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- Deflagration_to_detonation_transition abstract "Deflagration to detonation transition (DDT) refers to a phenomenon in ignitable mixtures of a flammable gas and air (or oxygen) when a sudden transition takes place from a deflagration type of combustion to a detonation type of combustion. The effects of a detonation are usually devastating.A deflagration is characterized by a subsonic flame propagation velocity, typically far below 100 m/s, and relatively modest overpressures, say below 0.5 bar. The main mechanism of combustion propagation is of a flame front that moves forward through the gas mixture - in technical terms the reaction zone (chemical combustion) progresses through the medium by processes of diffusion of heat and mass. In its most benign form, a deflagration may simply be a flash fire. In contrast, a detonation is characterized by supersonic flame propagation velocities, perhaps up to 2000 m/s, and substantial overpressures, up to 20 bars. The main mechanism of combustion propagation is of a powerful pressure wave that compresses the unburnt gas ahead of the wave to a temperature above the autoignition temperature. In technical terms, the reaction zone (chemical combustion) is a self-driven shock wave where the reaction zone and the shock are coincident, and the chemical reaction is initiated by the compressive heating caused by the shock wave.Under certain conditions, mainly in terms of geometrical conditions such as partial confinement and many obstacles in the flame path that cause turbulent flame eddy currents, a subsonic flame may accelerate to supersonic speed, transitioning from deflagration to detonation. The exact mechanism is not fully understood, and while existing theories are able to explain and model both deflagrations and detonations, there is no theory at present which can predict the transition phenomenon.A deflagration to detonation transition has been a feature of several major industrial accidents 1970 Propane vapour cloud explosion in Port Hudson The Flixborough disaster The 1989 Phillips Disaster in Pasadena, Texas The damage observed in the Buncefield fire, see the 2005 Hertfordshire Oil Storage Terminal fireThe phenomenon is exploited in pulse detonation engines because a detonation produces a more efficient combustion of the reactants than a deflagration does, i.e. giving a higher yields. Such engines typically employ a Shchelkin spiral in the combustion chamber to facilitate the deflagration to detonation transition.The mechanism has found military use in the thermobaric weapon.A deflagration to detonation transition (DDT) has also been proposed for thermonuclear reactions responsible for supernovae initiation; see also Carbon detonation.Apart from the name, this phenomenon is completely unrelated to the chemical combustion and flame acceleration phenomenon.".
- Deflagration_to_detonation_transition wikiPageExternalLink hsl02-02.pdf.
- Deflagration_to_detonation_transition wikiPageID "23375296".
- Deflagration_to_detonation_transition wikiPageLength "5111".
- Deflagration_to_detonation_transition wikiPageOutDegree "37".
- Deflagration_to_detonation_transition wikiPageRevisionID "628165559".
- Deflagration_to_detonation_transition wikiPageWikiLink 1970_Propane_vapor_cloud_explosion_in_Port_Hudson.
- Deflagration_to_detonation_transition wikiPageWikiLink Atmosphere_of_Earth.
- Deflagration_to_detonation_transition wikiPageWikiLink Autoignition_temperature.
- Deflagration_to_detonation_transition wikiPageWikiLink Bar_(unit).
- Deflagration_to_detonation_transition wikiPageWikiLink Boiling_liquid_expanding_vapor_explosion.
- Deflagration_to_detonation_transition wikiPageWikiLink Buncefield_fire.
- Deflagration_to_detonation_transition wikiPageWikiLink Carbon_detonation.
- Deflagration_to_detonation_transition wikiPageWikiLink Category:Combustion.
- Deflagration_to_detonation_transition wikiPageWikiLink Category:Explosives_engineering.
- Deflagration_to_detonation_transition wikiPageWikiLink Category:Industrial_fires_and_explosions.
- Deflagration_to_detonation_transition wikiPageWikiLink Combustion.
- Deflagration_to_detonation_transition wikiPageWikiLink Combustion_chamber.
- Deflagration_to_detonation_transition wikiPageWikiLink Deflagration.
- Deflagration_to_detonation_transition wikiPageWikiLink Detonation.
- Deflagration_to_detonation_transition wikiPageWikiLink Eddy_current.
- Deflagration_to_detonation_transition wikiPageWikiLink Flammability.
- Deflagration_to_detonation_transition wikiPageWikiLink Flash_fire.
- Deflagration_to_detonation_transition wikiPageWikiLink Flixborough_disaster.
- Deflagration_to_detonation_transition wikiPageWikiLink Metre_per_second.
- Deflagration_to_detonation_transition wikiPageWikiLink Overpressure.
- Deflagration_to_detonation_transition wikiPageWikiLink Oxygen.
- Deflagration_to_detonation_transition wikiPageWikiLink Phase_velocity.
- Deflagration_to_detonation_transition wikiPageWikiLink Phillips_disaster_of_1989.
- Deflagration_to_detonation_transition wikiPageWikiLink Pressure.
- Deflagration_to_detonation_transition wikiPageWikiLink Pressure_piling.
- Deflagration_to_detonation_transition wikiPageWikiLink Pulse_detonation_engine.
- Deflagration_to_detonation_transition wikiPageWikiLink Shchelkin_spiral.
- Deflagration_to_detonation_transition wikiPageWikiLink Shock_wave.
- Deflagration_to_detonation_transition wikiPageWikiLink Speed_of_sound.
- Deflagration_to_detonation_transition wikiPageWikiLink Supernova.
- Deflagration_to_detonation_transition wikiPageWikiLink Supersonic_speed.
- Deflagration_to_detonation_transition wikiPageWikiLink Temperature.
- Deflagration_to_detonation_transition wikiPageWikiLink Thermobaric_weapon.
- Deflagration_to_detonation_transition wikiPageWikiLink Work_accident.
- Deflagration_to_detonation_transition wikiPageWikiLinkText "DDT".
- Deflagration_to_detonation_transition wikiPageWikiLinkText "Deflagration to detonation transition".
- Deflagration_to_detonation_transition wikiPageWikiLinkText "deflagration to detonation transition".
- Deflagration_to_detonation_transition wikiPageWikiLinkText "transition between deflagration and detonation".
- Deflagration_to_detonation_transition wikiPageUsesTemplate Template:Cite_book.
- Deflagration_to_detonation_transition wikiPageUsesTemplate Template:Dubious.
- Deflagration_to_detonation_transition subject Category:Combustion.
- Deflagration_to_detonation_transition subject Category:Explosives_engineering.
- Deflagration_to_detonation_transition subject Category:Industrial_fires_and_explosions.
- Deflagration_to_detonation_transition type Accident.
- Deflagration_to_detonation_transition type Process.
- Deflagration_to_detonation_transition comment "Deflagration to detonation transition (DDT) refers to a phenomenon in ignitable mixtures of a flammable gas and air (or oxygen) when a sudden transition takes place from a deflagration type of combustion to a detonation type of combustion. The effects of a detonation are usually devastating.A deflagration is characterized by a subsonic flame propagation velocity, typically far below 100 m/s, and relatively modest overpressures, say below 0.5 bar.".
- Deflagration_to_detonation_transition label "Deflagration to detonation transition".
- Deflagration_to_detonation_transition sameAs Q5251647.
- Deflagration_to_detonation_transition sameAs DDT_(火薬学).
- Deflagration_to_detonation_transition sameAs m.06w49xk.
- Deflagration_to_detonation_transition sameAs Q5251647.
- Deflagration_to_detonation_transition wasDerivedFrom Deflagration_to_detonation_transition?oldid=628165559.
- Deflagration_to_detonation_transition isPrimaryTopicOf Deflagration_to_detonation_transition.