Jim Sower wrote:

I need a little help here.  I may have got lost back a ways.  Tell me if this is
true:
1.  Cavitation happens when the pump can't "suck" (read "accelerate") the coolant
into the impeller with the flow rate (velocity) that is required by output flow
rate.

2.  The event under discussion took place with the coolant being drawn from and
returned to an open tank with coolant level at some distance below the impeller.

If these things are so, it occurs to me that in a closed system, the coolant
supply to the pump would not be stagnant as in the experiment, but moving at the
same flow rate as the output side of the pump, and under steady state conditions
(no acceleration of the coolant supply) no cavitation would or could occur.

I intuit that the coolant supply to the pump being a stagnant pool rather than a
flowing, closed stream rendered the experiment bogus at the rpm where the onset of
cavitation occurred.

Where did I go wrong?           Jim S.
PS finally got my date/time straightened out ;-)

 
The Aircraft Rotary Engine Newsletter.              Powered by Linux.

http://home.earthlink.net/~rotaryeng/            http://www.linux.org