What is detonation and what causes it?
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What is detonation and what causes it?
Answer: Detonation, or engine knock, occurs simply when fuel pre-ignites before the piston reaches scheduled spark ignition. Detonation is generally caused by excessive heat, excessive cylinder pressure, improper ignition timing, inadequate fuel octane or a combination of these.
What is detonation in a car?
Detonation is spontaneous combustion inside the cylinder AFTER the spark plug fires. It is similar to Pre-Ignition, but it is different. During normal ignition, the spark plug fires just before the piston reaches TDC. Detonation is also called an “Engine Knock”, “Knocking”, or “Pinging” because of the sound it makes.
What is detonation in gas engine?
Detonation—sometimes called knock or pre-ignition—is a pinging sound that can sometimes be heard during acceleration and throttle tip-in. Unlike normal exhaust noise, detonation is a higher-pitched, raspy note that emanates from the engine compartment.
Is detonation an explosion?
Discovered in 1881 by French scientists, detonation is the result of a supersonic wave initiating a secondary explosion. Explosion, on the other hand, is a general term for an accelerated release of energy generating extreme temperatures, releasing of gases and expanding volume.
What is effect of detonation?
when detonation occurs, the fuel charge ignites quickly in an uncontrolled explosion, causing a pounding or hammering force on the piston rather than a steady push. Moderate to severe detonation could be noticed as engine roughness, vibration or loss of power and eventually engine damage.
Can Oil cause detonation?
Re: Detonation due to Oil Consumption? Yep, oil will cause detonation.
What is detonation in engine aviation?
Detonation – Detonation, as the name suggests, is an explosion of the fuel-air mixture inside the cylinder. It occurs after the compression stroke near or after top dead center. During detonation, the fuel/air charge (or pockets within the charge) explodes rather than burning smoothly.
What is detonation in fire?
A detonation occurs when the flame velocity reaches supersonic speeds above 600 m/s and generally in the 2000-2500 m/s range. Peak overpressures can be 20–100 times the initial pressure, with typical values of 20 bar.
What is the difference between explosion and detonation?
Detonation is a type of explosion. Both detonation and explosion occur when the volume increases rapidly and there is high release of energy. Detonation is more intense as it produces supersonic shock waves whereas explosion has less intensity and produces low intensity shock waves.
What exactly does detonation hurt in an engine?
Mechanical damage (broken ring lands)
What does detonating mean?
Detonā′tion, an explosion with report; Det′onator, a detonating substance: an apparatus for the explosion of a detonating substance, as a percussion-cap.—Detonating powder, powder, such as the fulminates, which explodes easily by impact or heating, and which may be used to cause other substances to explode.
Is detonation caused by low octane fuel?
Detonation – generally caused by fuel with a low octane rating – is the tendency for the fuel to pre-ignite or auto-ignite in an engine’s combustion chamber.