Diesel Engines & Fuel Detonations

Detonation releases energy from fuel about 1000 times faster than combustion, because it is reaction occurring within the whole volume containing reaction at the same time, which releases energy fast and that generates about 14 times higher pressure and temperature, which destroys engine. This pressure usually causes:

1. bending of the piston rod or;
2. caving of piston crown;
3. bearing breaking;

and this high temperature just melts piston crown that is the worst cooled part of every engine and that is why only gun-engine can run on hydrogen that is very explosive.

diesel engines work by detonation hence the distinctive noise

what exactly are you on about ?

peterg7lyq not logged in

it is actually poor injection that creates the rattle you hear, small drops of poorly atomized fuel heat up and combust suddenly in a clack, proper atomized fuel will create a smooth flame that has little noise, just smooth increase in pressure that is forcing the pistons downward, engineering dream but not a reality.

What you suggest doesn't make much sense....

if fuel is poorly atomized consisting of small drops, then it will not all be well mixed with oxygen.... this will lead not to more rapid combustion, but slower burning as it will take time for portions of the fuel to come in contact and be oxidized by the oxygen. ....

Likewise, when fuel and oxidixer are well mixed and in intimate contact in stoikiometric ratios a smooth quiet flame is a very poor prediction/description of the detonation that will occur. Detonations from well mixed fuel and oxidixer are characterized by very sharp increases in pressure (not quiet) due to the reaction of a substantial portion of the fuel oxidizer within a very short period of time (not a smooth flame)...

Were you really an engineer for a French auto maker? If so, in what capacity?

I have never owned a French car, so i do not know anything about the quality/design/reliability other than the moans and curses i have overheard errupting from the unfortunate owners.

Perhaps it is similar to going to war, for which French participation is indispensable . If so, perhaps the popular words of wisdom could be modified and expanded to say......

''You can't go to war, 'nor can you engineer a car', without the French! That would be like going deer hunting without an accordian!''

Bbb ftmre