Maximum efficiency despite lowest specific speed-simulation and optimisation of a side channel pump

Markus Mosshammer*, Helmut Benigni, Helmut Jaberg, Juergen Konrad

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


Side channel pumps provide high pressure at relatively low flow rates. This comes along with a quite low specific speed and thus with the known disadvantage of a quite poor maximum efficiency. This paper describes the detailed analysis and optimisation of a typical 1-stage side channel pump with an additional radial suction impeller by means of computational fluid dynamics (CFD) simulations. In a first step, the model was successively generated and it was obvious that it has to contain all details including suction impeller and main stage (both 360° models) as well as the pressure housing and all narrow gaps to provide useful simulation results. Numerical simulations were carried out in a stationary and transient way with scale resolving turbulence models to analyse the components in detail. Finally the CFD-simulations were validated with model tests. For the optimisation process it was necessary to generate a reduced numerical model to analyse the effects of more than 300 geometry variations. The findings were then combined to establish the desired objectives. Finally the best combinations were validated again with the full numerical model. Those simulations predict a relative efficiency increase at best efficiency point (BEP) and part load >30% with respect to all given limitations like identical head curve, suction behavior, and dimensions.

Original languageEnglish
Article numberijtpp4020006
JournalInternational Journal of Turbomachinery, Propulsion and Power
Issue number2
Publication statusPublished - 27 Mar 2019


  • (U)RANS
  • CFD
  • Low specific speed
  • Optimisation
  • Side channel pump
  • Simulation

ASJC Scopus subject areas

  • Mechanical Engineering
  • Aerospace Engineering
  • Energy Engineering and Power Technology

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