efficiencies of over 250 percent have been obtained. The present paper describes briefly this induced flow principle and then compares theoretical solutions with experimental measurements taken in the first commercially available pump of this type.

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