Building a Flow bench

[Tony Bryant]

On Fri, 01 Feb 2002 08:32, you wrote:
> 944Technologist wrote:
> > I have been thinking about this project for years and always intended to
> > use a leaf blower. I still need a meter. I looked up the specs on the
> > leaf blower that I have and it draws twice the air that I will require. A
>
> Ah, but you are forgetting the other important variable, the
> pressure ratio at which this flow occurs.  The leaf blower specs
> are for free air on both sides of the turbine, which is probably
> a pressure ratio of 1.2:1 or something really low.  When you
> go to put it on a flow bench you want (iirc from a previous
> post on this thread) about 25 in/Hg, or about 17 kPa absolute,
> giving a pressure ratio across the turbine of about 6:1 or
> higher; it just ain't gonna happen.

I pulled apart my leaf blower and reduced the turbine clearance by
adding strips of 100MPH tape. About doubled its usuable pressure.
Can still only flow about about 6", but its better than 3".

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