... dimensionless power coefficient and efficiency for the pump under consideration. The goal of modifying the affinity laws for power input is achieved by developing a new relationship where the power coefficient is modified by multiplying it by rotational Reynolds number raised to a power Π * Re w − Pat...

.... 13 12 2011 17 12 2012 Rotordynamic instability due to fluid flow in seals is a well known phenomenon that can occur in pumps as well as in steam turbines and air compressors. While analysis methods using bulk-flow equations are computationally efficient and can predict dynamic...

...Angelo Pasini; Lucio Torre; Angelo Cervone; Luca d’Agostino The paper illustrates the results of an experimental campaign conducted in the Cavitating Pump Rotordynamic Test Facility at ALTA S.p.A., aimed at characterizing the rotordynamic forces acting on a whirling four-bladed, tapered-hub...

...Lucio Torre; Angelo Cervone; Angelo Pasini; Luca d’Agostino The paper shows the results of an experimental campaign conducted in the CPRTF (Cavitating Pump Rotordynamic Test Facility) at ALTA S.p.A., aimed at characterizing the cavitation thermal effects on two tapered-hub, variable-pitch inducers...

...Xiaofeng He; Wei Huang; Bihai Zhu; Liang Luo The purpose of this paper is to investigate the air suction characteristics of a water hydraulic piston pump with check valves. The influence of some factors on its air suction performance, including compression ratio, initial spring forces, valve gaps...

...J. Liu; Z. Li; L. Wang; L. Jiao Three-dimensional (3-D) unsteady incompressible and non-cavitating flow in a radial flow pump during the rapid stopping period was numerically studied by CFD. The dynamic mesh (DM) method combined with non-conformal grid boundaries was applied to simulate...

...Lucio Torre; Angelo Pasini; Angelo Cervone; Luca d’Agostino The present paper illustrates the results of an experimental campaign conducted in the Cavitating Pump Rotordynamic Test Facility (CPRTF) at ALTA S.p.A. aimed at characterizing the rotordynamic forces acting on two different whirling...

...Zhifeng Yao; Fujun Wang; Lixia Qu; Ruofu Xiao; Chenglian He; Min Wang Pressure fluctuation is the primary reason for unstable operations of double-suction centrifugal pumps. By using flush mounted pressure transducers in the semispiral suction chamber and the volute casing of a double-suction pump...

...Andrea E. Catania; Alessandro Ferrari An experimental-theoretical study has been carried out on high-pressure volumetric radial-piston pumps for diesel fuel injection systems. The dependence of the pump inducted flow rate on speed and load was investigated and the characteristic curve of the pump...

... in a centrifugal pump. The resulting fluctuating loads are quantified using numerical computations. For the chosen configuration transient PIV data are available for validation. In addition to measuring the stall frequency in the stationary frame, the CFD data is analyzed in the rotating frame. A Fourier analysis...

...Yuka Iga; Kei Hashizume; Yoshiki Yoshida In the present study, numerical analysis of a cavitating three-blade cyclic flat-plate cascade was performed considering cavitation surge, which is a type of cavitation instability in pumping machinery. A numerical method employing a uniquely developed gas...

...Vlad Hasmatuchi; Mohamed Farhat; Steven Roth; Francisco Botero; François Avellan An experimental investigation of the rotating stall in reduced scale model of a low specific speed radial pump-turbine at runaway and turbine brake conditions in generating mode is achieved. Measurements of wall...

...Xu Yang; Zongchang Qu; Yuyuan Wu A new synchronal rotary multiphase pump (SRMP) is presented, which is geometrically simple and easy to manufacture. With the rotary cylinder, the frictional losses between the major components of the SRMP are minimized. Its structural design and working principles...

...Christian Widmer; Thomas Staubli; Nathan Ledergerber Reversible pump-turbines are versatile in the electricity market since they can be switched between pump and turbine operation within a few minutes. The emphasis on the design of the more sensitive pump flow however often leads to stability...

...Ali Benhmidene; Bechir Chaouachi; Mahmoud Bourouis; Slimane Gabsi In the present study, the ammonia-water mixing flow in a bubble pump is numerically simulated. The flow patterns of a two-phase flow in a bubble pump were studied under different conditions of heat flux and tube diameter. A one...

...Jesús Manuel Fernández Oro; José González; Katia M. Argüelles Díaz; Francisco Israel Guerras Colón Modern designs for centrifugal pumps consider flow unsteadiness as a main concern. The averaged impact of blade to blade structures and impeller-tongue or impeller-diffuser interactions is considered...

...H. Ding; F. C. Visser; Y. Jiang; M. Furmanczyk Due to complexities in geometry and physics, computational fluid dynamics (CFD) pump simulation has historically been very challenging and time consuming, especially for cases with cavitation. However, with the evolution and innovation of CFD...

...Soo-Yong Cho; Chong-Hyun Cho; Kook-Young Ahn; Young-Cheol Kim The partial admission technique is widely used to control the output power of turbines. In some cases, it has more merits than full admission. However, additional losses, such as expansion, mixing, or pumping, are generated in partial...

...Zhifeng Li; Dazhuan Wu; Leqin Wang; Bin Huang Computational fluid dynamics were used to study the three-dimensional unsteady incompressible viscous flows in a centrifugal pump during rapid starting period (≈0.12 s). The rotational speed variation of the field around the impeller was realized...

...Shu Wang This paper discusses and analyzes the control volume of a piston bore constrained by the valve plate in axial piston pumps. The vacuum within the piston bore caused by the rise volume needs to be compensated by the flow; otherwise, the low pressure may cause the cavitations and aerations...