Physical Characteristics of Fire-Extinguishing Powders.

Finnerty, Anthony E.; Kieft, Lawrence J. Vande; Drysdale, Andrew T.

doi:10.21236/ada328805

Cited by 4 publications

(3 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The fire in an engine bay is usually of a turbulent diffusion flame stabilized behind an obstacle. 35 Ideally, airflow through the ventilation should be unidirectional to prevent flame propagation in the event of a fire outbreak. However, due to the design of the engine nacelle, turbulence is inevitable, and its presence precludes homogeneity, which can lead to failure in the suppression of a fire.…”

Section: Resultsmentioning

confidence: 99%

Modelling of fire-suppressant injection into engine nacelle for various flight regimes

Mohamed

New

2023

Proceedings of the Institution of Mechanical Engineers, Part G:

View full text Add to dashboard Cite

In this study, the injection of Halon 1301, an effective fire-suppressing agent, into a helicopter engine nacelle is modelled to provide insights into dispersion behaviour alongside complex flow physics. The injection velocity as well as the mass flow rate were retrieved via a 1-D pipe model to simulate nitrogen-pressurized flow of Halon 1301 in a four-branch pipe system. The Discrete Phase Model in ANSYS Fluent was then used to model the injection of Halon 1301 into an engine nacelle. To simulate engine operation conditions in forward flight and hover regime, external boundary conditions were prescribed to the pressure inlets in the nacelle. When Halon 1301 is injected into the engine bay via the first pair of injection points, the droplets immediately reach their boiling point of 215 K. This resulted in an explosive-dispersion behaviour with a cone angle in the range of 80°–90°. As the agent evaporates, the engine cools and another pair of injection points located at the rear of the engine is subsequently activated, helping to cool the engine further. The two flight regimes considered, namely, hover and forward flight, showed contrast in flow dynamics which affected the cooling of the engine as well as the spray dynamics. In particular, the forward flight case showed more recirculation zones compared to the hover case. The volume concentrations of Halon 1301 were plotted for 11 probe points within the nacelle, and it was observed that two locations showed traces of low concentration levels.

show abstract

Section: Resultsmentioning

confidence: 99%

Modelling of fire-suppressant injection into engine nacelle for various flight regimes

Mohamed

New

2023

Proceedings of the Institution of Mechanical Engineers, Part G:

View full text Add to dashboard Cite

show abstract

“…Additives, such as aqueous film-forming foam (AFFF), showed improved effectiveness for hydrocarbon pool fires [48]. Additives can be used to avoid the freezing of storage water in colder climates and have been found to improve the effectiveness of systems [68][69][70]. Adding nitrogen and other inert gases to the water mist can increase firefighting capabilities, leading to the development of twin-fluid systems [71,72].…”

Section: Effect Of Different Water Mist Additivesmentioning

confidence: 99%

Water Mist Fire Suppression Systems for Building and Industrial Applications: Issues and Challenges

Farrell

Hassan

Hossain

et al. 2023

Fire

View full text Add to dashboard Cite

Interest in water mist fire suppression has increased within the fire protection industry due to its ability to control the spread and development of fire without using environmentally damaging agents. Water mist fire suppression has been used for many years in various applications such as machinery spaces, combustion turbine enclosures, and onboard passenger sea vessels. Now there is a demand to use this firefighting method to protect other fire risks such as cooking areas, commercial buildings, residential buildings, electrical equipment, road tunnels, bushfire (wildland fire) protection, and nuclear power generation facilities. To support this industry demand, this review covers the fundamentals of water mist, its suppression mechanisms, areas of application, existing research and development, and the codes and standards related to design. This comprehensive review provides a clear history of water mist suppression. It is able to identify the issues and challenges related to the technology to help pave the way for future research and development that will improve these systems to a level so that they are suitable for these new applications and meet the industry demand for nontoxic fire suppression systems.

show abstract

“…At the further heating above 800 °C Na 2 CO 3 gradually decomposes into sodium oxide and carbon dioxide. Due to the property of releasing CO 2 gas upon heating and decomposition, sodium bicarbonate is widely used in fire extinguishers as a fire-suppression agent [21,22] and can be used as well as flame retardant additive to polymers and paints [23][24][25]. Therefore, it is of interest to study sodium bicarbonate as epoxy polymer filler.…”

Section: Introductionmentioning

confidence: 99%

Epoxy Composites Filled with Sodium Bicarbonate: Thermal and Mechanical Properties

Murashkina

Lipchansky

2018

KEM

View full text Add to dashboard Cite

The epoxy composites filled with 5 and 10 mass % of sodium bicarbonate were prepared. Sodium bicarbonate at the heating decomposes into sodium carbonate, carbon dioxide and water. As a result, sodium bicarbonate is able to slow down the combustion process when it used as polymer filler. The thermal stability of the prepared samples was investigated at the heating in air using thermal analysis. The mechanical characteristics of epoxy composites were also studied. The gaseous products of thermal oxidative degradation were studied using mass spectrometric analysis. It was found that sodium bicarbonate accelerates the process of thermal oxidative degradation of the epoxy composites in the initial stage, but enhances thermal stability in the final stage. The addition of boric acid to sodium bicarbonate as filler is recommended to improve the thermal stability of the epoxy polymer.

show abstract

Physical Characteristics of Fire-Extinguishing Powders.

Cited by 4 publications

References 0 publications

Modelling of fire-suppressant injection into engine nacelle for various flight regimes

Modelling of fire-suppressant injection into engine nacelle for various flight regimes

Water Mist Fire Suppression Systems for Building and Industrial Applications: Issues and Challenges

Epoxy Composites Filled with Sodium Bicarbonate: Thermal and Mechanical Properties

Contact Info

Product

Resources

About