These machines generally have a volumetric flow distribution, which although symmetrical about the core centre-line, increases from the end of the machine to maximum in the middle. The rise of volumetric flow is attributed to an axial increase of interpolar static pressure caused by change of kinetic to potential energy due to air bleed-off through the core ducts. Equations predicting the pressure losses for the rotor/stator combination are itemized, together with an expression for head generation by the salient poles. A comparison is made between predicted volumetric flow distribution and a machine test result.
Get full access to this article
View all access options for this article.
References
1.
FechheimerC. J.‘Ventilation of revolving-field salient pole alternators’, Trans. Am. Inst. elect. Engrs193049, 548.
2.
ZemliyanoiM. I.MinayevA. A.‘Ways of improving the ventilation of large water-wheel generators’, Elektrosila1956 (No. 14), 71.
3.
FilippovI. F.‘A method of accounting for the self-cooling effect of rotating machine rotors’, Élektrichestvo1964 (No. 9, September), 53.
4.
OšlejšekO.‘Ventilation effect of radial ventilating ducts in electrical machines’, Elektrotech. obz.196655, 529.
5.
MunchB.ZardinH.‘Analytical and experimental study of ventilation of rotating electrical machines’, Paper 115, Conf. Internationale des Grands Reseaux Electriques à Haute Tension 1964.
6.
LiebeW.‘Kühlung von Grossmaschinen’, Elektrotech. Z. Ausg. A196687, 434.
7.
LimboraK.‘New developments in ventilation and heat measurements on hydro-alternators’, Elektrotech. obz.196150 (October), 577.
8.
CarewN. J.FreestonD. H.‘Fluid flow losses in a.c. generator stator ventilating ducts’, Symp. Subsonic Fluid Flow Losses in Complex Passages and Ducts, Proc. Instn mech. Engrs1967–68182 (Pt 3D), 87.
9.
DuncanThomYoungMechanics of fluids1960, Chapter 3 (Arnold Ltd, London).
10.
WidgerG. F. T. Private communication.
11.
AshleyC. M.GilmanS. F.ChurchR. A.‘Branch fitting performance at high velocity’, Trans. Am. Soc. Heat. Air-Condit. Engrs195662, 279.
12.
KatzS.‘Mechanical potential drops at a fluid branch’, Trans. Am. Soc. mech. Engrs, J. bas. Engng1967 (December).
13.
BartonJ. R.‘A study of diverging flow in pipelines’, M.S. thesis, State University of Iowa, 1946.
14.
McNownJ. S.‘Mechanics of manifold flow’, Paper 2714, Trans. Am. Soc. chem. Engrs1954119, 1103.
15.
BennettR. B.PooleR. M.‘Fluid flow losses associated with the cooling of electrical machines’, Symp. Subsonic Fluid Flow Losses in Complex Passages and Ducts, Proc. Instn mech. Engrs1967–68182 (Pt 3D), 96.
16.
FilippovI. F.Problems of cooling electrical equipment1964 (Moscow).
17.
CarlsonL. W.IrvineT. F.Jun.‘Fully developed pressure drop in triangular shaped ducts’, Trans. Am. Soc. mech. Engrs, J. Heat Transfer196183 (4), 441.
