What causes 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. The combustion wave travels at subsonic speeds to unburned gas immediately ahead of the flame front.
What is the difference between deflagration and explosion?
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).
What is explosive pressure?
Maximum explosion pressure (pmax, MPa) is the maximum pressure, emergent by explosion of airborne powder in a closed vessel with initial pressure 101.325 kPa.
What is deflagration example?
A deflagration to detonation transition has been a feature of several major industrial accidents: 1970 Propane vapour cloud explosion in Port Hudson. Flixborough disaster. Phillips disaster of 1989 in Pasadena, Texas.
How does deflagration detonation work?
Deflagration-to-detonation transition is the general process by which a subsonic combustion wave (deflagration or flame) becomes a supersonic combustion wave (detonation).
What is pressure deflagration limit?
This paper deals with the low pressure deflagration limit (LPDL), which is the minimum pressure below which burning of a propellant ceases without the assistance of an external energy source.
What is hydrogen deflagration?
Cell size is the parameter that characterises the detonation sensitivity of a hydrogen-air mixture [2]. Deflagration is the phenomenon of combustion zone propagation at the velocity lower than the speed of sound (sub-sonic) into a fresh, unburned mixture [1].
What is deflagration flame arrester?
A flame arrester (also spelled arrestor), deflagration arrester, or flame trap is a device that stops fuel combustion by extinguishing the flame.
What is a deflagration hazard?
Deflagration is a term often used to describe combustible dust explosions. A deflagration is an “ordinary” fire such as a gas stove, burning wood or paper, and even the burning of gasoline vapour inside the cylinder of an automobile.
What does a shockwave do to your body?
Shockwave is an acoustic wave which carries high energy to painful spots and myoskeletal tissues with subacute, subchronic and chronic conditions. The energy promotes regeneration and reparative processes of the bones, tendons and other soft tissues.
What is deflagration and detonation how it is different than Bleve?
The difference between a deflagration and detonation is the mechanism whereby energy required to activate the explosive reaction is transferred from reacted to unreacted material. In a deflagation, the mechanism for propagation of the explosion reaction into the unburned material is by heat and mass transfer.