NDLI: Hydrodynamics of a Pump-Turbine at Off-Design Operating Conditions: Numerical Simulation

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Hasmatuchi, Vlad Roth, Steven Botero, Francisco Farhat, Mohamed Avellan, Franc¸ois
Copyright Year	2011
Abstract	Flow numerical simulations in a low specific speed radial pump-turbine scale model are performed to investigate off-design operating conditions in generating mode. The Best Efficiency Point (BEP) and the runaway operating conditions at 10° guide vanes opening are addressed. The computational domain includes the full reduced scale model water passage from the spiral casing inlet to the draft tube outlet. The numerical simulation is performed using the Ansys CFX code, solving the incompressible unsteady Reynolds-Averaged Navier-Stokes equations. Wall pressure measurements in the stator are used to validate the numerical results. Then, detailed analysis is focused on the onset of the flow instabilities when the machine is brought from BEP to runaway. In these severe operating conditions, one single stall cell is found to rotate with the impeller at subsynchronous speed in the vaneless gap between the impeller and the guide vanes. It is found to be the effect of flow separation developed at the inlet of several consecutive impeller channels which lead to their blockage.
Sponsorship	Fluids Engineering Division
Starting Page	495
Ending Page	506
Page Count	12
File Format	PDF
ISBN	9780791844403
DOI	10.1115/AJK2011-06090
Volume Number	ASME-JSME-KSME 2011 Joint Fluids Engineering Conference: Volume 1, Symposia – Parts A, B, C, and D
Conference Proceedings	ASME-JSME-KSME 2011 Joint Fluids Engineering Conference
Language	English
Publisher Date	2011-07-24
Publisher Place	Hamamatsu, Japan
Access Restriction	Subscribed
Subject Keyword	Water Navier-stokes equations Computer simulation Flow separation Hydrodynamics Flow (dynamics) Machinery Pump turbines Guide vanes Design Impellers Stators Pressure measurement Flow instability
Content Type	Text
Resource Type	Article

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