Project of the Month built by sbdtasos
Home Model Engine Machinist > Building Them > Plans > Simple Steam Turbine Plans

Reply
 
Thread Tools
Old 02-16-2017, 05:19 AM   #11
Blogwitch
Ex Bogstandard
HMEM_SUPPORTER.png
 
Blogwitch's Avatar
 
Join Date: Dec 2008
Location: Crewe, UK
Posts: 3,406
Liked 600 Times on 452 Posts
Likes Given: 52

Default

Thanks Al for the confirmation.
The problems started when Google took over and automatically raised a new account linked to Gmail and everything else under the sun. So I couldn't access my old account with all my vids on it. I have managed to get to them now, but can't add any new vids, only to this crappy new account, which I hope now is set up for showing vids.

Jens,

I see you have hit the steam everywhere barrier usually associated with the open faced turbines, imagine that in an enclosed hull, it is like emptying your boiler directly into the hull, it would be water swamped in no time.
That is why on my second unit (3 rotor) I put a collection chamber on it to send any exhaust overboard.
The vid show it running on air, but it has run on steam, and the collector worked very well indeed, but my 3.5" diameter gas fired boiler just couldn't keep up with it's requirements, I had to keep stopping to allow the pressure to build up again.

John


__________________
If you don't try it, you will never know if you can do it!!
Blogwitch is online now  
 
Reply With Quote
Old 02-16-2017, 07:16 AM   #12
bazmak
BAZMAK
 
Join Date: Dec 2012
Location: adelaide south australia
Posts: 1,507
Liked 748 Times on 435 Posts
Likes Given: 618

Default

Hi John,i put on Utube a series of images of steam locomotives
and while playing about added a few pieces of my favorite music
Further down the line they put a stop to my slide show due to
copyright infringement.The problem was not the images but one of the tunes
was not allowed.Guess where I downloaded it from.You guessed it.The Utube
free download software. Go Figure.# out of 4 of my uploads are ok but one is
forbidden in UK, etc but not in the rest of the world.Look up Gresley pacifics


bazmak is offline  
 
Reply With Quote
Old 02-16-2017, 07:36 AM   #13
modeng2000
 
Join Date: Nov 2008
Posts: 102
Liked 5 Times on 5 Posts
Likes Given: 27

Default

All good now John, thanks.
modeng2000 is offline  
 
Reply With Quote
Old 02-16-2017, 08:14 PM   #14
Mechanicboy
 
Mechanicboy's Avatar
 
Join Date: Jul 2013
Location: Bergen in Norway
Posts: 378
Liked 141 Times on 108 Posts
Likes Given: 174

Default

Quote:
Originally Posted by Blogwitch View Post
Jens,

I see you have hit the steam everywhere barrier usually associated with the open faced turbines, imagine that in an enclosed hull, it is like emptying your boiler directly into the hull, it would be water swamped in no time.
That is why on my second unit (3 rotor) I put a collection chamber on it to send any exhaust overboard.


John
John, this was a test running the turbine hence i had not completed the steamturbine with the cover + exhaust pipe to lead steam out of the boat.


John wrote: The vid show it running on air, but it has run on steam, and the collector worked very well indeed, but my 3.5" diameter gas fired boiler just couldn't keep up with it's requirements, I had to keep stopping to allow the pressure to build up again.

---> Replace with a smaller orifice (steam jet) to prevent loss of pressure in the steam boiler and keep steam turbine running. As rule the steam turbine need a big heat of surface in the boiler or use flash boiler.

My own experience: Do not use too large turbine diameter as it requires higher vapor pressure and greater consumption. With a turbine diameter 30-35 mm will provide higher speed than a large turbine diameter. The turbine should act as flywheels as being high torque. The turbine wheel should have more turbine blades to keep steady power from the steam jet. Use ball bearings to keep the friction low as possible. Oil viscosity is critical in relation to the vapor pressure vs. speed.

I took the test with difference oils in the bearings.

Here are the tests of oils and measured revolutions per minute:
Work pressure= Mobil ESP 5W-30 / Air tool oil / Diesel oil (fuel for diesel engine as lubricant)

1 bar= 4700 / 13230 / 17600
1.5 bar= 6200 / 17900 / 25700
2 bar= 11400 / 21660 / 31500
2.5 bar= 15500/26340 / 36700
3 bar= 18600 / 28800 / 41800

As i can see the ball bearing get less friction with diesel oil as lucricant, it is sensitive for jet stream from nozzle. With high revolution above 15000, i can feel there are enough torque when trying to stop the turbine shaft.
Attached Thumbnails
Turbin.jpg  
__________________
Jens Eirik, Bergen in Norway :)
Mechanicboy is offline  
2
People Like This 
Reply With Quote
Old 02-17-2017, 11:47 AM   #15
Blogwitch
Ex Bogstandard
HMEM_SUPPORTER.png
 
Blogwitch's Avatar
 
Join Date: Dec 2008
Location: Crewe, UK
Posts: 3,406
Liked 600 Times on 452 Posts
Likes Given: 52

Default

Jens,
Sorry I jumped in too soon in your production of a turbine, I thought it was one of those bought units that are for display only.

With regards to your comments, I can't really go much smaller as the steam jet nozzles only has a 1mm hole through it at it's smallest point. I know the problem, my boiler just isn't big enough for this engine.

Here it is running on a good head of air, about 40 psi, well before completion, on just one nozzle, so I know the nozzles I made were OK.


I informed the chap who this prototype was being trialed for (he would be getting just a pair of two rotor ones) that he would require a flash steam boiler to run both, but he wouldn't go down that route, so his project was abandoned.

You mentioned the rotor diameter, the rotor in this one is about what you stated.

With regards to your build if I could make a suggestion. Get rid of the pressure as soon as possible after it has done it's job. I made two tangential exhaust holes for each rotor face. One about opposite from the pressure nozzle and a second at about 45 degrees after TDC. This scavenges most of the spent air/steam before it has time to get around the rotor and starts to interfere with what is being fed in.
You can just see the four holes for the fwds rotor and the two holes for the rev rotor, all are tangential to the rotor itself to 'scrape' the air /steam from it's surface and get rid of it before it goes too far.




John
__________________
If you don't try it, you will never know if you can do it!!

Last edited by Blogwitch; 02-17-2017 at 02:31 PM.
Blogwitch is online now  
 
Reply With Quote
Old 02-18-2017, 07:02 AM   #16
Mechanicboy
 
Mechanicboy's Avatar
 
Join Date: Jul 2013
Location: Bergen in Norway
Posts: 378
Liked 141 Times on 108 Posts
Likes Given: 174

Default

See at drawings who i has changed some points.. Use steel shaft instead brass shaft to rotor and mount ball bearings in rotorhouse to preventing the rotor is moving sideways. Ball bearings light press in the rotorhouse and shaft snug fit in ball bearing.
Attached Thumbnails
Rotor.jpg   Dyse.jpg  
__________________
Jens Eirik, Bergen in Norway :)
Mechanicboy is offline  
 
Reply With Quote
Old 05-14-2017, 06:42 AM   #17
Bronzewing
 
Join Date: Dec 2011
Posts: 3
Likes Given: 1

Default

Hi
Just a point about Youtube. There is an option to view your channel as others see it. It can help to see how changes you make on settings actually work.


Bronzewing is offline  
 
Reply With Quote
Reply


Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Wren Free Turbine Plans Kawka777 Plans 22 05-08-2015 03:04 PM
Beginner Steam Engine and Steam Turbine plans - No machine tools required moya034 Plans 4 10-28-2014 11:14 AM
Turbine Steam Car prallplatte A Work In Progress 29 11-01-2013 09:26 PM
Solar Thermal Steam-Powered Turbine iansdodge General Engine Discussion 6 06-11-2008 11:39 PM
Prototype three rotor steam impulse turbine Bogstandard A Work In Progress 115 04-13-2008 10:06 AM



Newest Threads






- Top - Member List