Steam Engine Specifications/Work Diagram Construction - Revision history

Mjn at 23:54, 25 May 2011

2011-05-25T23:54:04Z

← Older revision		Revision as of 23:54, 25 May 2011
Line 12:		Line 12:
	# Make OR the clearance displacement percent.		# Make OR the clearance displacement percent.
	# Make RX the length of the stroke		# Make RX the length of the stroke
	# Draw RA perp. at the clearance displacement length to represent 0.95 of the ~~boiler pressure~~.		# Draw RA perp. at the clearance displacement length to represent 3-8% (med. speed engine) of the total displacement.
	# Draw AK at 0.98 of the boiler pressure		# Draw AK at 0.98 of the boiler pressure
	# Draw KX at the stroke length.		# Draw KX at the stroke length.

Mjn at 18:14, 16 May 2011

2011-05-16T18:14:33Z

← Older revision		Revision as of 18:14, 16 May 2011
Line 12:		Line 12:
	# Make OR the clearance displacement percent.		# Make OR the clearance displacement percent.
	# Make RX the length of the stroke		# Make RX the length of the stroke
	# Draw RA perp. at the clearance ~~displament~~ length.		# Draw RA perp. at the clearance displacement length to represent 0.95 of the boiler pressure.
	to represent 0.95 of the boiler pressure.
	# Draw AK at 0.98 of the boiler pressure		# Draw AK at 0.98 of the boiler pressure
	# Draw KX at the stroke length.		# Draw KX at the stroke length.

Mjn at 18:13, 16 May 2011

2011-05-16T18:13:18Z

← Older revision		Revision as of 18:13, 16 May 2011
Line 2:		Line 2:

	=Construction of a Work Diagram=		=Construction of a Work Diagram=

			[[Image:Steam_Engines-fig-7.png]]

	Refer to fig. 7 in "Steam Engines'		Refer to fig. 7 in "Steam Engines'

Mjn at 18:12, 16 May 2011

2011-05-16T18:12:32Z

← Older revision		Revision as of 18:12, 16 May 2011
Line 26:		Line 26:
	Area of actual diagram is slightly smaller than the theoretical:		Area of actual diagram is slightly smaller than the theoretical:

	{\|		{\| border="1"
	\|-		\|-
	\|Large, med. speed		\|Large, med. speed

Mjn: Created page with "{{Category=Steam Engine}} =Construction of a Work Diagram= Refer to fig. 7 in "Steam Engines' '''Procedure''' # Determine the initial pressure, ratio of expansion, and percent..."

2011-05-16T18:11:24Z

Created page with "{{Category=Steam Engine}} =Construction of a Work Diagram= Refer to fig. 7 in "Steam Engines' '''Procedure''' # Determine the initial pressure, ratio of expansion, and percent..."

New page

{{Category=Steam Engine}}

=Construction of a Work Diagram=

Refer to fig. 7 in "Steam Engines'

'''Procedure'''
# Determine the initial pressure, ratio of expansion, and percent of clearance.
# Draw lines OX and OY at right angles.
# Make OR the clearance displacement percent.
# Make RX the length of the stroke
# Draw RA perp. at the clearance displament length.
to represent 0.95 of the boiler pressure.
# Draw AK at 0.98 of the boiler pressure
# Draw KX at the stroke length.
# Draw LH at 14.7 psi for atmospheric pressure.
# Locate cutoff point B for expansion ratio (1/8, 1/4, etc. of stroke len)
# Divide BK into equal distances (a,b,c, etc)..
# Connect them to point O
# Extend horizontals from the points where diagonals meet with line BP.
# Extend verticals down from (a,b,c, etc)
# Connect these points to form the expansion curve.
# Back pressue curve at FD about 2psi above atmospheric
# Compression curve at DE, rounded up to start of cycle.

Area of actual diagram is slightly smaller than the theoretical:

{|
|-
|Large, med. speed
|0.90
|-
|Small, med. speed
|0.85
|-
|High speed
|0.75
|-
|}

[[Category:Steam Engine]]