What is the difference between detonations and deflagration?
Deflagrations and detonations A deflagration occurs when a flame front propagates by transferring heat and mass to the unburned air–vapor mixture ahead of the front. A detonation occurs when the flame velocity reaches supersonic speeds above 600 m/s and generally in the 2000–2500 m/s range.
What is a deflagration panel?
Deflagration protection systems vent the combustion gases and pressures from withing a building or structure so that structural or mechanical damage is minimised after a deflagration event.
What is a deflagration hazard?
Deflagration is a term often used to describe combustible dust explosions. In a dust explosion, the deflagration processes happens so rapidly that the heated air and gaseous fire products (such as carbon dioxide) produce extreme air pressure that can blow out walls and destroy structures.
What type of reaction are combustion deflagration and detonation?
Unsourced material may be challenged and removed. Deflagration to detonation transition (DDT) refers to a phenomenon in ignitable mixtures of a flammable gas and air (or oxygen) when a sudden transition takes place from a deflagration type of combustion to a detonation type of explosion.
What does deflagration mean in English?
Deflagration is an explosion in which the speed of burning is lower than the speed of sound in the surroundings. A detonation generates greater pressures and is more destructive than a deflagration. A deflagration is a fire in which a flame travels rapidly, but at subsonic speed, through a gas.
What is deflagration flame arrester?
In short, the deflagration Flame Arrester is designed to stop the initial phase of the explosion and is shorter and lighter than the unstable detonation arrestor, but the Deflagration Flame Arrester has restrictions on its placement within the pipework regarding distance from the source of ignition.
What is the difference between deflagration and detonation quizlet?
What is the difference between deflagration and detonation? Deflagration is characterized by very rapid oxidation that produces heat, light, and a subsonic pressure wave. Detonation is characterized by extremely rapid oxidation that produces a supersonic shockwave.
What is a deflagrating explosive?
3.2 Deflagration and Detonation. Explosives are those substances that have their own supply of oxygen in their molecules. When they are initiated, they may either burn violently (deflagrate) or explode disastrously generating shock waves (detonate).
How is deflagration used to mitigate an explosion?
Deflagration venting is used to minimize structural or mechanical damage in the event of a deflagration by venting combustion gases and pressures to a safe location outside of the enclosure. Explosion vents, also referred to as explosion panels or explosion relief panels, provide a passive and cost-effective means of explosion mitigation strategy.
What do you need to know about deflagration venting?
Deflagration venting is an explosion protection measure that involves the provision of a predesigned escape route (called an explosion vent) for the release of the pressure and flame generated during an explosion quickly enough to prevent a dangerous build up of pressure within the vessel, pipes and ducts, or building that is being protected.
Which is the most important characteristic of deflagration?
The most important characteristic of deflagration is that the rate of deflagration (or the rate of recession of a burning surface, often expressed in millimeters per second at a given pressure) is much below the sonic velocity of the material (i.e., the velocity of sound through the propellant material). 5.
How is the process of deflagration sustained by thermal feedback?
The process of deflagration is sustained by thermal feedback from the flame to the surface temperature by means of conduction, convection, and radiation. 6. The rate of regression (or burning rate]