A good way of understanding diesel ignition in an engine?
Or detonation from octane rating to low or too much compression in a gasoline engine.
Is that actual detonation when an engine knocks?
[Edited on 2-7-2017 by curiosity_cat]Dornier 335A - 3-7-2017 at 03:38
It's not an actual detonation. A true detonation would blow the cylinder into pieces.PHILOU Zrealone - 3-7-2017 at 04:33
Not a good way to understand detonation...but part of the shock-wave theory ...itself part of the detonation-wave theory.
In front of a shock wave into a tube generated by a difference of pressure (even if moderate like 20) you soon reaches several-fold sonic shockwave
(supersonic) propagation and quite high temperature (>1200°C that allow for glowing gases even if non combustible like N2, Ar, He, H2, O2, CH4,
Ne, Cl2, F2...or non exploding mixes thereof).
The compression heats up the gases and increases their density...thus the shockwave travels even faster into gaseous media; if the gaseous mix is
combustible...the compression wave may ignite it and propagates it further...via deflagration and if wel mixed and into the explosibility %
zone...then even to detonation...
