Movements of solid particles in a radial-flow pump impeller. (2nd report Behavior of a three-dimensional potential flow field)

Equations of motion of solid particles in a pump impeller having a low specific speed were solved numerically in the flow field obtained with assumptions of an inviscid and incompressible three-dimensional potential flow, and general movements of solid particles in the pump were clarified. Trajectories of the sand particles and manganese ores, with diameters ranging from 1 to 5 mm, were obtained for different flow capacities. The positions and velocities with which the particles impact on the boundary surface of the pump were also discussed in order to estimate erosion damage in pumps.

Download Full-text

Numerical Investigation of Velocity Flow Field inside an Impeller Air Model of a Centrifugal Pump with Vaned Diffuser Interactions and Comparison with PIV Measurements

International Journal of Rotating Machinery ◽

10.1155/2010/706043 ◽

2010 ◽

Vol 2010 ◽

pp. 1-12 ◽

Cited By ~ 3

Author(s):

Abdelmadjid Atif ◽

Saad Benmansour ◽

Gerard Bois

Keyword(s):

Numerical Simulation ◽

Flow Field ◽

Radial Flow ◽

Operating Conditions ◽

Impeller Blade ◽

Vaned Diffuser ◽

Piv Measurements ◽

Velocity Flow ◽

Radial Flow Pump ◽

Flow Pump

The paper refers to the analysis of interactions between the impeller and the vaned diffuser on the air model of a radial flow pump. The study deals with a numerical simulation of the flow for a full 360°entire impeller and diffuser. The task is carried out close to design operating conditions and for one particular position of the impeller blade with respect to diffuser frame. Among all the results, it has been decided to mainly focus on the flow pattern at the exit part inside the impeller coming from the diffuser vanes interactions. The results are compared to the available PIV measurements.

Download Full-text

Transient Behavior of Turbomachineries: Applications to Radial Flow Pump Startups

Journal of Fluids Engineering ◽

10.1115/1.2776963 ◽

2007 ◽

Vol 129 (11) ◽

pp. 1436-1444 ◽

Cited By ~ 37

Author(s):

Antoine Dazin ◽

Guy Caignaert ◽

Gérard Bois

Keyword(s):

Theoretical Analysis ◽

Radial Flow ◽

Transient Behavior ◽

Incompressible Fluids ◽

Pump Impeller ◽

Acceleration Rate ◽

Fluids Mechanics ◽

Fast Transients ◽

Radial Flow Pump ◽

Flow Pump

A theoretical analysis of the fast transients of turbomachineries, based on the study of unsteady and incompressible fluids mechanics equations applied to an impeller, is proposed. It leads to internal torque, internal power, and impeller head of an impeller during transient periods. The equations show that the behavior of a pump impeller is not only depending on the acceleration rate and flow rate, as it is usually admitted, but also on velocity profiles and their evolution during the transient. Some hypotheses on the flow in a radial flow pump are proposed. They are validated by comparison with the experimental results of a single stage, single volute radial flow pump during some fast acceleration periods. The model is also used to analyze the behavior of the pump during a fast startup.

Download Full-text

Suppression of Secondary Flows in a Mixed-Flow Pump Impeller by Application of Three-Dimensional Inverse Design Method: Part 1—Design and Numerical Validation

Journal of Turbomachinery ◽

10.1115/1.2836700 ◽

1996 ◽

Vol 118 (3) ◽

pp. 536-543 ◽

Cited By ~ 42

Author(s):

M. Zangeneh ◽

A. Goto ◽

T. Takemura

Keyword(s):

Flow Field ◽

Design Method ◽

Three Dimensional ◽

Secondary Flows ◽

Inverse Design ◽

Suction Surface ◽

Mixed Flow ◽

Pump Impeller ◽

Inverse Design Method ◽

Flow Pump

This paper describes the design of the blade geometry of a medium specific speed mixed flow pump impeller by using a three-dimensional inverse design method in which the blade circulation (or rVθ) is specified. The design objective is the reduction of impeller exit flow nonuniformity by reducing the secondary flows on the blade suction surface. The paper describes in detail the aerodynamic criteria used for the suppression of secondary flows with reference to the loading distribution and blade stacking condition used in the design. The flow through the designed impeller is computed by Dawes’ viscous code, which indicates that the secondary flows are well suppressed on the suction surface. Comparison between the predicted exit flow field of the inverse designed impeller and a corresponding conventional impeller indicates that the suppression of secondary flows has resulted in substantial improvement in the exit flow field. Experimental comparison of the flow fields inside and at exit from the conventional and the inverse designed impeller is made in Part 2 of the paper.

Download Full-text