[Gasification] thermoacoutics, rijke tubes, sondhauss tubes, pulse jets-- how do we make them not work?

[WJ Seidl]

Jim:
Drill a hole.  That's right, a hole.  About 1/4 inch should do.
Put it a few inches up on that pipe extension (from the joint you added 
that section to)
If that doesn't solve it, put a bolt or rod in that hole, across the gas 
path.  That should do it.
If you don't care for a hole, try adding a bend at the top of the tube, 
say 45 degrees full diameter.

The trick is to modify the modulation frequency of the gasses passing 
out of the pipe.
But you already know that.

Best,
Wayne

On 2/16/2011 2:11 AM, jim mason wrote:
> any ideas out there for how to make a pulse jet robustly not work?
>
> we're having lots of problems with thermoacoustics now that we've put
> a tall stack on our gasifier swirl burner.  we're using a tall stack
> now to keep startup gasses away from the operator.   the swirl burner
> is 5" in diameter, 10" tall.  we've added a 4 foot or so stack of the
> same 5" diameter.   it looks like this
> http://www.gekgasifier.com/forums/showthread.php?t=501  (though this
> one without the joint at 10")
>
> when run under high load, it howls rather loudly.  if art, it would be
> fabulous.  if a genset, not so good.
>
>
> any other ideas or experience for how to make your pulse jet not work
> under any circumstance?
>
> jim
>
>    

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