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Yes, Finn, "trumpet" shape is probably a better description of the curve
and better implies that it is open to air. How's about we knock the end
out the "Bell" for better air flow
{:>). I was actually thinking of the "Bell" shaped pressure
distribution across the front of a cooler core that you use the "Trumpet" shape
in order to force the diffuser walls into this "Bell" shape higher
pressure distribution. The higher pressure then tends to prevent
flow separation along the walls and results in better pressure recovery and
cooling.
The offical name by K&W is the "Streamline"
diffuser. A closely related diffuser is the "Exponential horn" diffuser
which shares the "trumpet" style shape but is uses a slightly different
coordinate generating math equation. Results from both are reported very
similar.
The streamline duct can ideally give you around 84%
recovery of the dynamic pressure of the airflow. Not bad, I
think.
Ed
Ed Anderson
RV-6A N494BW Rotary Powered
Matthews, NC
----- Original Message -----
Sent: Sunday, August 08, 2004 11:07
PM
Subject: [FlyRotary] Re: New Info on
Tracy's Renesis Engine conversion
Don't you mean "horn" or "trumpet" shaped? If I understand it
right you want to "squeeze" the air out into the edges and
corners.
Finn
Ed Anderson wrote:
For those of you interested, Tracy or rather
Laura has some new info posted on the progress of the Renesis engine
swap.
Note that Tracy is now using the Streamline
duct (Bell shaped) for his radiator and correctly points out that folks
often make the mistake of curving the duct outward in that location - just
the opposite of what you need to do.
Ed
Ed Anderson
RV-6A N494BW Rotary
Powered
Matthews, NC
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