pre combustion chamber
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- Опубликовано: 26 фев 2014
- An indirect injection diesel engine delivers fuel into a chamber off thecombustion chamber, called a prechamber, where combustion begins and then spreads into the maincombustion chamber. The prechamber is carefully designed to ensure adequate mixing of the atomized fuel with the compression-heated air.
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Let me tell you something.... Combusting makes me feel goood!
Who you gonna call?
_Combusters!_
When I call Combusters, the call gets redirected to your mom for some reason.
Nowadays majority of diesel engines are direct injection as its more efficient than indirect injection
a slightly similar design also makes gas engines a lot more efficient impressive how old the idea is
thanks well explained
Beautiful description 👌
Soviet GAZ-24 Volga also used forechamber ignition to conserve fuel. Except it was a gasoline engine.
well explained. thnk u.
Are diesel engines these days using precombustion chambers? Golly I didn't even know this was a thing until just now.
great
The pre combustion chamber was use in the GM V6 and V8 of the 1970's and 80's
No it wasn't. They were direct injection. Caterpillar was the main proponent of precombustion chambers.
@@dsdave07 I thought that the head has an area raised where the glow plug entered the chamber. A round disk was flush with the head to disturb the injector stream and keep the glow plug heat confined for easier starting.
@@dsdave07 CUCV
Nicely explained
Thanks
thnku
but this creates a high temperatures in the pre combination chamber because of its small size how it can withstand that pressure and temperature & more over whether it increases efficiency or reduces pollution
Yes yet it is smaller as the fuel gets ignited in the pre combustion chamber, with no time it rushes into the main combustion chamber creating swirling action that leads air n fuel particles into homogeneous mixture. Fuel burns completely n there by fuel efficiency n more power output achieved. This is what I know.
Probably because the mixture within the precombustion chamber is so rich relative to the main cylinder volume, the fuel rich condition lowers temperature considerably
because of its small size? bursting pressures of cylinders increases as diameter reduces...
hotter is better. promotes combustion. its a diesel. no fear of pre-ignition or detonation.
if its cast iron, it isnt going to have an issue and even alloy is happily kept within limits.
the pressure is the same everywhere in the chamber. within limits of the speed of sound, propagation rates. what acts on the piston acts on the head and on the inside of the chamber.
(people have this idea that the "flame" is doing the work. no. thats just the combustion process, incandescence. its the heat released during that reaction that creates a rise in pressure. that can travel far faster than the "flame" ever can. blue flames out the exhaust isnt lost push, other than the fact that blue flame is very hot and so the gas leaving is also very hot. it hasnt expanded as much as it could. so it makes a really loud noise as its released... the loud exhaust noise is the waste of energy. not the flame!)
anyway, the precombustion chamber... it suffers from the issue that its unswept volume, very hard to clear of exhaust byproducts. and upon compression, there will always be some compressed gas left in the clearance space rather than in the chamber... a diesel generally always runs extremely lean, as it is the heat that ignites the fuel, but as it is confined within the chamber without the full charge of air, along with residual exhaust gas, it isnt quite as good as the initial theory suggests?
the piston bowl has the same issue. its unswept volume, can never fully clear it, and it affects flame propagation as the piston descends..
but its necessary as to try and compress all that air into a simple combustion chamber makes it far to thin, surface area to volume ratio means most of the heat of compression is lost to the head and piston crown rather than retained in the air where its needed. along with the swirl induced by a small combustion chamber or bowl. "squish"..
it actually has me thinking of a totally different way of doing things now... hmmmm....
but most pre combustion chamber designs have one good thing.
it's that when the combustion happens, it's gonna run lean in that chamber, so the fuel mixture is gonna escape to main chamber. but it does it rapidly cause the chamber mouth is narrow. so this should give you more power on high revs cause you'll have fire running towards the piston at rapid speed rather than fire trying to catch the piston in the non precombustion chamber design.
Mercedes AMG use this tecnology for their f 1 car..
every F1 engine not only Merc
The Last example is indirect inyection?
yes
⚡️
pre combustion is old and inefficient design. It creates high NOx and PM, it also is poor fuel efficient. It was designed because there were no sufficient high pressure injectors awailable at that time.
Poor fuel efficiency? Tell that to the guys getting mid 20s mpg out of old Chevy 6.2 and 6.5 IDIs in full size trucks.
Nope.
@@justinstearns9723 Lol, I get over 40mpg in vw 1,9 td indirect injection engine in a 27 year old car.
@@justinstearns9723 yeah just open the exhaust and run a taller rear gear. If you really wanna be fancy, ZF5 swap.
@@justinstearns9723 Tell that to the engineers who would love to design a modern direct injection diesel with no DPF or DEF restrictions.
Mixture? In a Diesel engine? Tike anothah look, mite.
Which use of "mixture" did you think was incorrect?
Diesel engines burn a mixture of fuel and air. Why wouldn't "mixture" be used when describing the fuel injection system?
@@ddegn No they don't. The fuel never mixes with the air. The injectors spray fire.
@@dsdave07 Diesel needs oxygen to burn. The oxygen comes from the air.
Diesel isn't like gunpowder which contains its own oxidizer. Diesel needs an oxidizer to burn.
Diesel doesn't need a spark but it needs air.
@@ddegn You're right, but there's never a mixture. The oxygen is in the compressed air in the cylinder, then the fuel is injected into the air, not a mixture - ever!
@@dsdave07 I understand you point better now. Thanks.
Still even though the diesel and air don't mix before entering the combustion chamber, they still have to mix in order to burn. Is there a better term they should use to describe how the fuel interacts with the compress air?