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Deflagration (Lat: de + flagrare, 'to burn down') is subsonic combustion in which a pre-mixed flame propagates through an explosive or a mixture of fuel and oxidizer. [ 1 ] [ 2 ] Deflagrations in high and low explosives or fuel–oxidizer mixtures may transition to a detonation depending upon confinement and other factors.
The 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. [2] [3]
A schematic diagram of a shock wave situation with the density , velocity , and temperature indicated for each region.. The Rankine–Hugoniot conditions, also referred to as Rankine–Hugoniot jump conditions or Rankine–Hugoniot relations, describe the relationship between the states on both sides of a shock wave or a combustion wave (deflagration or detonation) in a one-dimensional flow in ...
The deflagration-to-detonation transition (DDT) occurred due to the mixture heating and the compression of it. A cooperation between the National Technical University "Kharkiv Polytechnic Institute" and the University of Warmia and Mazury in Olsztyn started to investigate an efficiency of the PCD-system as a detonation gun for coating technology.
Combustion can vary in degree of violence. A deflagration is a propagation of a combustion zone at a velocity less than the speed of sound in the unreacted medium. A detonation is a propagation of a combustion zone at a velocity greater than the speed of sound in the unreacted medium.
Shqip; සිංහල ... Coffee ring effect; ... Deflagration; Degree of ionization; Deposition (chemistry) Derjaguin approximation; Diamond anvil cell ...
Where multiple vessels are connected by piping, ignition of gases in one vessel and pressure piling may result in a deflagration to detonation transition and very large explosion pressure. [ 1 ] In electrical equipment in hazardous areas , if two electrical enclosures are connected by a conduit , an explosion of a gas in one of the compartments ...
In deflagration, decomposition of the explosive material is propagated by a flame front which moves relatively slowly through the explosive material, i.e. at speeds less than the speed of sound within the substance (which is usually still higher than 340 m/s or 1,220 km/h in most liquid or solid materials) [13] in contrast to detonation, which ...