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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]
Eberhard effect (science of photography) Edge effect (ecological succession) (ecology) Edison effect (atomic physics) (electricity) (Thomas Edison) (vacuum tubes) Efimov effect (physics) Einstein effect (disambiguation), several different effects in physics; Einstein–de Haas effect (science) Electro-optic effect (nonlinear optics)
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 ...
A Guide to the Scientific Knowledge of Things Familiar, also known as The Guide to Science or Brewer's Guide to Science, is a book by Ebenezer Cobham Brewer presenting explanations for common phenomena. [1] First published in the United Kingdom around 1840, the book is laid out in the style of a catechism and proved very popular.
HEVR dispersal defined as an explosion or "violent" reaction that outside of a laboratory or test-range environment can only be described as a continuum from violent deflagration to detonation (assumed 100% aerosolization).
For example, uranium-237 is a unique thermonuclear explosion marker, as it is produced by a (n,2n) reaction from uranium-238, with the minimal neutron energy needed being about 5.9 MeV. Considerable amounts of neptunium-239 and uranium-237 are indicators of a fission-fusion-fission explosion.
The simplest theory to predict the behaviour of detonations in gases is known as the Chapman–Jouguet (CJ) condition, developed around the turn of the 20th century. This theory, described by a relatively simple set of algebraic equations, models the detonation as a propagating shock wave accompanied by exothermic heat release.