[modeleng] Re: Injectors
- From: "Phill Smith" <steam@xxxxxxxxxxxxxx>
- To: <modeleng@xxxxxxxxxxxxx>
- Date: Mon, 21 Mar 2005 00:49:38 +0800
That's not actually all that is going on.
Some air is carried into the boiler with the water, but air is also being
discharged from the water due the the elevation in tempurature of the water.
All water that has been exposed to a gas, absorbs that gas until the partial
pressure of the disolved gas reaches equilibrium. These partial presures are
dictated by the absolute pressure durring absorbsion, and the tempurature of
the water. As the tempurature of the water is raised, the partial pressure
is reduced, and hence the gas is released. In an injector, the only time
that the gas can escape is as the water jumps the gap between the combining
cone and the delivery cone, so it is released then.
The question is, which one is greater? The air going in, or the air coming
out? The easiest test, is to have it running dry (singing as Jesse put it),
and to put a soap bubble across the overflow pipe. If it blows out, then the
air being released is greater than the air being drawn in. But if it goes
in, then it is sucking more than is being released. As injectors should run
at approximately 70 - 75°C, this is well past the partial pressure release
tempurature for water, so there will be some gas released. You can use "glad
wrap" if you wish, and check for the dirrection of the dishing.
I already know what is happening with the injectors that I make, but what
will you learn if I told you all the answers to mine? As I only supply to
Australian retailers, it is unlikely that you will have one of mine on your
engine. Every design of injector gives slightly different results, and that
is not just in performance. I sugest that you all give it a try, and see
what results you get. <GRIN> I'll be interested to learn what the results
are.
Cheers,
Phill.
----- Original Message -----
From: "Pendragon" <idpriest@xxxxxxxxxxxxxxxx>
To: <modeleng@xxxxxxxxxxxxx>
Sent: Sunday, March 20, 2005 4:30 PM
Subject: [modeleng] Re: Injectors
>
> Jessie,
> Not sure I agree with you when you say that injectors working correctly
> 'sing' as this indicates that air is being sucked in the overflow and =
> pumped
> into the boiler at the same time as water. I believe that when working =
> at
> its optimum there should be the slightest trace, just a bubble of water
> issuing from the overflow.
>
> Regards IP
>
> Priest & Sons Model Engineers
> http://www.kinvermes.pwp.blueyonder.co.uk/p1.htm
>
>
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