triple expansion engine
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@dorkzism You mean single cylinder? At the end of the stroke there is still useful pressure in the steam which goes to waste hence the loud chuff of a loco starting off.. Put it in another cylinder to get extract more work. lower pressure x bigger diameter = same effort.
Marine engines in particular can pull the pressure at the end down to nothing by creating a vacuum in the condenser the steam exhausts into.
The alternative would be a longer stroke which means a much bigger crank
spentacle 1 month ago
@spentacle thank you common sense good post my friend
purpherder 1 month ago
what advantage does this give over the standard diameter engine?
dorkzism 2 months ago
Great video. Thanks for posting.
327409427 3 months ago
They use the highest pressure steam in the smaller cylnder then slightly expanded lower pressure steam in the second cylnder wich has to be bigger to supply same power as first piston then to the third piston wich is at a lower pressure,and this piston has to be even larger to deliver same power as the other two. so they use the steam three times. The Shay locomotive has a engine like this mounted on the right side of the boiler wich drives the wheels through drive shafts,and bevel gears.
chuckbear1961 11 months ago
@spentacle, exactly what I was thinking.
mariasman100 11 months ago
I am ancient enough to have operated a triple expansion engine, but I don't get this one! It looks like the inlet valve is 180deg. out, because it is admitting stem to HP cylinders while the piston is moving towards the port.. It should be going the other way!
spentacle 1 year ago
The "old timers" were pretty damn sharp, weren't they? So many people try to create new designs of the steam engine, but none seem to actually improve on this 150 year old design. (except for the turbine of course)
oldboatclub 1 year ago
Good demonstration of the triple expansion process, but it looks like the flywheel might fall off soon.
tomjec00 1 year ago
Is this at the Museum of Science in Boston?
virginiaorganbuilder 1 year ago