Abstract
The development of a zero-dimensional model for analysing pressure phenomena in multiple stage external gear pumps is addressed in the present work. The tandem pump is composed of two coaxial stages: the high pressure one, made by spur gears, and the low pressure one, made by helical gears. The two stages have common shafts and a common case. The oil pressure course around the gearpair, as well as the suction/delivery pressure ripple, is estimated for both stages. Attention is focused on the description of the modelling approach: an original method is developed to model the helical gears and their effects on the determination of the geometrical parameters. The lumped parameter (LP) model takes advantage of a Computational Fluid Dynamic (CFD) model applied to different pump regions in order to estimate several internal flow features. Measured delivery pressure ripple and volumetric efficiency are used to evaluate the model reliability under different working conditions.
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