The thing that most worried me about your fin design was that they 'branched out', you'd loose pressure like crazy with each branching, I was going to post before but was unsure of the size/area the barb would cover, if it was small it would of resulted in a single channel branching into four!.
Why not try the calculations on the 'circle cross cut many times style'?, so easy to manufacture!, if the outerwall is in the way, get rid of it!, incorporate it into the plate above(and the O ring cjhannel) 2mm will still be enough to countersink some flush bolts into won't it?. if not: don't get rid of it, just lower it enough for the blades '9 o'clock' point to miss...
I think you're worrying to much about the fins when the real revolution is in the outlet and full balanced use of radial flow...
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PS. what is the definition of 'Impingment'?...
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