... e-mail:  mehrdad.raisee.dehkordi@ltu.se e-mail:  michel.cervantes@ltu.se 03 10 2023 11 01 2024 22 03 2024 rotating vortex rope hydraulic turbines swirling flow part load pressure measurement turbine efficiency With the increased share...

... (CSC) and the School of Engineering (University of Warwick) are highly appreciated. References 1 Escaler , X. , Egusquizaa , E. , Farhat , M. , Avellan , F. , and Coussirat , M. , 2006 , “ Detection of Cavitation in Hydraulic Turbines ,” Mech. Syst. Signal Process. 20...

... characteristic. 20 09 2010 17 03 2011 11 05 2011 11 05 2011 blades channel flow flow instability flow simulation hydraulic turbines pumps rotors stators vortices rotating stall stationary vortex formation unsteady vortex formation S-shape, unstable characteristic...

... only qualitative, and no quantitative values of the force moments on rotating circular back shroud were given. hydraulic turbines hydrodynamics mechanical stability pumps rotational flow rotors vibrations 11 05 2009 12 05 2010 08 07 2010 08 07 2010 Figure 4...

... inlet is reduced by J-grooves. 28 04 2009 30 05 2010 29 06 2010 29 06 2010 flow control flow measurement hydraulic turbines pipe flow velocity measurement vortices fluid machinery diffuser swirl flow draft surge J-groove At partial-load operation...

... Simulation of Three Gorges Hydraulic Turbine and Analysis of Pressure in the Whole Passage,” Journal of Hydroelectric Engineering, 23 (5), pp. 97–101. Hassan , O. , Probert , E. J. , Morgan , K. , and Weatherill , N. P. , 2000 , “ Unsteady Flow Simulation Using Unstructured Meshes...

... and the overload vortex rope at the draft tube inlet being reproduced reasonably, indicate that the present method has sufficient potential to simulate the cavitating flow in hydraulic turbines. Further, the unsteady cavitating flow simulation through the Francis turbine is conducted as well to study the pressure...

... investigations are presented by Paik et al. ( 11 ), comparing unsteady Reynold's averaged Navier-Stokes (3D URANS) and direct numerical simulation (3D DNS) numerical simulations in a hydraulic turbine draft tube. Globally, the phenomenology is well predicted, but discrepancies persist in the turbulence...

... and different stationary blades, giving a different and original interpretation about the source of the vibration characteristics. A successful corrective action is proposed as a consequence of this new interpretation. 09 02 2006 26 05 2007 blades hydraulic turbines pumps rotors stators...

...B. Daniel Marjavaara; T. Staffan Lundström; Tushar Goel; Yolanda Mack; Wei Shyy A multiple surrogate-based optimization strategy in conjunction with an evolutionary algorithm has been employed to optimize the shape of a simplified hydraulic turbine diffuser utilizing three-dimensional Reynolds...

... 20 01 2006 vortices pipe flow turbulence flow simulation Navier-Stokes equations hydraulic turbines blades Francis turbines usually experience unsteady flow fluctuations at partial loads, due to a strong helical vortex rotating like a whirling rope in the center of the draft...

... Coanda interaction between the bucket cutout area and the water jet. hydraulic turbines flow simulation flow visualisation pattern formation jets two-phase flow confined flow Performance prediction of hydraulic machines, such as efficiency and dynamic behavior under different operating...

... ) practically constant in Eq. 8 . Relative flow angle on streamtubes An important property of the swirling flows downstream a constant pitch hydraulic turbine runner is that the relative flow angle depends only on the blade exit angle provided that the flow remains attached. This is certainly...

.... 15 Nov 2001 23 Feb 2003 27 08 2003 swirling flow hydraulic turbines error analysis pipe flow computational fluid dynamics The use of computational fluid dynamics (CFD) in industry has increased dramatically in recent decades and is now used in many fields...

... are required. Multistage Pump Axial Thrust Impeller Side Chamber Fluid Rotation Static Pressure Distribution pumps hydraulic turbines rotational flow laser Doppler anemometry flow simulation 12 April 2001 12 September 2001 28 05 2002 Contributed by the Fluids...