On Tue, Dec 6, 2011 at 9:05 AM, Robin D. Bussell <RobinB@excelerate.info>wr=
ote:

> Hi Folks,
>           What are your thoughts on simple (ish ) ways of conditioning
> the output of a fan to give a nice smooth air flow for testing an
> ultrasonic anemometer? I'm not too fussed about absolute speed accuracy,
> it's more having a nice smooth source to test the stability of the
> direction sensing that I'm interested in.
>
> Something like the Dyson Air Multiplier:
>  http://www.dyson.co.uk/store/fans.asp
>  looks like it might make an off the shelf solution but might be
> difficult to get bought (or to keep hold of once the office sees it!  ).
>
> Tube full of straws to induce laminar flow?  Just a long tube to let
> things "settle down"  after the blades?
>
> Any input welcome :)
>
> Cheers,
>
> Robin Bussell.
>
>
>
>
Put your test on the inlet side of the fan. Smoothing out the flow after
the fan is much more difficult.

-Denny
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