Thermal engine efficiency according to fuel

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iridium
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I understand econologic
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Registration: 14/10/08, 11:12

Thermal engine efficiency according to fuel




by iridium » 12/03/10, 12:02

Hi all.

An idea just came to my mind.
in the context of an internal combustion engine we always strive to obtain the most compressed mixture possible.
in order to extract maximum yield from it during the explosion.
According to fuels, the volumetric ratio varies enormously.
diesel takes a long time to catch fire the effective average pressure will be more and more limited as the cycles will unfold in an increasingly short time.
self-ignition followed by pilot ignition destroys the combustion chambers.
the fuel being bcp more volatile.
the volumetric ratio is therefore limited on spark-ignition engines.
however the yield decreases accordingly.

I simply thought of an engine whose volumetric ratio could for example go up to 20: 1.
if the fuel ignites at a ratio of 8: 1 the engine should be able to modify its geometry in order to allow it to operate with a volumetric ratio of 8: 1.

in addition to the fact that this makes it possible to optimize the yield according to the fuel used, it also makes it possible to burn any fuel.

one can imagine at first a villebrquin mounted on a spring.
this image just to give an image of this idea.
I post this in case someone else is interested in the idea.
For my part, I am not interested in designing an engine of this type.

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Flytox
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by Flytox » 12/03/10, 21:27

Hello Iridium

The concept of variable compression ratio is very good but is not really new. It is apparently more difficult than it seems to realize. For the moment no one has produced this engine in large series, among others, for problems of prohibitive price and reliability, especially since it should be able to show a real depreciable gain apart from advertising papers ...: Mrgreen:

http://automobile.challenges.fr/dossier ... le_p1.html
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kistinie
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by kistinie » 25/05/10, 08:17

The simplest is to have a fixed compression Tx and to vary the fuels for the start-up phase.

As on the McCormick-Deering 15 \ 30 of 1927.

This is also the principle of industrial marine diesels whose performance is one of the best today.

Petrol or cold gas, then heavy fuel oil or kerosene, then emulsion water or Pentone

https://www.econologie.com/forums/tracteur-m ... t6552.html
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oiseautempete
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by oiseautempete » 25/05/10, 09:43

kistinie wrote:The simplest is to have a fixed compression Tx and to vary the fuels for the start-up phase.

As on the McCormick-Deering 15 \ 30 of 1927.

This is also the principle of industrial marine diesels whose performance is one of the best today.

Petrol or cold gas, then heavy fuel oil or kerosene, then emulsion water or Pentone

https://www.econologie.com/forums/tracteur-m ... t6552.html


Are you kidding, I hope? : Lol: : Lol: : Lol:

The variable compression engine exists and it is in full development: MCE-5, and it is in France that it happens, PSA is very interested ...
http://www.mce-5.com/
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kistinie
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by kistinie » 25/05/10, 12:45

non
I am very serious
A fixed speed engine, therefore for hybrid, multi-fuel, seems to me a much better compromise, more reliable, cheaper, simpler.

But hey, go for the gas plant of the variable volumetric ratio which effectively, is essential when using candles and a variable speed ... For fans of the vroum vroum! ;-))

In this case of a diesel, it is useless because a diesel knows how to burn as secondary energy, gasoline or gas and in passing, its yield goes up again.
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