Index

Circular Stirling

Stirling program

source code

Links

Circular Gamma

Siemens

Alpha

Beta

Gamma

Circular alpha type Stirling engine animation.

	heater cooling water hot gas in heater tube or expansion space. cold gas in cooler tube or compression space regenerator connecting duct hot cap cold cap hot displacer cold displacer gear wheel hot displacer crank cold displacer crank crankshaft hot displacer housing back side wall hot displacer housing crank side wall cold displacer housing crank side wall cold displacer housing back side wall
Degree of cycle (of cylinder 1). 0 30 60 90 120 150 180 210 240 270 300 330 360 Animation speed (cycles/minute.) Stops after 3 minutes. 0 5 10 15 20 25 30 35 40 45 50 55 60
Info to calculate movements. -----------  1. crank angle between the cranks on the crankshaft.  2. Angle between the two cylinders. Often 0 or 90 degrees. HOT DISPLACER  3. cm, =crank radius of the displacer crankshaft cm, =outside diameter of round tube to make the displacer rotor cm^3, =maximum displaced volume (with the length of the displacer) cm, =equivalent piston crank radius (with the length of the displacer as piston diameter) ?  4. cm, length of the displacer.  5. cm, displacer clearance at crankshaft side of the displacer housing.  6. cm, diameter sealing at crankshaft side of the displacer housing.  7. cm, displacer clearance at the back side of the displacer housing.  8. cm, diameter sealing at the back side of the displacer housing.  9. cm, minimal gap between the displacer and the housing on the rounded side. COLD DISPLACER 10. cm, =crank radius of the displacer crankshaft cm, =outside diameter of round tube to make the displacer rotor cm^3, =maximum displaced volume (with the length of the displacer) cm, =equivalent piston crank radius (with the length of the displacer as piston diameter) ? 11. cm, length of the displacer. 12. cm, displacer clearance at crankshaft side of the displacer housing. 13. cm, diameter sealing at crankshaft side of the displacer housing. 14. cm, displacer clearance at the back side of the displacer housing. 15. cm, diameter sealing at the back side of the displacer housing. 16. cm, minimal gap between the displacer and the housing on the cold cap side. Click on this button to recalculate the output values below.

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CALCULATED OUTPUTS.

% 100- 90- 80- 70- 60- 50- 40- 30- 20- 10- 0-	Volume, red= hot, green= total, blue= cold ( % of maximum total volume)
	0	30	60	90	120	150	180	210	240	270	300	330	360
	Angle degree

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HOT VOLUMES
= crank side end clearance dead volume, cm^3.
= back side end clearance dead volume, cm^3.
= hot cap gap side end clearance dead volume, cm^3.
+ -------------
= hot displacer end clearance dead volume, cm^3.
+ -------------
= total hot dead volume volume, cm^3.
= hot active volume, cm^3.
+ -----------
= total hot volume, cm^3.

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COLD VOLUMES
= crank side end clearance dead volume, cm^3.
= back side end clearance dead volume, cm^3.
= cold cap gap side end clearance dead volume, cm^3.
+ -------------
= cold displacer end clearance dead volume, cm^3.
+ -------------
= total cold dead volume volume, cm^3.
= total cold active volume, cm^3.
+ -----------
= total cold volume, cm^3.

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MAXIMUM VOLUMES
= maximum hot active volume, cm^3.
= total maximum hot volume, cm^3.
= maximum cold active volume, cm^3.
= total maximum cold volume, cm^3.
= total maximum engine gas volume (outside regenerator, heatpipes and coolpipes), cm^3.

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AREAS
= hot displacer house cross section area, cm^2.
= hot displacer cross section area, cm^2.
= cold displacer house cross section area, cm^2.
= cold displacer cross section area, cm^2.

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ROTOR CONSTRUCTION

HOT DISPLACER cm.= radius of the cirkels to draw the trochoid shape = diameter of inner gear wheel =radius of the outer gear wheel.
cm.= minimal width of the rotor.		cm.= maximum distance from the crank.
		cm.= minimal distance from the crank.
cm.= maximum width of the rotor. cm.= is the crank radius, also the grid spacing in this picture, and the radius of the inner gear wheel. cm.= outside diameter of the cylinder where the displacer rotor can be made of. The green cross (X)is the place where the crank goes through the rotor.
HOT ROTOR HOUSE CONSTRUCTION
cm.= Distance between the sealings in the housing wall to separate the upper and lower chambres.
cm.= inner height of the rotor housing.		cm.= distance between the center of the crankshaft and the top of the rotor housing.
		cm.= crank radius = spacing of the grid.
cm.= maximum inner width of the rotor housing. The green circle (O)is the circle where the heart of the crank goes through the rotor. The white circle (O)is the pitch circle the internal gear on the rotor.
Equivalent sizes for a cylinder replacer to use in a stirling design program: Use the same crank radius. For the length of the connecting rod, take a big size, like 9999999. If the program does not ask for this input, it means that the program assumes that the gas displacement is sinodial. This is not exact the case for piston-connecting rod-crank combination, but perfect for this type of circular displacer. cm.= cm, is de equivalent piston diameter, or cylinder diameter to use.
COLD DISPLACER cm.= radius of the cirkels to draw the trochoid shape = diameter of inner gear wheel =radius of the outer gear wheel.
cm.= minimal width of the rotor.		cm.= maximum distance from the crank.
		cm.= minimal distance from the crank.
cm.= maximum width of the rotor. cm.= is the crank radius, also the grid spacing in this picture, and the radius of the inner gear wheel. cm.= outside diameter of the cylinder where the displacer rotor can be made of. The green cross (X)is the place where the crank goes through the rotor.
COLD ROTOR HOUSE CONSTRUCTION
cm.= Distance between the sealings in the housing wall to separate the upper and lower chambres.
cm.= inner height of the rotor housing.		cm.= distance between the center of the crankshaft and the top of the rotor housing.
		cm.= crank radius = spacing of the grid.
cm.= maximum width of the rotor housing. The green circle (O)is the circle where the heart of the crank goes through the rotor. The white circle (O)is the pitch circle the internal gear on the rotor.
Equivalent sizes for a cylinder replacer to use in a stirling design program: Use the same crank radius. For the length of the connecting rod, take a big size, like 9999999. If the program does not ask for this input, it means that the program assumes that the gas displacement is sinodial. This is not exact the case for piston-connecting rod-crank combination, but perfect for this type of circular displacer. cm. is de equivalent piston diameter, or cylinder diameter to use for the cold piston.