Vturbine, Viv, Joe
vturbine wrote:
Yes, Viv, I was thinking that multiple diaphragms might be a possibility in the future, but that would be at a more sophisticated stage.
I think you guys should really have a look (if you didn’t already) it this one:
http://www.aster-thermoacoustics.com/indexeng.html
No moving parts, creating high amplitude sound inside a tube, out of heat(differences).
It looks to me that it is possible to fit diaphragms or pistons at the other end to drive linear alternators. I think I’m going to contact that guy (he’s Dutch like me) to see if he’s interested to join the forum.
vturbine wrote:
Yeah the heat generated is a problem because a lot of it is a waste in an acoustic take-off in this application. Maybe there is a way to use that heat to amplify the oscillator, just as there is an analogous thrust augmenter for a linear thrust application. Maybe some hot air engine principles can be used to reduce the waste heat. Again complexities I don't want to think about too much yet without even a working propane engine
And what, apart from the above mentioned, about your idea (and mine) to use that heat for making the wood gas? With the coaxial setup?
I really think that you don’t have to worry
at all about waste heat.
vturbine wrote: The bad (or at least scary) news is, the stoichiometric mixture on wood gas is 1 to 1. Not even sure how I can do that. I'd need an injector the size of the inlet, wouldn't I? Seems nearly impossible without screwing up the cycle.
With such a large volume of fuel needed, probably pre-mixing with some air would help what looks to be a big mixing problem, though that increases the feed volume even more.
Mmm! That’s going to be interesting! You might use a augmentor at the inlet in the same way, but with a different purpose, as I designed for my PJ-turbine coupling:
A chamber, in your case fed with mixture, enclosing the “outlet” of the inlet and the inlet of the augmentor.
In that way you can split the feed for the inlet from the combustion gasses coming out of the inlet.
Few problems involved though. 1) not tested yet. 2) acoustical problems expected 3) part (half) of the mixture will leave through the augmentor and burn. (might feed your gas generator with that heat to)
Fedde