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A reciprocating piston: Bursts of exploding fuel push a piston up. A crank converts this into rotating motion.
The fuel air mixture is burning rather than exploding. An explosion would only damage the engine without producing any power.
Quote from: Geezer on 20/06/2012 17:21:48The fuel air mixture is burning rather than exploding. An explosion would only damage the engine without producing any power.That is debatable.I would argue that Diesel engines (ie. compression ignition engines) operate in an explosive manner, since the pressure wave is supersonic.Our friend Wikipedia says:"Explosions are categorized as deflagrations if the pressure waves are subsonic and detonation if they are supersonic. When a detonation happens, the supersonic pressure waves are named shock waves."
Yes, which is why hydrogen is a rubish fuel in ic engines (the flame front is too quick so work is wasted)
Burning, exploding, it is just the rate of flame front propagation. Gunpowder burns fast, and if it is confined the pressure evolved by the hot gas is vety high. C4 burns a few magnitudes faster, the flame front speed can be measured in kilometers per second, as opposed to the meters per second of gunpowder.