In a Ringbom engine the temp. difference is greater than in a kinematic one especially in a very small model like this. Here is about 40° C.
I don't have plans for this because I made it upon many experimentation and I do have only some sketch. Maybe I'll do something in the future if I'll get time. Thank you.
Thanks for your comment. No, there is no need of linking the displacer to the flywheel. This is a RINGBOM version, and due to the large size of the displacer rod, the movemets are obtained from the pressure differencies between engine inside and outside.
I wonder why the displacer moves. It appears to me, that the hot end of the cylinder is the bottom, and the rising pressure would force the displacer in top, which in turn again will rise temperature of the air and the pressure. So why does the displacer come down again?
Thanks for comment. The rising pressure is used by the power piston for its active stroke. When the piston is at top dead point, the pressure inside is again under the outside and so the diplacer falls down. The air is cooled again by the upper side of the engin and the pressure further decrease. The flywheel moves the piston for the compression stroke, the pressure inside is higher than outside and the displacer goes up again. Now the cycle is repeating. Ringbom is a very smart cycle!!
What is the temperature difference? Where can I find plans on these?
solidsnake182 2 years ago
In a Ringbom engine the temp. difference is greater than in a kinematic one especially in a very small model like this. Here is about 40° C.
I don't have plans for this because I made it upon many experimentation and I do have only some sketch. Maybe I'll do something in the future if I'll get time. Thank you.
Rickydado 2 years ago
Looks good!
Is there no machanical connection from the displacer to the flywheel? Not needed?
Lee
LeeHill66 3 years ago
Thanks for your comment. No, there is no need of linking the displacer to the flywheel. This is a RINGBOM version, and due to the large size of the displacer rod, the movemets are obtained from the pressure differencies between engine inside and outside.
Rickydado 3 years ago
That is a very nice piece of work.
I wonder why the displacer moves. It appears to me, that the hot end of the cylinder is the bottom, and the rising pressure would force the displacer in top, which in turn again will rise temperature of the air and the pressure. So why does the displacer come down again?
OleTC 3 years ago
Thanks for comment. The rising pressure is used by the power piston for its active stroke. When the piston is at top dead point, the pressure inside is again under the outside and so the diplacer falls down. The air is cooled again by the upper side of the engin and the pressure further decrease. The flywheel moves the piston for the compression stroke, the pressure inside is higher than outside and the displacer goes up again. Now the cycle is repeating. Ringbom is a very smart cycle!!
Rickydado 3 years ago
Ahhh, so the pressure inside is made up of the displacer position and power piston position combined.
Thank You for explaining, I love to watch the model run. It is sort of magic.
OleTC 3 years ago
Yes indeed! It's so fascinating and a like to say that Stirling is "in tune with the universe" :)
Thank you.
Rickydado 3 years ago