Exhaust Modifications for #17

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Exhaust Modifications for #17

Post by Low_Water_Odom on Wed Jun 19, 2013 8:04 am

Let's start with a drawing of #17's as-built exhaust arrangement (all dimensions are in inches):


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17 other interesting specs.

Post by DaveLathrop57 on Wed Jun 19, 2013 9:13 am

OK, I'm looking at the Form 4 among other things.....

basics: 14X22, 37" drivers, 195 PSI - we run about 190.

16.3 square feet grate area. 60 firebox. 19.3 flue sheets. 656.4 tubes. total 735.7.

Estimated steam generating capacity 10, 299 Lbs/hr.

15 MPH track speed on the railroad. I'd use 12 as a general average for free running between restricted sections at either end.

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Re: Exhaust Modifications for #17

Post by Michael Guy on Wed Jun 19, 2013 12:09 pm

Using that 10,300 mass flow I get a 12 inch mixing chamber and four nozzles at 1.9" diameter. Predicted vacuum is 12 inches of water. This assumes a diffuser of Cp .65 and in/out ratio of 1:2.5. Nothing cast in stone about this, just a first look.

Michael.

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Re: Exhaust Modifications for #17

Post by DaveLathrop57 on Wed Jun 19, 2013 12:24 pm

Thanks Michael. Now if we can just move all the 17 posts and divert the replies from the other thread to this one......It's going to get confusing otherwise.

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Re: Exhaust Modifications for #17

Post by JJG Koopmans on Wed Jun 19, 2013 6:33 pm

Michael,
The numbers should be slightly different. The steam for the oil burner cannot be used as exhaust steam and is part of the products to be expelled.
Kind regards
Jos

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Re: Exhaust Modifications for #17

Post by Michael Guy on Wed Jun 19, 2013 7:05 pm

This is true. Good point.

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Re: Exhaust Modifications for #17

Post by DaveLathrop57 on Wed Jun 19, 2013 7:32 pm

And, we run a dynamo and an air compressor......and we don't run wide open with 100% cutoff.

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Re: Exhaust Modifications for #17

Post by Michael Guy on Wed Jun 19, 2013 7:44 pm

Actually I used 85% bp and 60% cut off on that one. Just didn't mention it. Smile

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Re: Exhaust Modifications for #17

Post by Michael Guy on Wed Jun 19, 2013 7:54 pm

Ignore that last post it isn't true. Still at work trying to do too many things at once.

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Re: Exhaust Modifications for #17

Post by DaveLathrop57 on Wed Jun 19, 2013 10:29 pm

Let this ride......plenty of time to give it some uninterrupted thought later on.

If this works out well, it would be very useful to do electronic digital versions of indicator cards so we can really see what's going on.

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Re: Exhaust Modifications for #17

Post by Michael Guy on Wed Jun 19, 2013 10:42 pm

The potential for some real testing and proper data logging is really interesting. I attempted a series of nozzle tests last year with a steam tractor but the results were inconclusive. The thing was perfectly happy with little or no forced draft at all.

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Re: Exhaust Modifications for #17

Post by Michael Guy on Wed Jun 19, 2013 11:49 pm

I just noticed that #17 seems very similar to Flagg Coal #75. The builders cards are almost identical. Do you guys know what the front end looks like on the 75?

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Re: Exhaust Modifications for #17

Post by JJG Koopmans on Thu Jun 20, 2013 8:00 am

What is the dimension of the orifice of #17. The 3 1/4 in. from the drawing gives weird results in my spreadsheet.
Kind regards
Jos

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Re: Exhaust Modifications for #17

Post by DaveLathrop57 on Thu Jun 20, 2013 9:02 am

It has been opened up to somewhere in the 4" range....or a bit larger. I can't exactly recall off the top of my head. I had it when I worked out the Lima style arrangement for it, will see if I can track down the notes.

Dave

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Re: Exhaust Modifications for #17

Post by JJG Koopmans on Thu Jun 20, 2013 9:20 am

Dave, thanks!
A 4 in. orifice is far more likely!
Kind regards
Jos

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