Message-ID: <009c01c380a2$9e6ce5e0$1702a8c0@WorkGroup>
From: "Ed Anderson" <eanderson@carolina.rr.com>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
References: <list-2588326@logan.com>
Subject: Re: [FlyRotary] Re: DIE Power Calculations
Date: Sun, 21 Sep 2003 20:43:57 -0400
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Hi John,

    Yes, I understood the sketch without any problem.  The divider would
make your "Chamber" very similar to Tracy Crooks "Chamber" other than he
uses the two secondary ports of the stock Mazda TB rather than just one
opening.  He divides the airflow between his secondaries and primaries very
similar to the way you do.  My "chambers" are a bit different in that I kept
the primary and secondary runner completely separate each with their own
throttle body opening.  But conceptually the same.

   You are correct, the one absolute minimum requirement for DIE is that the
ports MUST be interconnected without anything that might disrupted the FAW.
I don't see where that would hurt your turbo application (in fact having
something to sort of ensure the airflow coming in the opening is divided up
between secondary and primary runners is probably a good idea.  Otherwise,
path of least resistance might send more air down one set of runners and
less down the other.  There! my short answer.

 However, I am not familiar with your installation.  IF you are using an
intercooler with your tubo (recommended), I have a feeling that the Finite
Amplitude Wave (FA) would be disrupted to some extend by the intercooler -
Just not certain how much and what effect that would have.  It might
considerably diminish the DIE or not - just don't know.

    But, on the other hand you are using a turbo, so while I am confident
the DIE effect would be there, its contribution could possibly be less than
a NA engine.  Another reason I am thinking that is I am uncertain how the
wave's energy conversion to kinetic to dynamic pressure might be affected.
The sound of speed (of the wave) is of course dependent on the density of
the medium it is traveling through.  Normally in atmosphere the air density
equates to the air temperature.  Higher temps/less dense etc.  However, in a
turbocharge intake manifold you are going to have greater than normal air
density and also more heat.  I think that would increase the speed of sound
in that medium - perhaps significantly. While I would think that would
increase the dynamic pressure recovered from the wave, don't really know.
Even so, then that speed increase would tend to throw off any DIE
calculations until those things were factored in.  So would the DIE
contribution be the same, more, less when running boost - I really don't
know.

   However, on second thought, you are not going to be under boost all the
time and DIE might well contribute to less pumping losses say at cruise
airspeed giving you a bit of a fuel economy increase (provided the
intercooler doesn't interfer).  So I don't see anything to lose by having
your welder put in the divider and it might possible give a boost in some
areas.

Ed