Gary Buster wrote:

On another interesting note, he is wanting to experiment with putting

some

"vortex generator vanes" inside the tangent pipe to disrupt the swirling

and

effect a  faster educt into the rest of the system.  I am looking forward

to seeing

how this will turn out!!!

Jeff Spitzer wrote:

There is considerable merit to this idea.  I keep forgetting to warn you
guys about swirl-choke.  That is when a swirling flow reaches sonic
(choked) conditions well before the axial velocity alone.  This

tangential

muffler design is a perfect example of how to cause swirl choking.

Al Gietzen wrote:

I'm the one who suggested to Mark that small vanes be installed to disrupt
to swirl flow in an attempt to both make it more effective as a muffler and
possibly help get the flow toward the exit.  The planned configuration for
my 20B is 5" diameter manifold/muffler (m/m) with a 2 3/4" concentric exit
at the end.  Dave Atkins intuitively felt that an exit out the side (top,
bottom, whatever) at the midpoint would be better than at the end.  I
assumed that it didn't matter much because the pressure drop axially inside
the 5" m/m would be very small.  Of course the internal flow dynamics could
be quite different.  What would your expert opinion be on this.

I also think that flow deflectors just under the m/m inlets from the ports
could reduce potential restriction to flow into the m/m.  Your thoughts?

Is there some question about how well any swirl flow gets established in
this case where you have some very disruptive pulses, as opposed to
continuous flow in the turbine case?

Al Gietzen

 
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