Jeff Spitzer wrote:

At 08:36 AM 9/11/99 -0700, you wrote:

Kuchemann & Weber in their McGraw Hill book; The Aerodynamics
of Propulsion surmised that there existed recirculation
in the core due to the low pressure on the back side of
the fins. I find that hard to believe at high dynamic
pressures but I guess it is possible at certain air
speeds.

That's circulation, not recirculation.  Circulation is a aero term used to
model a lifting surface.  The point of the passage is that the fins have
lower speed on the bottom than the top just like a wing due to the angle of
attack.  There is no indication that air flows backwards any more than it
does on your airplane wing.

Jeff Spitzer

Thanks for clarifying that Jeff. I was confused by the little
arrows showing the air flowing backwards through the core. 

What do you think the of the increased turbulence idea?

Perhaps what we are seeing is merely the fact that
a thin core in oblique flow has a higher pressure drop
so it is equavalent to a thicker core in axial flow
but it fits in the cowl better than an equavalent thick
core? This is a facinating subject for me and I am 
intensely curious on why these oblique flow radiators 
seem to be working so well.

BTW do you have the K & W book? I can scan a couple of 
more pages on this subject and send them to you.

Paul Lamar
 
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