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Experimental Investigations and 3D Flow Simulations of a Single-Blade and a Two-Blade Pump for the Analysis of Unsteady Characteristics and Local Losses

Produktform: Buch / Einband - flex.(Paperback)

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.weiterlesen

Dieser Artikel gehört zu den folgenden Serien

Sprache(n): Englisch

ISBN: 978-3-8440-8166-4 / 978-3844081664 / 9783844081664

Verlag: Shaker

Erscheinungsdatum: 11.08.2021

Seiten: 158

Auflage: 1

Autor(en): Steffen Melzer

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