Benoit Barthod

Calculating transient flows through ducts of non-constant rectangular shape

Abstract The satisfactory prediction of performances of dry rotary vacuum pumps is dependent on the modelling of the transient flows through clearances between rotors and stators. In the present method of calculation clearances are simulated as ducts whose section evolves with the curvilinear abscissa. The transient flows are identified by the semi-empirical correlation proposed by Dong. ∗ Potential flows are calculated by the singularities method to determine the cross-sections of the duct. The predictions related to a stationary dry Roots pump are compared to measurements.