Time for something new. I wanted to create a combustion engine and especially the (old) air plane star engines are looking amazing. Before going there, I like to create a stirling engine first. At least this looks more easy to do..
Some nice info could be found here:
Very nice information about Stirling engines, by:
So after reading the complete world wide web about this subject, I think I'm ready for it.
Let's start with a CAD drawing, to figure out a nice configuration about size & motion of the linkage.
That's looking fine. None of the linkages collide, except the blue excenter disc. But that's simple to solve.
Before creating 6 cylinders and figure out it's not working, I'll build just one Stirling engine first, based on the same dimension like to 6 piston version:
Starting with the cooling element & some plastic parts. Now I got some feeling about the real size.
Add all levers & mount everything together. Surprisily it runs very smooth (like it should)!
I ordered some glass tubes for the displacer cylinder & piston from InstruLabo. This will be the hot side of the engine, instead of the stainless steel. So also the design will be changed a little. Let's wait for the package to arrive...
The glass testing tubes arrived after 2 days. So now it's time to shorten those tubes. Actually that was quite easy. Just put them in the lath, turn very slowly (~200 rpm) and just cut them with a dremel cutting disc. I also used some oil for cooling. With a little patience, both displacer cylinder & piston are cutted very easy.
Since the design is changed, time for an update:
Today a good day, all the parts for the displacer are finished. Also started with the power piston, this part is of stainless steel, gliding over a brass shaft. I hope the tolerances are small enough.
|Also the work piston is installed and the connection of the brass piston rod. When now turning the engine around by hand, it will not even make 2 complete rounds by itself. There is way too much friction in the system. I did underestimated the importancy of friction. So it makes no sence to fire it up.|
Currently this engine is also not working. Some learnings:
After heating up the tea-light:
Despite the effort, it's just not working. I want to create a new fly wheel, with correct phase shift & higher inertia. Hopefully this will solve all the issue's...