Admission temperature

[Flytox]

Bonjour à tous

We inject steam into the intake manifold, which is a certain length before reaching the valve.

Has anyone ever measured the temperature near the intake valve with and without steam under equivalent circumstances?

Is there a significant condensation of water on the walls forming a parietal film? For having made a transparent intake pipe on a 2-stroke engine, we see ... runoff of petrol behind the 19 mm DelLorto carburetor!

Clearly, do the transformations of the steam along the length of the intake manifold result in the formation of a "certain" quantity of "large" drops which stick to the wall and flow directly into the cylinder?
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[Other]

Hello

This explains the poor lean mixtures, while the tubing is not hot, the condensed absence is not effective in the mixture.
the tubing in an engine is not a simple pipe, it is something complex as much on its shape as its internal roughness as well as the arrangement of its last elbow before reaching the threshold of valves
it is because some engines work well with a turbulator and others not at all

on a carburetor engine the tubing is generally short and warmed up either with the LDR or exhaust.
Too much heating that hurts filling (problem almost solved with multipoint injection)
Certain flat WV 2cv engine the manifold is long certain poses two carburetors Rotax 912 engine.

In our carburetor or water injection pant assembly it is even more delicate than with petrol, water tends to gather in large drops, hence the spraying fairly close to the reactor and having a certain velocity of air temperatures should be higher

Andre

[Flytox]

Hello André

You who have tried a mountain of things, haven't you tried an anti-wetting silicone coating for example to prevent the accumulation of water on the walls. I have not found any for aluminum capable of withstanding hot water.

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[Other]

Hello

Hello André

You who have tried a mountain of things, haven't you tried an anti-wetting silicone coating for example to prevent the accumulation of water on the walls. I have not found any for aluminum capable of withstanding hot water.

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It is better to attack the problem at the source, than to try to correct it further, (never tried)
if our engine manufacturers attacked the engine more we would not need catalyst and dust filter.

Andre

[Flytox]

Bonjour à tous

https://www.econologie.com/fichiers/partager/hydrof.bmp

I would need a product, paint, coating etc ... which gives a hydrophobic surface like that of the photo for the interior of the intake manifold. Everyone I have found is for building and porous surfaces not aluminum.

The temperature of the intake duct does not exceed 40 - 45 ° in operation (for ambient t ° of 20 ° and without steam) and at 20 - 25 cm from the valve, it is more than enough for condense a maximum of water on the walls.

It seems to me that if the micro water droplets "run" on the wall instead of clinging / agglomerating in a water film, the results will be more constant and less dependent on the temperature of the intake duct.

There is also the film of water which moves much more slowly than the gases to reach the cylinder and which creates a kind of delay effect in the parameters.

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[Other]

Hello

It seems to me that if the micro water droplets "run" on the wall instead of clinging / agglomerating in a film of water, the results will be more constant and less dependent on the temperature of the intake duct.

.

There is a lubrication principle for ball bearings of heavy equipment Oil mist, sends hot oil in coarse mist and low air pressure, the duct must be small in diameter and have a minimum length. It comes out at the end of this pipe an oil mist that looks like a nebulizer
at the beginning in this conduit, it is wetted by oil, the passage of air stretches the film of oil which finished after 1 meter has nebulized, the conduits which brings this mist are sometimes more than 40 meters long, they must be hot ..

With water I don't know the length and diameter parameters.

In my case the temperature at the inlet of the reactor is rather low often at 35c that at the outlet always above 100c most often at 130c so no condensation in the duct then it is routed in the turbo, the strongly brewed and heated (not if it becomes a droplet in front of the turbo, the aluminum turbine will not last long

Andre

[Flytox]

Bonjour à tous

When man begins to imitate nature:

http://www.techno-science.net/forum/viewsujet.php?t=909

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