| Bill,
Here is a picture of the inner pipe of my tangential muffler. Material is 625 Inconel. If I were to do it over I think I would angle the slots at about 45* so they would scoop the exhaust gases as it swirls around inside the larger tube.
Mark On Sun, Apr 11, 2010 at 3:39 PM, Bill Schertz <wschertz@comcast.net> wrote:
Could you post a picture of the internal pipe, in
fact of all the parts?
Bill Schertz
KIS Cruiser
#4045
N343BS
Phase I testing
Sent: Friday, April 09, 2010 7:26 PM
Subject: [FlyRotary] Re: Tangential muffler
Al,
Per Lynn H., the p-port is very sensitive to exhaust back pressure.
So, I made sure to put lots of V-shaped slots in the inner pipe, 109 to be
exact. My goal with my tangential muffler design was to dissipate the
exhaust heat energy, chop up the exhaust pulses into small pieces while
minimizing back pressure. The jury is still out as to how successful I was
at meeting these three goals, but my initial impressions are favorable.
Mark
On Fri, Apr 9, 2010 at 12:29 PM, Al Gietzen <ALVentures@cox.net> wrote:
I’d expect it to be
very effective.
Is the total area
of the slots = or > than the x-section of the 2 ½” pipe?
Is the P-port less
sensitive to exhaust back pressure?
Al
-----Original Message----- From: Rotary motors in aircraft
[mailto: flyrotary@lancaironline.net] On Behalf Of Mark Steitle Sent: Friday, April 09, 2010 7:47
AM To: Rotary motors in
aircraft
Subject:
[FlyRotary] Re: Tangential muffler
Al,
The slotted tube exits
through the aft end of the muffler. It is 2-1/2" the whole way. I
slotted it after I was unable to drill holes through the SS. Cutting 1"
slits was very easy. After making the cuts, I took a hammer and chisel
and made a "V" shaped indent on one side of the cut to increase the exit area
provided by each cut and to encourage the exhaust gasses to flow toward the
exit. Seems to be working. I'll take some sound measurements a
little later on.
Mark
On Fri, Apr 9, 2010 at
11:13 AM, Al Gietzen <ALVentures@cox.net> wrote:
I should make it clear
that my tangential muffler uses a slotted tube that runs down through the
length of the 5" tube. This tube is also inconel and is welded to both
ends, thereby adding strength to the flat ends. I utilized Lynn's
coupling design to allow for movement between the muffler and the engine.
Mark;
This is
interesting. Would you care to give a bit more info – or perhaps provide
a sketch? Where is the exit from the muffler? Does the exhaust exit through
the slotted tube? How big is the tube?
Al
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