2014. november 10., hétfő

Standing wave thermoacoustic engine with mechanical resonator

What is the mechanical resonator?

This is a simple solid piston with adjustable spring, or back buffer volume.
The mechanical resonator can replace the acoustic resonator easily.
"Simulation calculations show that the mechanical resonator dissipates 40 % less 
acoustic power than the acoustic one." 

Wouw! :)

How we can make one?
So simple but
some basic information first.

As you can see on this picture (FIG. 1), if you need to close a thermoacoustic standing wave engine, then the closed resonator part (right side) should be same length as left side, the sound generator base.
The whole system is a half wavelenght thermoacoustic engine.
The stack's center on the λ/8 exactly.

But what we can do with a mechanical resonator?
We can replace the whole resonator tube length( λ/4=4/8 of whole tube length) +  the volume between the cold heat exchanger to the resonator tube ( λ/16= 1/8 length).
So what we can do?
We can replace the whole length 5/8th part.
That is nearly 2/3 of full length!
After we get a short engine like this:

Where the 104 is a buffer volume. This volume help for the gas flow going trough the 112 stack
 also the 108-110 heat exchangers.
114 is the piston and the back side is a generator also "gas spring volume", or solid spring of course.


We know "everything" to make a simple TAMR.

I made a short DIY video for you how do you make your first model from ordinary materials.

After I made another model from a big diameter test tube and accordion piston.
That was so speedy, strong and simple of course.

The engines frequency was lower than original because the weight/spring tension was different.
Not optimal, but the engines are works with an enough frequency for me.
I hope you enjoyed!
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See you soon!