The room between the piston

Niels · Post by **Niels** » Thu Apr 12, 2007 10:32 am

Hello,

I'm new here. I would like also to make a striling machine.
I come from Netherland, so if i make mistakes in this letter, i'm sorry.

I have starter a begin with the machine, i have make the displacer piston and the displacer cylinder with the piston cylinder on it and other things.
But now i have a question. How large may the room between the displacer cylinder and the displacer piston? If you will see pictures (photos) than can ik make theses.

Niels
from Holland

Post by **Administrator** » Thu Apr 12, 2007 12:24 pm

Niels,

Depends on the stirling engine you are building.

If you are talking about the "Walking Beam Engine"
http://www.boydhouse.com/stirling/index.html

The gap should be about 1/4" tp 3/8" between the displacer piston and the displacer cylinder.

The job of the displacer piston is to chase the air to the top or to the bottom on the cylinder. The air goes around the piston (the 1/4" gap) to get to the other side. Hence the name "displacer".

When the displacer piston is up, the air is forced down to the bottom. The air heats up and expands and the cylinder becomes pressurized and pushes the "power piston" (on the side) out.

When the displacer piston is down, it forces the air to the top and the air cools down and creates a "vacume" in the cylinder and that "sucks" the power piston (on the side) back in.

Those are the two cycles of the Walking Beam Stirling engine.

http://www.boydhouse.com/stirling/cycle/index.html

http://www.boydhouse.com/stirling/cycle ... rame1.html

Darryl

Niels v.v · Post by **Niels v.v** » Fri Apr 13, 2007 6:22 am

Thank you for your answer.

Yes, I make a walking beam engine. The room between it by me is good.
And I understand it now more with your explane.

Sometings else, yesterday I have register me here. But today I can log in, and my name by the first post is disepers and now state there ''Guest'' how can that happening? I have try everything but I have my self register me again on the same name and it succeeded. I hope that my account now continue exist, so that I here what more often can post.

Post by **Administrator** » Fri Apr 13, 2007 7:18 pm

Niels,

Sorry for the problem registering. It is hard to keep the spamers off the forum and sometime I make a mistake. In your case, you did not give a first and last name when you registered.

That got you deleted..........I think??????

Darryl

Niels v.v · Post by **Niels v.v** » Sun Apr 15, 2007 5:30 am

I don't now exactly what I have filled in but now is it oke.

I build the machine further and leave here what photograph to see.