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I came across this Naca report and while I do not
personally have an interest, I noticed that it addressed how to use vanes in a
ducts to overcome some of the problems of ingesting boundary layers. As
Naca reports of that era go the math is not too bad. But, what may be of
particular interest is starting on page 14 where they give examples of ducts
divided by different number of vanes and If I understood the math, there are
formulas/tables that enable one to determine the separation distances of the
vanes including the important one which controls the ingested boundary
layer.
Unfortunately the document is too large a file to post to
the list, but if anyone is interested, sends me an e mail (yes, please send it
to me rather than just posting to the list that you want it-makes it easier to
simply attached the document and return it to you).
Ideally, of course you would prefer not to ingest the
boundary layer, but not all duct installation designs are idea - other than
mine, of course {:>) This is what happens when I sit around waiting for
the weather to lift.
Anyhow, just thought a few of you might be
interested
Ed
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