I agree with Ernest (even if he clearly must be
completely and totally wrong {:>)), difficult to find any rule of thumb
parameters for a vane.
I have marked the region (red color) in you
duct that I think is most critical in helping the slower moving boundary layer
turn and to prevent/minimize its effect on the rest of the air flow.
Once you have helped the boundary layer accelerate and get around the curve,
then I believe the vane has done about all it can. I would start out the
vane approx 1/2 the depth of your opening in order to try and capture some of
the higher velocity air outside the boundary layer. I would then compress that
air toward the roof of the duct by reducing the distance between vane and top
of duct in order to increase its velocity.
Depending on how fancy you want to make the vane, I
though that perhaps adding slots so the higher velocity air in the lower part
of the duct could help the boundary flow make the turn and further energize
it.
Don't have a clue as to how much this well help, but I
do believe it will help some.
Ed
----- Original Message -----
Sent: Wednesday, July 18, 2007 2:15
PM
Subject: [FlyRotary] Oil cooler
inlet
Attached is a more accurate
drawing of the oil cooler inlet x-section; with a few pressure measurements.
Based on temps, the
average flow velocity into the scoop is about 85 fps (57 mph)
– all at about 160 mph airplane speed. (Point “A” is really about 4-5” ahead
of the scoop.)
Ernest; since you were first
to propose the internal airflow, or vane; what would you think is the
appropriate shape, position, etc. I can understand your
non-participation on the ‘other’ list after being labeled “completely and
totally wrong”. (That’s what you get for not reading his
bookJ).
Others ideas obliviously of
interest as well – ED?
Al
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