Uniflow Steam Engine - Revision history

Marcin: /* Examples */

2018-03-17T14:27:15Z

Examples

← Older revision		Revision as of 14:27, 17 March 2018
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	=Examples=		=Examples=
	*[[File:check.png]]Dan Gelbart's uniflow steam engine using modern engineering - [https://www.youtube.com/watch?v=ccjTMQwKWNs]. Brilliant - uses a bump valve with variable cutoff!		*[[File:check.png]]Dan Gelbart's uniflow steam engine using modern engineering - [https://www.youtube.com/watch?v=ccjTMQwKWNs]. Brilliant - uses a bump valve with variable cutoff! With ultra-precision inner bore of [[Air Bearing]], this may be done without lubrication for long lifetime?

	[[Category:Steam Engine]]		[[Category:Steam Engine]]

Marcin at 14:26, 17 March 2018

2018-03-17T14:26:09Z

← Older revision		Revision as of 14:26, 17 March 2018
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	=Examples=		=Examples=
	*[[File:check.png]]Dan Gelbart's uniflow steam engine using modern engineering - [https://www.youtube.com/watch?v=ccjTMQwKWNs]		*[[File:check.png]]Dan Gelbart's uniflow steam engine using modern engineering - [https://www.youtube.com/watch?v=ccjTMQwKWNs]. Brilliant - uses a bump valve with variable cutoff!

	[[Category:Steam Engine]]		[[Category:Steam Engine]]

Marcin at 14:24, 17 March 2018

2018-03-17T14:24:09Z

← Older revision		Revision as of 14:24, 17 March 2018
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	High pressure steam needs to be properly sequenced to dive the piston in the cylinder. This is usually done with values (poppet values being common). Computer controlled solenoids offer some advantages by being able to fine tune the dynamic operation of the engine.		High pressure steam needs to be properly sequenced to dive the piston in the cylinder. This is usually done with values (poppet values being common). Computer controlled solenoids offer some advantages by being able to fine tune the dynamic operation of the engine.

			=Examples=
			*[[File:check.png]]Dan Gelbart's uniflow steam engine using modern engineering - [https://www.youtube.com/watch?v=ccjTMQwKWNs]

	[[Category:Steam Engine]]		[[Category:Steam Engine]]

Mjn: Added category.

2011-05-01T22:22:00Z

Added category.

← Older revision		Revision as of 22:22, 1 May 2011
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	The Uniflow Steam Engine is a very simple kind of steam engine that eliminates counter-flow cycle problems.		{{Category=Steam Engine}}

			The Uniflow Steam Engine (also know as unaflow) is a very simple kind of steam engine that eliminates counter-flow cycle problems.

	=Operation=		=Operation=

Mjn at 21:55, 28 April 2011

2011-04-28T21:55:01Z

← Older revision		Revision as of 21:55, 28 April 2011
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	[[File:Uniflow-Engine.jpg]]		[[File:Uniflow-Engine.jpg]]

	Steam enters one end of a cylinder driving the piston forward. Near the end of it's cycle, an exit hole is uncovered and low pressure (LP) steam escapes. The first valve closes and the second one opens. The piston slides back and forth in it's cylinder.		Steam enters one end of a cylinder driving the piston forward. Near the end of it's cycle, an exit hole is uncovered and low pressure (LP) steam escapes. The first valve closes and the second one opens. The piston slides back and forth in it's cylinder. The double action engine is likely to be more efficient, since it doesn't rely on the momentum of the system to return the piston to the next firing position. However, it is bit more complicated (two valves to control, etc.).

	The single action uniflow engine is even simpler:		The single action uniflow engine is even simpler:

Mjn at 21:53, 28 April 2011

2011-04-28T21:53:10Z

← Older revision		Revision as of 21:53, 28 April 2011
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	Steam enters one end of a cylinder driving the piston forward. Near the end of it's cycle, an exit hole is uncovered and low pressure (LP) steam escapes. The first valve closes and the second one opens. The piston slides back and forth in it's cylinder.		Steam enters one end of a cylinder driving the piston forward. Near the end of it's cycle, an exit hole is uncovered and low pressure (LP) steam escapes. The first valve closes and the second one opens. The piston slides back and forth in it's cylinder.

			The single action uniflow engine is even simpler:

			[[File:Uniflow-Single.jpg]]

			Here, steam enters at one end only and relies on the momentum of the whole system (which could include a flywheel) to bring the piston back to the point where new HP steam is introduced. An encoder on the connector rod could inform a controller (Arduine) as to it's current position.

	=Design Challenges=		=Design Challenges=

Mjn at 21:45, 28 April 2011

2011-04-28T21:45:40Z

← Older revision		Revision as of 21:45, 28 April 2011
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	=Operation=		=Operation=

			A double action uniflow steam engine:

	[[File:Uniflow-Engine.jpg]]		[[File:Uniflow-Engine.jpg]]

Mjn at 21:26, 28 April 2011

2011-04-28T21:26:36Z

← Older revision		Revision as of 21:26, 28 April 2011
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	The Uniflow Steam Engine is a very simple kind of steam engine that eliminates counter-flow cycle problems.		The Uniflow Steam Engine is a very simple kind of steam engine that eliminates counter-flow cycle problems.

			=Operation=

	[[File:Uniflow-Engine.jpg]]		[[File:Uniflow-Engine.jpg]]

	Steam enters one end of a cylinder driving the piston forward. Near the end of it's cycle, an exit hole is uncovered and low pressure (LP) steam escapes. The first valve closes and the second one opens. The piston slides back and forth in it's cylinder.		Steam enters one end of a cylinder driving the piston forward. Near the end of it's cycle, an exit hole is uncovered and low pressure (LP) steam escapes. The first valve closes and the second one opens. The piston slides back and forth in it's cylinder.

			=Design Challenges=

	There was discussion in 2009 about creating such a Uniflow Engine out of high pressure steel steam pipe. This greatly simplifies the fabrication of a cylinder, since no boring is needed. Two end caps could be fastened either by threading or by welding. Seals are the major design challenge in this approach. The piston needs a good seal against the cylinder walls, presumably using [[steam engine piston rings]]. The connecting rod from the piston to the crankshaft also needs a good seal. Tight tolerances on the rod and hole in the end cap may suffice, but high pressure steam will seek any exit point.		There was discussion in 2009 about creating such a Uniflow Engine out of high pressure steel steam pipe. This greatly simplifies the fabrication of a cylinder, since no boring is needed. Two end caps could be fastened either by threading or by welding. Seals are the major design challenge in this approach. The piston needs a good seal against the cylinder walls, presumably using [[steam engine piston rings]]. The connecting rod from the piston to the crankshaft also needs a good seal. Tight tolerances on the rod and hole in the end cap may suffice, but high pressure steam will seek any exit point.
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	The interior of the cylinder needs to be kept lubricated. Water is corrosive to steel and will eventually compromise the interior of the cylinder. It may be better to have removable end caps either threaded (as mentioned above or bolted on. This would allow the cylinder to be disassembled for cleaning and lubrication.		The interior of the cylinder needs to be kept lubricated. Water is corrosive to steel and will eventually compromise the interior of the cylinder. It may be better to have removable end caps either threaded (as mentioned above or bolted on. This would allow the cylinder to be disassembled for cleaning and lubrication.

			High pressure steam needs to be properly sequenced to dive the piston in the cylinder. This is usually done with values (poppet values being common). Computer controlled solenoids offer some advantages by being able to fine tune the dynamic operation of the engine.

	[[Category:Steam Engine]]		[[Category:Steam Engine]]

Mjn: Initial description of a uniflow steam engine.

2011-04-28T21:23:36Z

Initial description of a uniflow steam engine.

New page

The Uniflow Steam Engine is a very simple kind of steam engine that eliminates counter-flow cycle problems.

[[File:Uniflow-Engine.jpg]]

Steam enters one end of a cylinder driving the piston forward. Near the end of it's cycle, an exit hole is uncovered and low pressure (LP) steam escapes. The first valve closes and the second one opens. The piston slides back and forth in it's cylinder.

There was discussion in 2009 about creating such a Uniflow Engine out of high pressure steel steam pipe. This greatly simplifies the fabrication of a cylinder, since no boring is needed. Two end caps could be fastened either by threading or by welding. Seals are the major design challenge in this approach. The piston needs a good seal against the cylinder walls, presumably using [[steam engine piston rings]]. The connecting rod from the piston to the crankshaft also needs a good seal. Tight tolerances on the rod and hole in the end cap may suffice, but high pressure steam will seek any exit point.

The interior of the cylinder needs to be kept lubricated. Water is corrosive to steel and will eventually compromise the interior of the cylinder. It may be better to have removable end caps either threaded (as mentioned above or bolted on. This would allow the cylinder to be disassembled for cleaning and lubrication.

[[Category:Steam Engine]]