Theoretical Analysis of Flow Through Two-Dimensional Centrifugal Pump Impeller by Method of Singularities

1971 ◽  
Vol 93 (1) ◽  
pp. 35-40 ◽  
Author(s):  
S. K. Ayyubi ◽  
Y. V. N. Rao
Keyword(s):  
Centrifugal Pump ◽  
Operating Conditions ◽  
Two Dimensional ◽  
Pump Impeller ◽  
Pump Operation ◽  
Wide Range ◽  
Hydrodynamic Method ◽  
Flow Through ◽  
Experimental Values ◽  
Centrifugal Pump Impeller

The hydrodynamic method of singularities is used to analyze the flow through two-dimensional centrifugal pump impellers with blades of an arbitrary geometry. Computed values of ideal head are compared with experimental values obtained for a commercial pump. The agreement between theory and experiment is very close over a wide range of pump operation. The discrepancies that occur at other operating conditions are attributed to the effects of inlet passage and volute casing.

Theoretical Investigation of Pressure Distributions Along the Surfaces of a Thin Blade of Arbitrary Geometry of a Two-Dimensional Centrifugal Pump Impeller

1977 ◽  
Vol 99 (3) ◽  
pp. 531-539 ◽  
Author(s):  
T. C. Mohana Kumar ◽  
Y. V. N. Rao
Keyword(s):  
Centrifugal Pump ◽  
Numerical Procedure ◽  
Two Dimensional ◽  
Arbitrary Geometry ◽  
Pump Impeller ◽  
Pressure Distributions ◽  
Blade Thickness ◽  
Hydrodynamic Method ◽  
Flow Through ◽  
Centrifugal Pump Impeller

The flow through a two-dimensional centrifugal pump impeller with thin blades of arbitrary geometry is investigated using the hydrodynamic method of singularities. A theoretical analysis is developed to determine the impeller head and pressure distributions along the blade surfaces. The convergence of the numerical procedure is discussed. These results are compared with the theoretical and experimental results reported by Acosta. There is excellent agreement between the theoretical values of the impeller head and the pressure distributions obtained by both methods. Discrepancies in the theoretical and experimental pressure distributions are attributed to the effects of viscosity, inlet turn, blade thickness and inlet stall which are neglected in the analysis.

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.

Quasi Two-Dimensional Analysis of Flow Through a Centrifugal Pump Impeller

1977 ◽  
Vol 99 (4) ◽  
pp. 687-692 ◽  
Author(s):  
T. C. Mohana Kumar ◽  
Y. V. N. Rao
Keyword(s):  
Centrifugal Pump ◽  
Dimensional Analysis ◽  
Two Dimensional ◽  
Empirical Methods ◽  
Pump Impeller ◽  
Flow Through ◽  
Centrifugal Pump Impeller

A quasi two-dimensional method of singularities is developed for the analysis of flow through a centrifugal pump impeller of varying width. The theory is applied to a double suction centrifugal pump impeller and the results are compared with those obtained by existing two-dimensional and empirical methods. The suggested analysis gives satisfactory results at regimes close to the best efficiency point.

Performance Study of a Mixed Flow Impeller Covering an Unsteady Flow Field

1992 ◽  
Vol 206 (2) ◽  
pp. 83-93 ◽  
Author(s):  
S Sarkar
Keyword(s):  
Axial Flow ◽  
Rotating Stall ◽  
Operating Conditions ◽  
Performance Study ◽  
Mixed Flow ◽  
Pump Impeller ◽  
Wide Range ◽  
Reversal Flow ◽  
Flow Through ◽  
Flow Pump

The results presented here are part of a detailed programme measuring the aerodynamics of a high specific speed mixed flow pump impeller over a wide range of operating conditions, including its behaviour in the unsteady stalled regime. The aim is to elucidate the physics of the flow through such an impeller. The noticeable features are the formation of part-span rotating stall cells having no periodicity and organized structure at reduced flow and also the shifting positions of reversal flow pockets as the flowrate changes. Measurements of loss and its variation with span-wise positions and flowrates enable the variation of local efficiency to be determined. The overall flow picture is similar to that expected in an axial flow impeller, though the present impeller displays a narrow stall hysteresis loop almost right through its operating range.

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