Centrifugal Pump Model of the DLR Thermofluid Stream Library

Abstract

Modeling pumps in 1D flows in Modelica is not new. In thispaper a new approach is presented that can be used forgeneral centrifugal pumps as well as centrifugal pumpsbased on measurement data for the DLR Thermofluid StreamLibrary. The presented model is based on dimensionlessnumbers for good scaling. This approach allows to predictthe pump behavior also for pumps where no measurement dataexist based on data from similar pumps. The models aredesigned with focus on numerically robustness. They avoidnon-linear equation systems and work for zero mass flowrate and/or zero angular velocity. Furthermore care hasbeen taken that extrapolation of the pump data outside thedata range is robust without interpolation artifacts. Apump surge example demonstrates that the TFS can handleinstationary behavior like limit cycles by default withoutany further modifications needed.