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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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