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Topic: Deflagration


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In the News (Tue 21 May 19)

  
  Pulse Detonation Engine
Deflagration is what happens when you burn a mixture of air and fuel at reasonably low pressure.
Deflagration is, believe it or not, a relatively gentle process which is simply the rapid burning the fuel.
One of the primary attributes of deflagration is that the flame travels at a speed significantly lower than the speed of sound.
aardvark.co.nz /pjet/pde.shtml   (1247 words)

  
  Deflagration - Wikipedia, the free encyclopedia
Deflagration is a process of subsonic combustion that usually propagates through thermal conductivity (hot burning material heats the next layer of cold material and ignites it).
Deflagration is different from detonation which is supersonic and propagates through shock compression.
Typical examples of deflagrations are combustion of a gas-air mixture in a gas stove or a fuel-air mixture in an internal combustion engine, a rapid burning of a gunpowder in a firearm or pyrotechnic mixtures in fireworks.
en.wikipedia.org /wiki/Deflagration   (385 words)

  
 Safety Report Assessment Guide: Chemical warehouses hazards
Unfortunately there are two distinct types of explosion which are referred to as deflagration and detonation and these tend to be confused in the literature on account of the fact that the effects of deflagration and detonations are not always a clear guide to the nature of the explosion.
The velocity of the deflagration front in a solid in the open air is quite different from that in a solid contained in a closed vessel, because the velocity of reaction front increases with the pressure exerted on the solid by the combustion gases.
Deflagration is not constrained by dimensions and is said to occur when a subsonic combustion generated pressure wave moves through the material.
www.hse.gov.uk /comah/sragcwh/hazards/haz5.htm   (2528 words)

  
 Solid State Technology - Challenges and solutions for germane (GeH4) packaging
Deflagration is defined as the chemical reaction of a substance in which the reaction front advances into the unreacted substance at less than sonic velocity.
Deflagration of germane was induced with adsorbent loadings of 0%, 30%, and 90%/unit volume.
Deflagration of germane inside the primary reactor was induced by applying 6 VDC to a 0.25mm nichrome fuse wire for a pre-set period of time.
sst.pennnet.com /Articles/Article_Display.cfm?Section=Articles&Subsection=Display&Article_ID=178195   (2347 words)

  
 Deflagration: Facts and details from Encyclopedia Topic   (Site not responding. Last check: 2007-10-21)
Deflagration is a process of subsonic combustion that usually propagates through thermoconductivity (hot burning material heats next layer of cold material and ignites it).
Deflagration is different from detonation detonation quick summary:
Combustion or burning is an exothermic reaction between a substance (the fuel) and a gas (the oxidizer) to release heat....
www.absoluteastronomy.com /encyclopedia/d/de/deflagration.htm   (912 words)

  
 [No title]   (Site not responding. Last check: 2007-10-21)
A deflagration is a combustion wave propagating at less than the speed of sound as measured in unburned gas immediately ahead of the flame front.
A severe deflagration arrestment test involves placing a restricting orifice behind the arrestor (that is, upstream relative to the direction of wave propagation).
Such "restricted end"deflagration testing constitutes a severe deflagration arrestment test, yet such testing is believed to represent an operating environment that can exist in fact from various conditions, such as when, for example, a closed or partially closed valve in a pipe is located upstream from a functioning arrestor in the pipeline.
www.wipo.int /cgi-pct/guest/getbykey5?KEY=03/83369.031009&ELEMENT_SET=DECL   (5085 words)

  
 Pulse Detonation Engine
Deflagration is what happens when you burn a mixture of air and fuel at reasonably low pressure.
Deflagration is, believe it or not, a relatively gentle process which is simply the rapid burning the fuel.
This tube is sometimes referred to as a DDT (Deflagration to Detonation Transition) tube and its job is to force the trigger charge to burn at a rate that creates a supersonic shockwave.
www.aardvark.co.nz /pjet/pde.shtml   (1247 words)

  
 Pulse detonation engine - Wikipedia, the free encyclopedia
All regular jet engines and most rocket engines operate on the deflagration of fuel — that is, the rapid but subsonic combustion of fuel.
Detonation is inherently more efficient than deflagration, thus while the maximum energy efficiency of most types of jet engines is around 30%, a PDE can attain an efficiency theoretically near 50%.
While it is possible to start a detonation directly with a large spark, the amount of energy input is very large and is not practical for an engine.
en.wikipedia.org /wiki/Pulse_detonation_engine   (990 words)

  
 Detonation - Wikipedia, the free encyclopedia
Detonation is a process of supersonic combustion that involves a shock wave and a reaction zone behind it.
It is the more powerful of the two forms of explosion, the other one being deflagration.
This self-sustained detonation wave is different from a deflagration that propagates with a subsonic speed and without a shock.
en.wikipedia.org /wiki/Detonation   (359 words)

  
 Explosion Theory
Deflagration is a rapid chemical reaction in which the output of heat is enough to enable the reaction to proceed and be accelerated without input of heat from another source.
Deflagration is a surface phenomenon with the reaction products flowing away from the un-reacted material along the surface at subsonic velocity.
The effect of a true deflagration under confinement is an explosion.
www.fireandsafety.eku.edu /VFRE-99/Theory/Definitions/definitions-1.htm   (1082 words)

  
 UXOInfo.com Ordnance Hazards   (Site not responding. Last check: 2007-10-21)
Before the effects and hazards of an explosion can be described the reader must understand the difference between deflagration and detonation.
Deflagration (Rapid Combustion) Deflagration is the rapid combustion or rapid burning of an explosive.
Detonation (Instantaneous Combustion) Detonation can be defined as most rapid form of combustion and is often times referred to as "instantaneous combustion." However, detonation is not exactly instantaneous there is a short time interval (microseconds) for the combustion action to transfer from one particle of the explosive compound to the next.
www.uxoinfo.com /uxoinfo/ordhazards.cfm   (1113 words)

  
 Energy Citations Database (ECD) - Energy and Energy-Related Bibliographic Citations
The type of combustion (i.e., deflagration or detonation) supported by a two-step reaction scheme is studied as a function of the activation energies.
It is shown that both a deflagration to detonation transition and a deflagration wave that lags behind a leading shock are possible.
Two types of deflagration to detonation transitions are found theoretically: initiation of detonation from the flame zone and initiation of detonation along a contact discontinuity in the compressed gas near the primary shock wave.
www.osti.gov /energycitations/product.biblio.jsp?osti_id=63253   (222 words)

  
 Humanitarian Demining Technologies - Can Currently Developed Deflagration Systems Neutralize Hard Case Mines?   (Site not responding. Last check: 2007-10-21)
Burning or combustion of the main charge of a mine is achieved by a chemicals, thermite, pyrotechnics, and propellants.
This is a new approach for neutralizing mines by deflagration in lieu of explosives.
Three different deflagration systems, the Humanitarian Demining Flare, FireAnt and Mine Incinerator were investigated for their ability to neutralize AP stake mines and bounding fragmentation mines.
www.humanitarian-demining.org /demining/pubs/neutral/deflagration.asp   (2622 words)

  
 D
Deflagration, although classed as an explosion, generally implies the burning of a substance with self-contained oxygen so that the reaction zone advances into the unreacted material at less than the velocity of sound in the material.
In this case, heat is transferred from the reacted to the unreacted material by conduction and convection.
Detonation velocities lie in the approximate range of 1,400 to 9,000 m/s = 5,000 to 30,000 ft/s; slower explosive reactions, which are propagated by thermal conduction and radiation, are known as deflagration.
www.hydrocut.com /Terms/D.html   (2740 words)

  
 DMusic.com | for indie musicians and fans | Free MP3 music downloads - Deflagration - Biography
DEFLAGRATION projects as intense of a stage show and image as their music.
DEFLAGRATION continues to do everything they can to reach a broader audience and play as many shows they can.
With the help of their fans and friends DEFLAGRATION will be forcing everyone to either get on the bus and take a ride or get the f*#k out of the way.
deflagration.dmusic.com /bio   (211 words)

  
 SN Ia Theory   (Site not responding. Last check: 2007-10-21)
Burning front and density distribution in a pure deflagration model of an exploding CO white dwarf.
Deflagration front (colored) and detonation front (gray) in two 3D delayed detonation models with different transition time.
The colors indicate the distance of the deflagration front from the white dwarf center and thus help to illustrate its expansion.
www.astro.uu.nl /~langer/f3/transients/snIath.html   (634 words)

  
 ASC Center for Astrophysical Thermonuclear Flashes
Neither deflagration nor detonation alone can account for both the abundances of intermediate-mass nuclei, and the abundances of iron-peak nuclei as well as the large expansion velocity of the ejecta that are produced in a Type Ia supernova.
This deflagration wave may rapidly die out, due to the shallower depth of the accreted matter away from the magnetic polar cap, or may reach the opposite magnetic polar cap, igniting the accreted matter that is pooled there.
However, the speed of the deflagration front is likely to be highly subsonic; indeed, the propagation of the front is so slow that the use of the explicit schemes that can be successfully used to model (for example) detonation waves is not sensible.
flash.uchicago.edu /website/research/home.py?submit=science.txt   (2602 words)

  
 Product Range   (Site not responding. Last check: 2007-10-21)
Deflagration flame arrestors are available with either gauze pack elements or crimped metal ribbon construction.
Therefore, if flow rate and pressure drop are critical, then a deflagration flame arrestor is often preferable to the comparable detonation arrestor.
In critical installations it may be desirable to be able to switch to a standby line while flame arrestor inspection and maintenance occur.
www.elmac.info /safety/productrange.html   (1058 words)

  
 Flammer GmbH, D-74389 Cleebronn: Deflagrations Flame Arresters
In this case, securing the protected side with a deflagration flame arrester will be sufficient.
In general, a deflagration flame arrester operates at a lower pressure drop than a detonation flame arrester.
Our deflagration flame arresters for pipes feature low pressure drop and they are small in size.
www.flammergmbh.de /englisch/products/deflagrations_flame_arresters.htm   (181 words)

  
 www.risi-usa.com: tf
The deflagration rate of an explosive consists of the chemical burning of the material wherein its propagation rates are dependent on chemical kinetics.
The differences between detonation and deflagration are extreme; both phenomena are used to perform specific functions.
In general, a detonation is used for fracturing without the use of a pressure buildup; whereas a deflagration builds up a pressure which in turn performs useful work.
www.risi-usa.com /0products/8td/page01.html   (298 words)

  
 Tank protection division - understanding/specifying flame & detonation arresters
A flame arrester that is mounted at the end of a pipe (flanged or threaded inlet connection) and which vents directly to the atmosphere.
Such an overdriven detonation is a short lived phenomenon and usually occurs as the flame front is transitioning from a high speed (near the speed of sound) deflagration to a detonation.
A deflagration may develop in the atmosphere as an unconfined deflagration, or in an enclosed area, typically a piping system, as a confined deflagration.
www.protectoseal.com /fdatrain.html   (1631 words)

  
 June 29, 2000, Board letter enclosing a staff issue report on the safety controls for the mobilization and removal of ...
The primary safety concern is the potential for a hydrogen deflagration in Tank 8 due to hydrogen released from the waste during slurry pump operation.
The primary safety concern for Tank 8 operations is the potential for hydrogen deflagration due to the release of trapped hydrogen gas during operation of the slurry pump.
After a 1997 positive Unreviewed Safety Question Determination regarding the potential for hydrogen deflagration in SRS high-level waste tanks, a Justification for Continued Operation was implemented to prevent operation of the slurry pump without further analysis and appropriate controls.
www.deprep.org /2000/FB00U29A.HTM   (1666 words)

  
 Flammable Vapor Deflagration Unraveled in Industrial Oven - Dust Explosion Prevention And Mitigation By CV TECHNOLOGY
The deflagration was controlled by explosion vents on the oven and there were not injuries.
The deflagration occurred after a power outage that resulted in a loss of airflow through the oven.
CV Technology combines a legacy of experienced explosion consulting with revolutionary and completely unique explosion prevention and explosion protection technologies to specialize in the prevention, protection, and elimination of dust explosion hazards in all industries which process powders and dry bulk materials.
www.cvtechnology.com /pr_20060707-deflagration-industrial-oven.htm   (572 words)

  
 Blasting Caps
Deflagration is the simple burning of a propellant or explosive.
The ammonium nitrate cargos of the High Flyer and Grandcamp are said to possibly have undergone this type of deflagration to detonation transition.
One of the characteristic differences of deflagration and detonation is the flow of the byproducts.
www.angelfire.com /co2/contem/blasting.html   (13228 words)

  
 Detonation chemistry (Arno Hahma)
In a deflagration, you end up with about the theoretical composition including the close surroundings, such as air (AlN is a major product, too).
In case of flash powder, the difference can not be heard, as the whole detonation is a sort of a deflagration at the same time.
If the deflagration or the expanding gases are considerably faster than 330 m/s (sound velocity in air), it will cause a shockwave in the surrounding air.
yarchive.net /explosives/detonation_chemistry.html   (1758 words)

  
 PDE FAQ
Deflagration is the familiar everyday combustion observed when a match is struck.
The deflagration wave, through a process called deflagration-to-detonation transition (DDT), is accelerated into a phenomenon known as a detonation.
Unlike a deflagration, which travels at subsonic speeds and only produces peak pressure rises of two to three times atmospheric pressure, a detonation travels at Mach 5-6 and produces peak pressure rises of 30 to 100 atm.
www.innssi.com /pde01.htm   (935 words)

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