Getting back to the original ORIGINAL purpose of this discussion group . .
. An engineer named Farzan Amini ([EMAIL PROTECTED]) sent me a short paper
on cavitation effects at a hydroelectric dam where he works, in Iraq. The
English in this paper needs some editing, and I think the paper needs
another page or so of text to explain what the author has in mind, but it
looks promising. I may upload it after some more work has been done on it,
but for now, anyone interested in this subject should contact me for a copy.
Attached is the title and abstract.
- Jed
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Production Method for Violent TCB Jet Plasma from Cavity
Farzan Amini
Nuclear Engineer(MSc.) .Mechanical Engineer(BSc.)
[EMAIL PROTECTED]
1. Introduction
One of the hydropower plants in our country has 4 Francis turbines so that
two units on the right way(looking downstream) share a common penstock and
a common long tailrace tunnel and other two units on the left also share a
penstock and tailrace tunnel. Upon commissioning of one unit, the hydraulic
transient in the draft tube during load rejection above 75% was excessive.
It was apparent that the guide vane closing law that had been adopted would
result in water column separation during load rejection at full power.
Tests with a slower closing rate showed that the risk of column separation
was reduced, but a violent surge developed in the draft tube close to
maximum over speed. The
measurement equipment in this experiment have a sampling time of
0.01 sec.
The energy level and cavity volume that are produced are much more than
those of
regular TCB(Transients Cavitation Bubbles) experiments, and
therefore, we should expect more effects than the TCB jet.
