reduced flow-rates in turbopumps produce significant unsteady phenomena, characterized by separation and back-flow. In this study an LES approach coupled with an immersed-boundary methodology is utilized to investigate the changes in the flow physics, when compared to nominal flow-rates. The present methodology has been already validated for the design case through comparison with PIV experiments in the literature. It will be shown that for a reduced flow rate (40\% of the design one) separation phenomena are generated on the suction side of the rotor blades and on the pressure side of the stator ones. Significant spanwise non-uniformity is produced in the diffuser channels, with a displacement of the flow towards the hub side and back-flow on the shroud side. The values of turbulent kinetic energy are increased by an order of magnitude at off-design conditions and the main source of turbulence is not anymore the flow from the suction side and the trailing edge of the rotor blades: most turbulence is generated now at the leading edge of the diffuser blades. The increased interaction between rotating and stationary parts implies also a stronger dependence of the flow features on the relative position between impeller and diffuser blades.

Large-eddy simulations of a mixed-flow pump at off-design conditions / Posa, A.; Lippolis, Antonio Donato; Balaras, E.. - (2014). (Intervento presentato al convegno 67th Annual Meeting of the APS Division of Fluid Dynamics, Session R25: LES: Applications and Modeling).

Large-eddy simulations of a mixed-flow pump at off-design conditions

LIPPOLIS, Antonio Donato;
2014-01-01

Abstract

reduced flow-rates in turbopumps produce significant unsteady phenomena, characterized by separation and back-flow. In this study an LES approach coupled with an immersed-boundary methodology is utilized to investigate the changes in the flow physics, when compared to nominal flow-rates. The present methodology has been already validated for the design case through comparison with PIV experiments in the literature. It will be shown that for a reduced flow rate (40\% of the design one) separation phenomena are generated on the suction side of the rotor blades and on the pressure side of the stator ones. Significant spanwise non-uniformity is produced in the diffuser channels, with a displacement of the flow towards the hub side and back-flow on the shroud side. The values of turbulent kinetic energy are increased by an order of magnitude at off-design conditions and the main source of turbulence is not anymore the flow from the suction side and the trailing edge of the rotor blades: most turbulence is generated now at the leading edge of the diffuser blades. The increased interaction between rotating and stationary parts implies also a stronger dependence of the flow features on the relative position between impeller and diffuser blades.
2014
67th Annual Meeting of the APS Division of Fluid Dynamics, Session R25: LES: Applications and Modeling
Large-eddy simulations of a mixed-flow pump at off-design conditions / Posa, A.; Lippolis, Antonio Donato; Balaras, E.. - (2014). (Intervento presentato al convegno 67th Annual Meeting of the APS Division of Fluid Dynamics, Session R25: LES: Applications and Modeling).
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11589/22930
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