Hi there, I'm Attila Blade, a huge fan of the DIY Stirling and hot air engines. You are currently on the Blade's World channel's blog.
I made a lot of experiments in the past 20 years from the beer can engines to a nicely machined desktop gadgets also I worked in professional projects worldwide.
You will find here DIY projects, homemade Stirling engine tutorials and interesting experiments, monthly as possible.
THX any help!
It was an annular designed TASHE engine with conical shaped ends and it worked with membranes.
The membranes could help to reduce the Gedeon streaming in the loop.
That stream is a gas flow where the acoustic fluctuation goes.
It could reduce the cycle efficiency.
So the membrane could stop this flow and also it could substitute some gas volume because the gas in tube has mass and elasticity aka spring constant. So it is a spring-mass system.
My friend Tibsim is made an interesting video in his channel about how the gas "piston" moves in the tube
also how the heat start to amplificate this movement:
You could calculate how long could be a full wave length looped thermoacoustic engine at 20˙C and 50Hz.
343,4 m/s : 50 = 6,868 m
So it is a big circle.
The inner geometry and the membranes gives some possibility to reduce the loop's length drastically
because what we want
that is a pressure swing phase shift in the regenerator.
This is a complicate calculation originally few program could help to reduce the optimization,
but I found an easy way how to make a DIY simple
free piston TASHE (thermoacoustic Stirling heat engine) also I made a tutorial for that.
No calculations, no expensive tools, just a simple and working model.
The first working prototype was made with accordion piston, but I realise it is not available for everyone, so I started to develop a latex balloon version from this.
The frequency increased so much.
30--> 60+ Hz
The membranes tighteness and the mass on that is important to tune the frequency.
The engine works well and stable as possible with this low budget configuration.
If you want to build yours, please leave me a link bellow for your replications!
They was founded in 2009 for retailing different type of heat engine models in China only.
Few years later they are opened the borders
and they turned business to international e-commerce services.
This is an old idea from me, but now I had time to draw. :)
A simple top wieved picture from my LTD Ringbom type Stirling engine idea:
The LTD engines with usable electric energy output are huge constructions usually.
They follow the model constructions shape and I think it is a dead end.
Do you know the SunPulse engines?
Sunpulse engines diameter is 2m and the construction's height is nearly same 2m.
Usable hot surface is 3.14 m2
They use big power and displacer pistons.
The direct solar version use conical window to the sun, because the pressure changing can push/pull the material all the time, and this is waste energy if we use just a simple flat surface.
I knew another manufacturer in Germany, but that is not working yet.
That was the Sunmachine.
I saw there first the curved window LTD Stirling engine, and I liked that simple solution for this problem.
After I started to develope my version.
Step by step.
Day by day.
And the loop is closed:
HEUREKA!
Why not use cilindrical shape of this engine?
My IDEA's diameter only 1m, the height is 1m too, but the usable heat contact surface is 3.14 m2 as like SunPulse!!!
Not any huge parts, because inside I have 4 different engine.
These engines working as like twice-double acting Stirling engine.
