Though mine are more specific, I have much the same questions you do. You may want to try posting at
"Computational Fluid Dynamics - Online" i.e. ( http://
www.cfd-online.com ). This is a more erudite usenet than
this one ( not given to snide banter ). See also thread
"npsingh(mechanical)" Jul 25, 2002, in this forum for more
references. I 've seen "Centrifugal Pumps: Design and Application" by V.S. Lebanoff and R.R. Ross, and it is
worthwhile.
     Though heavily theoretical and rather dated by now, a
30 page paper detailing the overall concept is available freely online in PDF format at ( http;//naca.larc.nasa.gov
 /reports/1939/naca-tm-902.pdf ).
     Finally if you happen to know the publication, title,
or author of a particular paper, look for it in the search
engine of ( http;//searchpdf.adobe.com ). An invaluable resource of Adobe the licensor of PDF ( Portable Document
Format ) used mostly for scholarly papers. This is the central index of all PDF files on the net - about a million or so.

Two more internet sites of interest are:
http://www.turbocfd.meng.ucl.ac.uk/3dinv.html
http://sic.epfl.ch/SA/publications/SCR97/scr9-page24.html

P.S.
      delete (.pdf) from end of referenced paper
       it is otherwise readily accessible.

a white paper at
( http://gltrs.grc.nasa.gov/reports/1996/tm-107262.pdf )
describes "BladeCAD" impeller design software. This and the newer "Blademaker" is available from ( www.modelspace.com ).
Also go to ( http://turbo10.com ) and enter "BladeCAD" in
this searchengine for more references.

Go to ( http://naca.larc.nasa.gov ) enter the following
citations in the searchengine, the top result is the paper.
naca-tn-1313, naca-tn-2421, naca-tn-2604, naca-tn-2654, and
naca-tn-2806.