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Detonation

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34: 1494: 228: 2163: 2175: 177:(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. 215:
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.
196:, 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 214:
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
110:. 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 251:
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".
256:' 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 91:
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
122:, 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. 2010: 781:
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
1613: 1112:(5 ed.). Society of Fire Protection Engineers. 2016. Table 70.1 Explosivity Data for representative powders and dusts, page 2770. 33: 1303: 1092: 816:
Edwards, D. H.; Thomas, G. O. & Nettleton, M. A. (1979). "The Diffraction of a Planar Detonation Wave at an Abrupt Area Change".
587: 106:), droplet fogs, or dust suspensions. In addition to dioxygen, oxidants can include halogen compounds, ozone, hydrogen peroxide, and 211:
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
2045: 1898: 1398: 1383: 712: 281: 244: 193: 76: 68: 64: 42: 27: 1023: 418:(5 ed.). Society of Fire Protection Engineers. 2016. p. 390. 1967: 1795: 1760: 1750: 1735: 1715: 1690: 1463: 1458: 1423: 1378: 1326: 802: 309: 204: 111: 84: 1122: 898: 2060: 1770: 1725: 1448: 1438: 1337: 1206: 239:, 2006; detonating the bomb causes fire and smoke to propel upward. 103: 1281: 767: 247:) in the surrounding area. This is a significant distinction from 703:
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
1157: 958: 260:together metals that would otherwise fail to fuse. 488:Bretherick's Handbook of Reactive Chemical Hazards 1806:Penetrant (mechanical, electrical, or structural) 2193: 897:Glaesemann, Kurt R.; Fried, Laurence E. (2007). 79:with speeds about 1 km/sec and differ from 896: 638:Progress report on "Theory of Detonation Waves" 484: 1245:"Don't Waste Your Time Listening for Knock..." 19:For detonation in spark-ignition engines, see 1297: 631: 629: 547: 545: 596:Journal de mathĂ©matiques pures et appliquĂ©es 562:Journal de mathĂ©matiques pures et appliquĂ©es 428: 280:is desired is a problem in some devices. In 63: 'to thunder down/forth') is a type of 1184: 1051: 635: 429:Fickett, Wildon; Davis, William C. (1979). 1614:Hypoxic air technology for fire prevention 1304: 1290: 862:Progress in Astronautics & Aeronautics 626: 542: 271: 1999:Fire Equipment Manufacturers' Association 1036: 935: 660: 658: 485:Urben, Peter; Bretherick, Leslie (2006). 390:. Oxford University Press. Archived from 1332:Boiling liquid expanding vapor explosion 462:American Institute of Chemical Engineers 226: 32: 1978:Listing and approval use and compliance 1110:Handbook of Fire Protection Engineering 1001: 734:Chapman, David Leonard (January 1899). 733: 619:Jouguet, Jacques Charles Émile (1917). 586:Jouguet, Jacques Charles Émile (1906). 585: 552:Jouguet, Jacques Charles Émile (1905). 551: 415:Handbook of Fire Protection Engineering 2194: 1219: 1125:Combustion, Explosion, and Shock Waves 1039:Numerical Simulation of Reactive Flows 938:Fire Prevention Science and Technology 664: 655: 491:(7th ed.). London: Butterworths. 2023:Society of Fire Protection Engineers 1285: 453: 2174: 2017:National Fire Protection Association 1226:Aviation Week & Space Technology 1052:Sharpe, G. J.; Quirk, J. J. (2008). 621:L'Ĺ’uvre scientifique de Pierre Duhem 1311: 736:"On the rate of explosion in gases" 284:, or gasoline engines it is called 13: 1519:Condensed aerosol fire suppression 961:Proceedings of the Royal Society A 460:. Monograph Series. Vol. 10. 457:Fundamentals of fire and explosion 433:. University of California Press. 14: 2218: 1894:Fire alarm notification appliance 1258: 1242: 874:10.2514/5.9781600865497.0341.0357 315:Detonation of an explosive charge 163:Aleksandr Solomonovich Kompaneets 2173: 2162: 2161: 1492: 1098:from the original on 2017-07-05. 16:Explosion at supersonic velocity 1655:Vehicle fire suppression system 1343:Combustibility and flammability 1236: 1213: 1178: 1151: 1116: 1102: 1061:Combustion Theory and Modelling 1045: 1030: 995: 952: 929: 890: 852: 809: 774: 727: 613: 222: 903:Theoretical Chemistry Accounts 525: 515: 505: 478: 454:Stull, Daniel Richard (1977). 447: 422: 406: 372: 276:Unintentional detonation when 1: 2005:Institution of Fire Engineers 1962:Fire Safety Evaluation System 1634:Personal protective equipment 365: 360:Relative effectiveness factor 2076:GHS precautionary statements 1914:Manual fire alarm activation 1172:10.1016/j.fuproc.2009.01.004 707:. New York: Academic Press. 192:. This theory, now known as 7: 1947:Fire protection engineering 1879:Explosive gas leak detector 1696:Electromagnetic door holder 1529:External water spray system 388:British & World English 298: 266:Mojave Air & Space Port 168: 10: 2223: 2123:Harry C. Bigglestone Award 1514:Automatic fire suppression 1454:K-factor (fire protection) 1160:Fuel Processing Technology 818:Journal of Fluid Mechanics 636:von Neumann, John (1942). 380:Oxford Living Dictionaries 25: 18: 2157: 2131: 2110: 2038: 2029:Underwriters Laboratories 1991: 1927: 1864:Aspirating smoke detector 1854: 1663: 1524:Detonation flame arrester 1501: 1490: 1319: 1081:10.1080/13647830701335749 915:10.1007/s00214-007-0303-9 838:10.1017/S002211207900135X 752:10.1080/14786449908621243 568:: 347–425. Archived from 345:Chapman–Jouguet condition 325:Detonation flame arrester 198:Chapman–Jouguet condition 131:Paul Marie Eugène Vieille 1973:Kitchen exhaust cleaning 1889:Fire alarm control panel 1869:Carbon monoxide detector 1846:Standpipe (firefighting) 1609:Gaseous fire suppression 1374:Enthalpy of vaporization 1248:High Performance Academy 687:10.1002/andp.19434350605 293:Pulse detonation engines 262:Pulse detonation engines 139:Henry Louis Le Chatelier 26:Not to be confused with 1816:Pressurisation ductwork 1781:Firewall (construction) 1629:Passive fire protection 1579:Fire suppression system 1137:10.1023/A:1024726619703 746:(284). London: 90–104. 272:In engines and firearms 157:in the early 1940s and 135:Ernest-François Mallard 2202:Explosives engineering 1992:Industry organizations 1957:Fire-resistance rating 1836:Smoke exhaust ductwork 1811:Penetration (firestop) 1801:Packing (firestopping) 1509:Active fire protection 1469:Spontaneous combustion 1041:. Elsevier Publishers. 981:10.1098/rspa.1968.0143 740:Philosophical Magazine 602:: 5–85. Archived from 330:Sympathetic detonation 240: 93:velocity of detonation 57: 45: 2144:Template:Firefighting 2118:Arthur B. Guise Medal 2071:GHS hazard statements 1574:Fire sprinkler system 1554:Fire-retardant fabric 268:on January 31, 2008. 230: 36: 1928:Professions, trades, 1841:Smokeproof enclosure 1701:Electromagnetic lock 1409:Flammability diagram 1320:Fundamental concepts 1037:Oran; Boris (1987). 705:Theory of Detonation 394:on February 22, 2019 207:in some explosives. 1884:Fire alarm call box 1791:Heat and smoke vent 1220:Norris, G. (2008). 1199:2000AIAAJ..38.1698K 1073:2008CTM....12....1S 1016:1974PhFl...17.1547B 973:1968RSPSA.306..171M 830:1979JFM....95...79E 795:2008NatPh...4...72R 679:1943AnP...435..421D 258:explosively welding 159:Yakov B. Zel'dovich 127:Marcellin Berthelot 1856:Fire alarm systems 1671:Annulus (firestop) 1599:Flashback arrestor 1564:Fire-safe polymers 1559:Fire retardant gel 1414:Flammability limit 1275:2014-03-11 at the 667:Annalen der Physik 320:Detonation diamond 241: 108:oxides of nitrogen 46: 2189: 2188: 2097:Safety data sheet 2092:List of S-phrases 2087:List of R-phrases 1983:Sprinkler fitting 1874:Circuit integrity 1746:Fire extinguisher 1584:Firefighting foam 1479:Thermal radiation 1024:10.1063/1.1694932 1004:Physics of Fluids 967:(1485): 171–178. 883:978-0-915928-46-0 498:978-0-123725-63-9 471:978-0-816903-91-7 440:978-0-486-41456-0 305:Carbon detonation 120:hydrogen peroxide 2214: 2177: 2176: 2165: 2164: 2081:Life Safety Code 1686:Compartmentation 1496: 1419:Flammable liquid 1306: 1299: 1292: 1283: 1282: 1252: 1251: 1240: 1234: 1233: 1217: 1211: 1210: 1193:(9): 1698–1708. 1182: 1176: 1175: 1155: 1149: 1148: 1120: 1114: 1113: 1106: 1100: 1099: 1097: 1058: 1049: 1043: 1042: 1034: 1028: 1027: 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Index

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
Aleksandr Solomonovich Kompaneets

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