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Definition of detonate in the Definitions.net dictionary. Meaning of detonate. What does detonate mean? Information and translations of detonate in the most.
A process of chemical transformation of an explosive that is accompanied by liberation of energy and that propagates through the substance as waves from one layer to another with supersonic speed. The chemical reaction is introduced by an intense shock wave, which forms the leading front of the detonation wave. Because of the sharp rise in temperature and pressure behind the front of the shock wave, the chemical transformation takes place extremely rapidly in the very narrow layer immediately adjacent to the wave front (see Figure 1). Diagram of a detonation wave: (A) shock wave front. The arrow shows the direction of propagation of the wave.The energy liberated in the zone of chemical reaction continuously maintains a high pressure in the shock wave.
Thus, detonation is a self-supporting process.The excitation of detonation is the usual means of producing explosions. In an explosive charge, detonation creates an intense mechanical or thermal action (shock, spark discharge, or explosion of a metal wire by an electric current). The force of the action required to cause detonation depends on the chemical nature of the explosive. Substances sensitive to mechanical action include the so-called detonating powders (mercury fulminate and lead azide); they are usually a component of fulminating detonators, which are used to excite detonation of secondary (less sensitive) explosives.In a homogeneous explosive, detonation usually propagates at a constant velocity, which is the minimum possible rate of propagation for a detonation wave in the given substance. In a detonation wave that is propagating with minimum velocity, the chemical reaction zone shifts with the speed of sound relative to the reaction products (but at super-sonic velocity with respect to the initial material).
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Because of this, rarefaction waves, which form upon the expansion of the products of the chemical reaction, cannot penetrate the reaction zone and weaken the shock wave that precedes it. A detonation corresponding to the above conditions is called a Chapman-Jouget process. The minimum rate of propagation that corresponds to the process is used as a characteristic of the explosive (see Table 1). The pressure created during the propagation of a detonation wave in a gaseous explosive is dozens of atmospheres; in liquid and solid explosives it is measured in hundreds of thousands of atmospheres. Engine cylinder pressure in normal combustion and in detonation. Differences in development of peak pressure values in both cases may be noted.An explosion.
A spontaneous, or exceedingly rapid, combustion of a fuel-air mixture after normal ignition inside the combustion chamber at a temperature and pressure critical to a particular type of gasoline, causing an explosion. The explosion is the result of a high-speed heat wave passing through the charge. Detonation occurs if the burning rate of the fuel is not compatible with the compression ratio and the spark plug advance. The most common indication of detonation is a high cylinder-head temperature. Throttle reduction is the most immediate and surest remedy.Want to thank TFD for its existence?, add a link to this page, or visit.Link to this page.
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