Experiments on three different designs of pumps, one fitted with a hydraulic thrust control bearing, employed various speeds and geometric similarity extending also to the wall surface roughness and the play between the rotor and the stator. The experiments show that the efficiency values can differ in homologous operating conditions, without any clearly defined law of affinity between the power and the shaft. Applying the similarity law to the overall power, disregarding the mechanical losses, however, permits accurate forecasting of the operating parameters thoughout. A recalculation formula considering separately the hydraulic and mechanical efficiencies, with correction base on a statistical analysis, is probably a more realistic solution to the problem.
Hydraulics/turbo machinery research. Effects of mechanical losses on the affinity characteristics of turbopumps
Pavesi G.
1987
Abstract
Experiments on three different designs of pumps, one fitted with a hydraulic thrust control bearing, employed various speeds and geometric similarity extending also to the wall surface roughness and the play between the rotor and the stator. The experiments show that the efficiency values can differ in homologous operating conditions, without any clearly defined law of affinity between the power and the shaft. Applying the similarity law to the overall power, disregarding the mechanical losses, however, permits accurate forecasting of the operating parameters thoughout. A recalculation formula considering separately the hydraulic and mechanical efficiencies, with correction base on a statistical analysis, is probably a more realistic solution to the problem.Pubblicazioni consigliate
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