Experimental Investigations and 3D Flow Simulations of a Single-Blade and a Two-Blade Pump for the Analysis of Unsteady Characteristics and Local Losses
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The unsteady characteristics and local loss mechanisms of a single-blade and a two-blade pump are investigated by a combined experimental and numerical study. These pumps are designed for solid-laden fluids and clogging-prevention and thus have particular large flow channels with a weak flow guidance, which cause highly three-dimensional fluctuating flow fields and low efficiencies, so that their operation cannot be adequately described by stationary characteristics only. Thus, additional unsteady characteristics in terms of time-resolved pressure, impeller deflection and flow rate are analyzed. For evaluating the flow rate fluctuations, a new measurement method is presented based on an electromagnetic flow meter. With ensemble-averaging, interfering signals acting on the time-resolved measurement signals are filtered out. The validity of the new measurement technique is assessed by accompanied 1D circuit simulations.
Due to the clogging-resistant impeller design, common design concepts for centrifugal pumps cannot simply be adopted and the sole evaluation of the efficiency is not sufficient for few-blade pump optimizations. Thus, a local loss analysis based on local entropy production is presented and applied to the single-blade and two-blade as well as a conventional multi-blade pump. A finite volume method and a statistical turbulence model are employed for the 3D simulations. The simulation results are validated by time-resolved measured characteristics of the pumps. A wall function for entropy production in isothermal flow is derived, implemented in the flow solver ANSYS-CFX and validated on standardized turbulence model test cases. The local loss analysis revealed distinctive pump type specific loss mechanisms in all three pumps.
Due to the clogging-resistant impeller design, common design concepts for centrifugal pumps cannot simply be adopted and the sole evaluation of the efficiency is not sufficient for few-blade pump optimizations. Thus, a local loss analysis based on local entropy production is presented and applied to the single-blade and two-blade as well as a conventional multi-blade pump. A finite volume method and a statistical turbulence model are employed for the 3D simulations. The simulation results are validated by time-resolved measured characteristics of the pumps. A wall function for entropy production in isothermal flow is derived, implemented in the flow solver ANSYS-CFX and validated on standardized turbulence model test cases. The local loss analysis revealed distinctive pump type specific loss mechanisms in all three pumps.
Erscheinungsdatum | 12.08.2021 |
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Reihe/Serie | Berichte aus der Strömungstechnik |
Verlagsort | Düren |
Sprache | englisch |
Maße | 170 x 240 mm |
Gewicht | 237 g |
Themenwelt | Technik ► Elektrotechnik / Energietechnik |
Technik ► Maschinenbau | |
Schlagworte | centrifugal pumps • Entropy Production • Local loss analysis • Time-resolved measurements • Turbulent flow • Wall function |
ISBN-10 | 3-8440-8166-6 / 3844081666 |
ISBN-13 | 978-3-8440-8166-4 / 9783844081664 |
Zustand | Neuware |
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