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!
But
the next post will be very interesting for you! :)
My
friend Simi112's developed an engine what I called "Metronome".
The
engine had a good torque, and the frequency was so stable.
He
modified a water piston Ringbom engine.
The water piston is the power piston in a basic Ringbom constructions as you know. Simi112 changed the pistons, and created a big diameter piston to move the displacer, and a smaller one with water in a tube for phase changing. The engine works well! (check below the video) In March of 2014 I've seen an interesting engine on Dreisotech's youtube channel. He called it Very Simple High Frequency Engine (VSHFE). This engine is same as Metronome the only different is the phase changer piston, because the piston is air here. This construction is faster than the water piston version. When I showed the video to Simi112, we start to develope this construction and we found a little suprise there. The tube could be tune the engine's frequency also we can tune up the whole engine to a resonant frequency, where the amplitude is maximised, and the torque is great! So this engine is a moving displacer thermoacustic engine too! What??? How??? Is this possible? But the cycle is really changed! Not Stirling as in a Ringbom! The tube has a greater resistance than the power piston and the engine works closely as a Manson engine. The tube works like a gas-diode valve. It looks like a fully open engine, but when the pressure increase in the cylinder, then the gas push out the power piston first, and after can „wide open” the gas-diode.
When the "valve" is "opened", the gas piston start to move out with a great momentum and created a vacuumised cylinder after start to cool down the gas in the cylinder. When the inward phase coming and the gas diode "open" again then the gas piston create a pressurised section in the cylinder before the gas start to heat up! It is really interesting and strange. Because the power piston has an increased power under the whole strokes as like Manson!!! But when the "valve" is "open" then the gas piston pre-vacuumise, also pre-pressurise the cylinder in the working method.
The Manson has only pressure relief sections! So...we have an engine with Manson cycle (more or less) with a bigger working pressure intervall. I'll try to show you what I mean about the p-V diagram
When I started to optimimise the original Manson engine that was in 2010. 03.
After I built my first hot side ventillation Manson engine with regenerator.
In 2012 I try to make a valveless Ericsson engine and then I had a Heureka feeling! :)
I crossed my two favorite engines in one.
I called it Kovács caloric engine. (as K.C.E.)
This engine has some typically Manson properties as simplicity, high torque, not much moving part, BETA formation, but the cycle is Ericsson caloric cycle.
The biggest different between the original Ericsson and my hybrid engine is the numbers of power strokes.
The original engine had one power stroke, when the heated gas expanded.
The other stroke was an exhaust stroke.
My engine has another one!:)
When the pressure dropped down in my engine then pull back the power piston.
So this is a pretty NEW engine!
My problem wasn't enough money for patent pending. But it is a "Who cares?" thing. I shared it, so if you can build one, just do it! :)
Simple drawing from the engine's two end points:
and an animated how does it works GIF:
I know these are just some schematic drawings, but the working method is simple.
