[modeleng] Re: Smokebox Innards
- From: "alanjstepney" <alan@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx>
- To: <modeleng@xxxxxxxxxxxxx>
- Date: Fri, 12 Nov 2004 17:30:15 -0000
Phil, I think I have the same problem.
re-reading the last sentence of my email, it looks as if I am invoking
assistance form an unusual quarter!
Alan
----- Original Message -----
From: "Phill Smith" <steam@xxxxxxxxxxxxxx>
To: <modeleng@xxxxxxxxxxxxx>
Sent: Friday, November 12, 2004 4:27 PM
Subject: [modeleng] Re: Smokebox Innards
Sorry mate.
For some completely stupid reason, unexplainable, I didn't read you whole
email.
Can I blame tiredness?????
Cheers,
Phill.
----- Original Message -----
From: "alanjstepney" <alan@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx>
To: <modeleng@xxxxxxxxxxxxx>
Sent: Friday, November 12, 2004 11:58 PM
Subject: [modeleng] Re: Smokebox Innards
> Phil,
> I DO have a copy.
> However, it is old information and even Steels re-write didn't update much
> of it.
>
> The work that Clif mentioned by the GWR, was by Sam Ell, and was based
upon
> work by Prof Goss of Pardua University.
> That resulted in many improvements to UK loco's, and also showed that the
> one big problem was that our loading gauge was too small, thus restricting
> the area of chimney to below the ideal size. The answer as, of course,
dual
> or multiple chimneys-blastpipes.
>
> Since GWR times others have also worked on draughting, including Port, and
> Wardale and, Jos Koopmans, among many others.
> Prof Bill Hall did some work on it, and showed that provided the area of
the
> entry to the petticoat pipe is twice that of the chimney, a straight
chimney
> only loses some 15% of efficiency compared to a properly constructed
> venturi. The entry acts as the convergent part, thus increasing the gas
> velocity, and creating a partial vacuum..
> Of course, 15% can make the difference between a good and a mediocre
> performance.
>
> Rather than calculate the size of the blast pipe orifice it is probably
> easier to sue the software he designed and try out different sizes, whilst
> checking the vacuum produced.
>
> As you say, the 1:3 and 1:6 angels are important, and I did mention this
on
> my previous email.
>
> alan@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
>
> www.alanstepney.info
> Model Engineering, Steam Engine, and Railway technical pages.
>
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