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Here are some photos of what I was able to do with duct
opening size once I understood the design objective. I was able to reduce
the duct opening from 24 sq inches to 10 sq inches. There was a 5 deg F
rise in coolant temp, but probably less cooling drag.
This photo show my truncated Streamline duct contours
a bit better. I simply filled in the shell of the old duct show
above with foam and shaped it until it met my contour templates.
These contour templates shows the rapid expansion
(pressure recovery) typical of the Streamline duct. Normally however, the
entrance would be much longer and some pressure recovery is loss as a results of
the truncation. The extreme of the flair was actually at the edges
of the core surface.
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