scholarly journals Some Unsteady Fluid Forces on Pump Impellers

1992 ◽  
Vol 114 (4) ◽  
pp. 632-637 ◽  
Author(s):  
R. S. Miskovish ◽  
C. E. Brennen
Keyword(s):  
Fluid Flow ◽  
Centrifugal Pump ◽  
Bending Moments ◽  
Pump Impeller ◽  
Spectral Analyses ◽  
Fluid Forces ◽  
Radial Forces ◽  
Unsteady Fluid ◽  
Rotordynamic Forces ◽  
Centrifugal Pump Impeller

Spectral analyses of all the forces and moments acting on a typical centrifugal pump impeller/volute combination are presented. These exhibit shaft frequencies, blade passing frequencies, and beat frequencies associated with a whirl motion imposed on the shaft in order to measure rotordynamic forces. Among other features the unsteady thrust was found to contain a surprisingly large blade passing harmonic. While previous studies have explored the magnitudes of the steady fluid-induced radial forces and the fluid-induced rotordynamic forces for this typical centrifugal pump impeller/volute combination, this paper presents information on the steady bending moments and rotordynamic moments due to the fluid flow. These imply certain axial locations for the lines of action of the radial and rotordynamic forces. Data on the lines of action are presented and allow inferences on the sources of the forces.

scholarly journals Analyses of Hydrodynamic Radial Forces on Centrifugal Pump Impellers

1988 ◽  
Vol 110 (1) ◽  
pp. 20-28 ◽  
Author(s):  
D. R. Adkins ◽  
C. E. Brennen
Keyword(s):  
Theoretical Model ◽  
Centrifugal Pump ◽  
Substantial Effect ◽  
Operating Conditions ◽  
Pump Impeller ◽  
Pressure Distributions ◽  
Flow Disturbances ◽  
Radial Forces ◽  
Flow Through ◽  
Centrifugal Pump Impeller

Hydrodynamic interactions that occur between a centrifugal pump impeller and a volute are experimentally and theoretically investigated. The theoretical analysis considers the inability of the blades to perfectly guide the flow through the impeller, and also includes a quasi-one dimensional treatment of flow in the volute. Flow disturbances at the impeller discharge and the resulting forces are determined by the theoretical model. The model is then extended to obtain the hydrodynamic force perturbations that are caused by the impeller whirling eccentrically in the volute. Under many operating conditions, these force perturbations were found to be destabilizing. Comparisons are made between the theoretical model and the experimental measurements of pressure distributions and radial forces on the impeller. The theoretical model yields fairly accurate predictions of the radial forces caused by the flow through the impeller. However, it was found that the pressure acting on the front shroud of the impeller has a substantial effect on the destabilizing hydrodynamic forces.

scholarly journals Analysis of Forced Spatial Vibrations of a Centrifugal Pump Impeller with Axial Forces Balancing Device

2016 ◽  
Vol 21 (3) ◽  
pp. 737-750
Author(s):  
A. Zhulyov ◽  
V. Martsinkovsky ◽  
C. Kundera
Keyword(s):  
Fluid Flow ◽  
Theoretical Analysis ◽  
Centrifugal Pump ◽  
Frequency Characteristics ◽  
Pump Impeller ◽  
Axial Forces ◽  
Seal Assembly ◽  
Axial Vibrations ◽  
Centrifugal Pump Impeller ◽  
Annular Seals

Abstract In this paper, a model of a pump impeller with annular seals and a balancing device, used as a combined support-seal assembly, is considered. The forced coupled radial, angular and axial vibrations of the rotor are determined with consideration of linearized inertial, damping, gyroscopic, positional and circulating forces and moments acting on the impeller from the side of the fluid flow in annular seals. The theoretical analysis is supplemented with a numerical example, the amplitude frequency characteristics are shown.

scholarly journals Experimental and Numerical Investigation of Radial Forces Acting on Centrifugal Pump Impeller

2014 ◽  
Vol 61 (3) ◽  
pp. 445-454 ◽  
Author(s):  
Krzysztof Karaskiewicz ◽  
Marek Szlaga
Keyword(s):  
Centrifugal Pump ◽  
Rectangular Cross Section ◽  
Radial Force ◽  
Axial Thrust ◽  
Pump Impeller ◽  
Ansys Fluent ◽  
Commercial Code ◽  
Radial Forces ◽  
Radial Thrust ◽  
Centrifugal Pump Impeller

Abstract The paper presents the results of measurements and predictions of radial thrust in centrifugal pump with specific speed ns = 26. In the pump tested, a volute with rectangular cross-section was used. The tests were carried out for several rotational speeds, including speeds above and below the nominal one. Commercial code ANSYS Fluent was used for the calculations. Apart from the predictions of the radial force, the calculations of axial thrust were also conducted, and correlation between thrust and the radial force was found. In the range of the measured rotational speeds, similarity of radial forces was checked.

scholarly journals Design and flow simulation for a centrifugal pump with double suction impeller

2018 ◽  
Vol 178 ◽  
pp. 05018
Author(s):  
Eugen-Vlad Năstase
Keyword(s):  
Fluid Flow ◽  
Kinetic Energy ◽  
Centrifugal Pump ◽  
Flow Simulation ◽  
Axial Thrust ◽  
Pump Impeller ◽  
Hydraulic Machine ◽  
Hydrodynamic Energy ◽  
Centrifugal Pump Impeller

Centrifugal pump is a hydraulic machine that is used to transport fluids by the conversion of rotational kinetic energy of impeller into the hydrodynamic energy of the fluid flow. The double-suction centrifugal pump are used for conveyance of a large quantity of water and have wide application due to its stable running, for the balance of axial thrust through by the double suction in impeller, and for a convenient maintenance. Because the design of the centrifugal pump impeller is not a universally standardized one and depends on designer's experience and its technical intuition, in this paper is presented a methodology of design and the fluid flow simulation throughout impeller.

Numerical Optimization of a Centrifugal Pump Impeller with Splitter Blades Running in Reverse Mode

2016 ◽  
Vol 10 (4) ◽  
pp. 215 ◽  
Author(s):  
Ioannis Kassanos ◽  
Marios Chrysovergis ◽  
John Anagnostopoulos ◽  
George Charalampopoulos ◽  
Stamelos Rokas ◽  
...  
Keyword(s):  
Centrifugal Pump ◽  
Numerical Optimization ◽  
Pump Impeller ◽  
Reverse Mode ◽  
Centrifugal Pump Impeller
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