[Stoves] "stirring fan"

[AJH]

On Thu, 3 Aug 2006 02:25:15 +0200, Boll, Martin Dr. wrote:

>-A fan with fan-blades, which are each divided into two parts. The more
>central parts blowing, while the more peripheral parts are sucking (-When
>the fan rotates in the same direction). 
>
>-Both parts are divided by a circular ring (-band). This ring does not allow
>the directly flow from the inner to the outer part of the fan.
>
> 

Martin we have discussed just such a device in the past but for a
different purpose, the idea was mooted to make use of a steam jet but
not in an eductor. My experiments with the eductor/aspirator found the
cost of the heat lost in the steam was too great. So the idea was to
pass the steam through a simple axial central turbine and discharge
but the concentric outer section could be an axial or centrifugal fan
passing clean air.

I since developed the idea to combine an induced draught fan and
dilution air fan on one shaft to enable drying of wood chip directly
in the output of a small combustor.

AJH