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Detonation

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45: 1505: 239: 2174: 2186: 188:(CJ) theory, 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. Such a theory describes the chemistry and diffusive transport processes as occurring abruptly as the shock passes. 226:
below them. The influence of increasing the concentration of diluent on expanding individual detonation cells has been elegantly demonstrated. Similarly, their size grows as the initial pressure falls. Since cell widths must be matched with minimum dimension of containment, any wave overdriven by the initiator will be quenched.
207:, admits finite-rate chemical reactions and thus describes a detonation as an infinitesimally thin shock wave, followed by a zone of exothermic chemical reaction. With a reference frame of a stationary shock, the following flow is subsonic, so that an acoustic reaction zone follows immediately behind the lead front, the 225:
Experimental studies have revealed some of the conditions needed for the propagation of such fronts. In confinement, the range of composition of mixes of fuel and oxidant and self-decomposing substances with inerts are slightly below the flammability limits and, for spherically expanding fronts, well
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Both theories describe one-dimensional and steady wavefronts. However, in the 1960s, experiments revealed that gas-phase detonations were most often characterized by unsteady, three-dimensional structures, which can only, in an averaged sense, be predicted by one-dimensional steady theories. Indeed,
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of fuel-air mixture. Compared to deflagration, detonation doesn't need to have an external oxidizer. Oxidizers and fuel mix when deflagration occurs. Detonation is more destructive than deflagrations. In detonation, the flame front travels through the air-fuel faster than sound; while in
121:. Gaseous detonations are often associated with a mixture of fuel and oxidant in a composition somewhat below conventional flammability ratios. They happen most often in confined systems, but they sometimes occur in large vapor clouds. Other materials, such as 262:
where the exothermic wave is subsonic and maximum pressures for non-metal specks of dust are approximately 7–10 times atmospheric pressure. Therefore, detonation is a feature for destructive purposes while deflagration is favored for the acceleration of
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Mallard, Ernest-François; and Le Chatelier, Henry Louis; « Sur les vitesses de propagation de l’inflammation dans les mĂ©langes gazeux explosifs Â» , Comptes rendus hebdomadaires des sĂ©ances de l'AcadĂ©mie des sciences, vol. 93, pp. 145–148,
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Berthelot, Marcellin; and Vieille, Paul Marie Eugène; « Sur la vitesse de propagation des phĂ©nomènes explosifs dans les gaz Â» , Comptes rendus hebdomadaires des sĂ©ances de l'AcadĂ©mie des sciences, vol. 93, pp. 18–22,
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or pinging, and it causes a loss of power. It can also cause excessive heating, and harsh mechanical shock that can result in eventual engine failure. In firearms, it may cause catastrophic and potentially lethal failure.
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Mathematical modeling has steadily advanced to predicting the complex flow fields behind shocks inducing reactions. To date, none has adequately described how the structure is formed and sustained behind unconfined waves.
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Edwards, D. H.; Thomas, G. O.; Nettleton, M. A. (1981). A. K. Oppenheim; N. Manson; R. I. Soloukhin; J. R. Bowen (eds.). "Diffraction of a Planar Detonation in Various Fuel-Oxygen Mixtures at an Area Change".
267:' projectiles. However, detonation waves may also be used for less destructive purposes, including deposition of coatings to a surface or cleaning of equipment (e.g. slag removal) and even 102:
Detonations occur in both conventional solid and liquid explosives, as well as in reactive gases. TNT, dynamite, and C4 are examples of high power explosives that detonate. The
133:, are detonable in the absence of an oxidant (or reductant). In these cases the energy released results from the rearrangement of the molecular constituents of the material. 2021: 792:
Reed, Evan J.; Riad Manaa, M.; Fried, Laurence E.; Glaesemann, Kurt R.; Joannopoulos, J. D. (2007). "A transient semimetallic layer in detonating nitromethane".
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Nikolaev, Yu. A.; Vasil'ev, A. A. & Ul'yanitskii, B. Yu. (2003). "Gas Detonation and its Application in Engineering and Technologies (Review)".
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in solid and liquid explosives is much higher than that in gaseous ones, which allows the wave system to be observed with greater detail (higher
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are a form of pulsed jet engine that has been experimented with on several occasions as this offers the potential for good fuel efficiency.
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use the detonation wave for aerospace propulsion. The first flight of an aircraft powered by a pulse detonation engine took place at the
1624: 1123:(5 ed.). Society of Fire Protection Engineers. 2016. Table 70.1 Explosivity Data for representative powders and dusts, page 2770. 44: 1314: 1103: 827:
Edwards, D. H.; Thomas, G. O. & Nettleton, M. A. (1979). "The Diffraction of a Planar Detonation Wave at an Abrupt Area Change".
598: 117:), droplet fogs, or dust suspensions. In addition to dioxygen, oxidants can include halogen compounds, ozone, hydrogen peroxide, and 222:
such waves are quenched as their structure is destroyed. The Wood-Kirkwood detonation theory can correct some of these limitations.
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Huque, Z.; Ali, M. R. & Kommalapati, R. (2009). "Application of pulse detonation technology for boiler slag removal".
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When used in explosive devices, the main cause of damage from a detonation is the supersonic blast front (a powerful
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Döring, Werner (1943). ""Über den Detonationsvorgang in Gasen"" ["On the detonation process in gases"].
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Nettleton, M. A. (1980). "Detonation and flammability limits of gases in confined and unconfined situations".
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Munday, G.; Ubbelohde, A. R. & Wood, I. F. (1968). "Fluctuating Detonation in Gases".
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Barthel, H. O. (1974). "Predicted Spacings in Hydrogen-Oxygen-Argon Detonations".
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propagating directly in front of it. Detonations propagate supersonically through
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Kailasanath, K. (2000). "Review of Propulsion Applications of Detonation Waves".
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The simplest theory to predict the behaviour of detonations in gases is known as
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in 1905, 1906 and 1917. The next advance in understanding detonation was made by
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The London, Edinburgh, and Dublin Philosophical Magazine and Journal of Science
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deflagration, the flame front travels through the air-fuel slower than sound.
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Chapman, David Leonard (1899). "VI. On the rate of explosion in gases",
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A more complex theory was advanced during World War II independently by
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exothermic front accelerating through a medium that eventually drives a
2056: 1909: 1409: 1394: 723: 292: 255: 204: 87: 79: 75: 53: 38: 1034: 429:(5 ed.). Society of Fire Protection Engineers. 2016. p. 390. 1978: 1806: 1771: 1761: 1746: 1726: 1701: 1474: 1469: 1434: 1389: 1337: 813: 320: 215: 122: 95: 1133: 909: 2071: 1781: 1736: 1459: 1449: 1348: 1217: 250:, 2006; detonating the bomb causes fire and smoke to propel upward. 114: 1292: 778: 258:) in the surrounding area. This is a significant distinction from 714:
Zel'dovich, Yakov B.; Kompaneets, Aleksandr Solomonovich (1960).
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which have subsonic flame speeds about 1 m/sec. Detonation is an
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Detonation was discovered in 1881 by four French scientists
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National Council of Examiners for Engineering and Surveying
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GALCIT Explosion Dynamics Laboratory Detonation Database
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There is also some evidence that the reaction zone is
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A very wide variety of fuels may occur as gases (e.g.
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Youtube video demonstrating physics of a blast wave
1168: 969: 271:together metals that would otherwise fail to fuse. 499:Bretherick's Handbook of Reactive Chemical Hazards 1817:Penetrant (mechanical, electrical, or structural) 2204: 908:Glaesemann, Kurt R.; Fried, Laurence E. (2007). 90:with speeds about 1 km/sec and differ from 907: 649:Progress report on "Theory of Detonation Waves" 495: 1256:"Don't Waste Your Time Listening for Knock..." 30:For detonation in spark-ignition engines, see 1308: 642: 640: 558: 556: 607:Journal de mathĂ©matiques pures et appliquĂ©es 573:Journal de mathĂ©matiques pures et appliquĂ©es 439: 291:is desired is a problem in some devices. In 74: 'to thunder down/forth') is a type of 1195: 1062: 646: 440:Fickett, Wildon; Davis, William C. (1979). 1625:Hypoxic air technology for fire prevention 1315: 1301: 873:Progress in Astronautics & Aeronautics 637: 553: 282: 2010:Fire Equipment Manufacturers' Association 1047: 946: 671: 669: 496:Urben, Peter; Bretherick, Leslie (2006). 401:. Oxford University Press. Archived from 1343:Boiling liquid expanding vapor explosion 473:American Institute of Chemical Engineers 237: 43: 1989:Listing and approval use and compliance 1121:Handbook of Fire Protection Engineering 1012: 745:Chapman, David Leonard (January 1899). 744: 630:Jouguet, Jacques Charles Émile (1917). 597:Jouguet, Jacques Charles Émile (1906). 596: 563:Jouguet, Jacques Charles Émile (1905). 562: 426:Handbook of Fire Protection Engineering 14: 2205: 1230: 1136:Combustion, Explosion, and Shock Waves 1050:Numerical Simulation of Reactive Flows 949:Fire Prevention Science and Technology 675: 666: 502:(7th ed.). London: Butterworths. 2034:Society of Fire Protection Engineers 1296: 464: 2185: 2028:National Fire Protection Association 1237:Aviation Week & Space Technology 1063:Sharpe, G. J.; Quirk, J. J. (2008). 632:L'Ĺ’uvre scientifique de Pierre Duhem 1322: 747:"On the rate of explosion in gases" 295:, or gasoline engines it is called 24: 1530:Condensed aerosol fire suppression 972:Proceedings of the Royal Society A 471:. Monograph Series. Vol. 10. 468:Fundamentals of fire and explosion 444:. University of California Press. 25: 2229: 1905:Fire alarm notification appliance 1269: 1253: 885:10.2514/5.9781600865497.0341.0357 326:Detonation of an explosive charge 174:Aleksandr Solomonovich Kompaneets 2184: 2173: 2172: 1503: 1109:from the original on 2017-07-05. 27:Explosion at supersonic velocity 1666:Vehicle fire suppression system 1354:Combustibility and flammability 1247: 1224: 1189: 1162: 1127: 1113: 1072:Combustion Theory and Modelling 1056: 1041: 1006: 963: 940: 901: 863: 820: 785: 738: 624: 233: 914:Theoretical Chemistry Accounts 536: 526: 516: 489: 465:Stull, Daniel Richard (1977). 458: 433: 417: 383: 287:Unintentional detonation when 13: 1: 2016:Institution of Fire Engineers 1973:Fire Safety Evaluation System 1645:Personal protective equipment 376: 371:Relative effectiveness factor 2087:GHS precautionary statements 1925:Manual fire alarm activation 1183:10.1016/j.fuproc.2009.01.004 718:. New York: Academic Press. 203:. This theory, now known as 7: 1958:Fire protection engineering 1890:Explosive gas leak detector 1707:Electromagnetic door holder 1540:External water spray system 399:British & World English 309: 277:Mojave Air & Space Port 179: 10: 2234: 2134:Harry C. Bigglestone Award 1525:Automatic fire suppression 1465:K-factor (fire protection) 1171:Fuel Processing Technology 829:Journal of Fluid Mechanics 647:von Neumann, John (1942). 391:Oxford Living Dictionaries 36: 29: 2168: 2142: 2121: 2049: 2040:Underwriters Laboratories 2002: 1938: 1875:Aspirating smoke detector 1865: 1674: 1535:Detonation flame arrester 1512: 1501: 1330: 1092:10.1080/13647830701335749 926:10.1007/s00214-007-0303-9 849:10.1017/S002211207900135X 763:10.1080/14786449908621243 579:: 347–425. Archived from 356:Chapman–Jouguet condition 336:Detonation flame arrester 209:Chapman–Jouguet condition 142:Paul Marie Eugène Vieille 1984:Kitchen exhaust cleaning 1900:Fire alarm control panel 1880:Carbon monoxide detector 1857:Standpipe (firefighting) 1620:Gaseous fire suppression 1385:Enthalpy of vaporization 1259:High Performance Academy 698:10.1002/andp.19434350605 304:Pulse detonation engines 273:Pulse detonation engines 150:Henry Louis Le Chatelier 37:Not to be confused with 1827:Pressurisation ductwork 1792:Firewall (construction) 1640:Passive fire protection 1590:Fire suppression system 1148:10.1023/A:1024726619703 757:(284). London: 90–104. 283:In engines and firearms 168:in the early 1940s and 146:Ernest-François Mallard 2213:Explosives engineering 2003:Industry organizations 1968:Fire-resistance rating 1847:Smoke exhaust ductwork 1822:Penetration (firestop) 1812:Packing (firestopping) 1520:Active fire protection 1480:Spontaneous combustion 1052:. Elsevier Publishers. 992:10.1098/rspa.1968.0143 751:Philosophical Magazine 613:: 5–85. Archived from 341:Sympathetic detonation 251: 104:velocity of detonation 68: 56: 2155:Template:Firefighting 2129:Arthur B. Guise Medal 2082:GHS hazard statements 1585:Fire sprinkler system 1565:Fire-retardant fabric 279:on January 31, 2008. 241: 47: 1939:Professions, trades, 1852:Smokeproof enclosure 1712:Electromagnetic lock 1420:Flammability diagram 1331:Fundamental concepts 1048:Oran; Boris (1987). 716:Theory of Detonation 405:on February 22, 2019 218:in some explosives. 1895:Fire alarm call box 1802:Heat and smoke vent 1231:Norris, G. (2008). 1210:2000AIAAJ..38.1698K 1084:2008CTM....12....1S 1027:1974PhFl...17.1547B 984:1968RSPSA.306..171M 841:1979JFM....95...79E 806:2008NatPh...4...72R 690:1943AnP...435..421D 269:explosively welding 170:Yakov B. Zel'dovich 138:Marcellin Berthelot 1867:Fire alarm systems 1682:Annulus (firestop) 1610:Flashback arrestor 1575:Fire-safe polymers 1570:Fire retardant gel 1425:Flammability limit 1286:2014-03-11 at the 678:Annalen der Physik 331:Detonation diamond 252: 119:oxides of nitrogen 57: 2200: 2199: 2108:Safety data sheet 2103:List of S-phrases 2098:List of R-phrases 1994:Sprinkler fitting 1885:Circuit integrity 1757:Fire extinguisher 1595:Firefighting foam 1490:Thermal radiation 1035:10.1063/1.1694932 1015:Physics of Fluids 978:(1485): 171–178. 894:978-0-915928-46-0 509:978-0-123725-63-9 482:978-0-816903-91-7 451:978-0-486-41456-0 316:Carbon detonation 131:hydrogen peroxide 16:(Redirected from 2225: 2188: 2187: 2176: 2175: 2092:Life Safety Code 1697:Compartmentation 1507: 1430:Flammable liquid 1317: 1310: 1303: 1294: 1293: 1263: 1262: 1251: 1245: 1244: 1228: 1222: 1221: 1204:(9): 1698–1708. 1193: 1187: 1186: 1166: 1160: 1159: 1131: 1125: 1124: 1117: 1111: 1110: 1108: 1069: 1060: 1054: 1053: 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Index

Detonate
Engine knocking
Denotation

TNT
shock wave
Latin
detonare
combustion
supersonic
shock front
shock waves
deflagrations
explosion
velocity of detonation
resolution
hydrogen
oxides of nitrogen
acetylene
ozone
hydrogen peroxide
Marcellin Berthelot
Paul Marie Eugène Vieille
Ernest-François Mallard
Henry Louis Le Chatelier
David Chapman
Émile Jouguet
John von Neumann
Werner Döring
Yakov B. Zel'dovich

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