[Stoves] attempt at swirling secondary air

[David Young]

On Wed, Apr 30, 2014 at 07:26:31AM +0800, Crispin Pembert-Pigott wrote:
> In general, I feel you will get better results and at less cost by using
> incoming secondary air to achieve the effect. 

Thanks for the advice about constructing the blurted channels, I will
give it a try.  Building the strakes, while it was good fabrication
experience and math practice, was quite time-consuming!  I'm glad for an
alternative.

> Make/find a metal rod the diameter of hole you want.
> 
> Sharpen it enough to go into the drilled hole.

Sharpening the metal rod sounds like a job that I should be able to do,
by hand, with a file.  For a more uniform shape and faster results, I
will try to turn the rod with an electric drill.

> The blurted hole is far better at getting air into a combustion chamber with
> velocity and direction. The tools are home made. You may have to reduce the
> hole size, it is so much more effective than a drilled, sharp-edged hole.

Is it reasonable to draw an analogy here between air flow and
sound/electromagnetic wave motion?  Is the air "diffracted" by the sharp
edge?

Dave

-- 
David Young
dyoung at pobox.com    Urbana, IL    (217) 721-9981