Effect of the rotor-blade: Armature-vane ratio on the pressure pulse level in a centrifugal pump stage

1979 ◽  
Vol 15 (6) ◽  
pp. 420-422
Author(s):  
N. I. Zubarev ◽  
S. G. Sapunov
Keyword(s):  
Centrifugal Pump ◽  
Rotor Blade ◽  
Pressure Pulse ◽  
Pump Stage

scholarly journals Development and research of a borehole centrifugal pump stage

2020 ◽  
Vol 779 ◽  
pp. 012055
Author(s):  
V Cheremushkin ◽  
V Lomakin ◽  
N Kalin ◽  
A Trulev
Keyword(s):  
Centrifugal Pump ◽  
Pump Stage

Investigation of a Centrifugal Pump Stage With Radial Impeller and a Pump Stage With Small Stage Diameter

2006 ◽  
Author(s):  
Andreas Weiten ◽  
Dieter-H. Hellmann
Keyword(s):  
Centrifugal Pump ◽  
Dynamic Performance ◽  
Axial Direction ◽  
Outer Diameter ◽  
Centrifugal Pumps ◽  
Axial Thrust ◽  
Vaned Diffuser ◽  
Pump Stage ◽  
Radial Pump ◽  
Inner Diameter

For radial multistage centrifugal pumps a combination of a radial exiting impeller, a vaned diffuser and a row of return guide vanes is used for each stage of the pump. Hence the inner diameter of the stage casing is much larger than the diameter of the impeller. In case when the space for installing the pump is limited, for example in case of submersible pumps, a high number of pump stages is necessary to produce a sufficient hydraulic head. Pump stages with an impeller diameter equal to the inner diameter of the casing can reduce the number of the stages, but up to now the efficiency of such pumps is lower than the one of a conventional pump. Improving the design of these pumps in order to increase efficiency, stationary diffusers were developed at the Institute for Turbomachinery and Fluid mechanics at TU Kaiserslautern. While the pump liquid cannot exit the impeller in radial direction, the hub diameter is reduced by the width of the impeller at the outer diameter. Hence the pump liquid now exits the impeller in axial direction. This design affects both the hydraulic and the rotor dynamic performance of the pump. Furthermore the axial thrust has dropped, because the flow and the allocation of static pressure in the impeller side spaces has changes compared to radial pump stages. In this paper results of measurements of vibration and axial thrust at radial centrifugal pump with four stages are compared with these of a four stage pump with small stage diameter. Furthermore the hydraulic datas of both designs a presented.

scholarly journals ESTIMATIVA DO DESGASTES DAS PÁS DO ROTOR DE BOMBA CENTRÍFUGA, DECORRENTE DA ABRASÃO DE SEDIMENTO: ESTUDO DE CASO DE ROTORES FABRICADOS EM AÇO SAE 8620 / ESTIMATION OF CENTRIFUGAL PUMP ROTOR BLADE WEAR DUE TO SEDIMENT ABRASION: CASE STUDY OF STEEL MADE ROTORS SAE 8620

2020 ◽  
Vol 6 (12) ◽  
pp. 95838-95852
Author(s):  
Rodrigo Otávio Peréa Serrano ◽  
Ana Leticia Pliz de Castro ◽  
José Genivaldo do Vale Moreira ◽  
Anderson Azevedo Mesquita ◽  
Edwin Andrés Mancilla Rico ◽  
...  
Keyword(s):  
Centrifugal Pump ◽  
Rotor Blade ◽  
Pump Rotor

scholarly journals Particle Distribution and Motion in Six-Stage Centrifugal Pump by Means of Slurry Experiment and CFD-DEM Simulation

2021 ◽  
Vol 9 (7) ◽  
pp. 716
Author(s):  
Liwen Deng ◽  
Qiong Hu ◽  
Jun Chen ◽  
Yajuan Kang ◽  
Shaojun Liu
Keyword(s):  
Centrifugal Pump ◽  
Simulation Method ◽  
Test Site ◽  
Centrifugal Pumps ◽  
Mining System ◽  
Transport Characteristic ◽  
Dem Simulation ◽  
Multi Stage ◽  
Pump Stage ◽  
Slurry Transport

Six-stage centrifugal pumps are used in deep-sea mining lifting systems and are required to convey slurry containing coarse particles. A six-stage centrifugal pump suitable for operation in a natural mining system was manufactured. High-flow and full-scaled slurry conveying experiments at a 5% and 9% volume concentration of particles was carried out at a large modified test site with artificial nodules. CFD-DEM simulations were carried out to obtain slurry transport characteristic curves, particle transport and distribution characteristics, where the simulation method was validated by the experiment data. A clarified two-stage pump can be used instead of a multi-stage pump for simplified simulation calculations with acceptable accuracy. Local agglomeration of particles caused by backflow was found at the outlet of the diffuser, and such agglomeration decreased with increasing flow rates. It was found that particles are transported non-uniformly, particles transport in diffusers in strands. Particles are transported in a pulse-like mode within the pump, with the latter stage showing similar particle characteristics to those transported in the previous pump stage.

Transient Analysis of an Experimental Mercury Flow Loop for SNS Validation

2005 ◽  
Author(s):  
Nathan P. DeLauder ◽  
Arthur E. Ruggles ◽  
Bernard W. Riemer ◽  
Thomas W. Burgess
Keyword(s):  
Centrifugal Pump ◽  
Computer Model ◽  
Transient Analysis ◽  
Pressure Pulse ◽  
Volumetric Flow Rate ◽  
Operating Conditions ◽  
Flow Loop ◽  
Pump Speed ◽  
Fluid Transient ◽  
Transient Events

A transient fluid acoustic model is compared with experimental data obtained from induced pump trips in a mercury loop. The facility consists of a stainless steel loop filled with 19,000 kg (21 tons) of mercury that is motivated by a 41 KW (55 hp) centrifugal pump through 37 m of piping in a full transit. At nominal operation, the volumetric flow rate from the pump discharge is 1400 LPM and velocities throughout the loop range from 0.3 to 3 m/s. A computer model of the mercury loop was made using the fluid transient code from Applied Flow Technology Impulse™. Loss of power to the mercury centrifugal pump may lead to fluidhammer, in which a cavity formed in low pressure regions created downstream of the pump outlet after the pump power is lost, collapses and gives rise to a pressure pulse. Fluidhammer has been created experimentally through a series of induced trips of the mercury centrifugal pump. Pump speed, volumetric flow rates, and dynamic pressures were gathered during the transient events. This data has provided information about the initialization, magnitude, and propagation of the pressure pulses associated with fluidhammer. The data gathered from these tests is presented and compared to simulation results gained from the computer model. Pressure magnitudes found in trip simulations at normal operating conditions nearly match those found in experiments, and other trends of the time traces show reasonable agreement.

Numerical Investigation of the Transient Flow in a Centrifugal Pump Stage

2005 ◽  
Author(s):  
F.-K. Benra ◽  
H. J. Dohmen
Keyword(s):  
Numerical Investigation ◽  
Centrifugal Pump ◽  
Transient Flow ◽  
Flow Behavior ◽  
Centrifugal Pumps ◽  
Flow Parameters ◽  
Pump Stage ◽  
Dependent Flow ◽  
Return Channel ◽  
Grid Nodes

The knowledge of the flow behavior in pump stages which consist of an impeller, a bladed diffuser and a bladed return channel is of great importance for the design of multistage centrifugal pumps. Especially the Interaction of the impeller flow with the stationary diffuser blades and the behavior of the return channel blades affect the efficiency of a pump stage in a considerable way. In this contribution the transient flow in an industrial centrifugal pump stage, which has an impeller with seven blades, a radial diffuser with ten blades and a return channel with also ten separate blades, has been simulated numerical by using the commercial software code CFX-5.7. Because of the unfavorable ratio of blade numbers a complete meshing of all flow channels was necessary. In consequence the cumulative amount of grid nodes reached a number of nearly 6 million nodes. As a result of the numerical investigation of the time dependent flow accomplished for this contribution, the influence of the rotating impeller on the flow in the stationary parts of the pump is presented in detail. All flow parameters are shown as a function of time and are discussed with respect to the position of the impeller relative to the stator blades.

scholarly journals Experimental Investigation of Flow Instabilities and Rotating Stall in a High-Energy Centrifugal Pump Stage

2009 ◽  
Author(s):  
Stefan Berten ◽  
Philippe Dupont ◽  
Laurent Fabre ◽  
Maher Kayal ◽  
Francois Avellan ◽  
...  
Keyword(s):  
Centrifugal Pump ◽  
Pressure Fluctuation ◽  
Rotational Speed ◽  
Pressure Fluctuations ◽  
Pressure Sensors ◽  
High Energy ◽  
Operating Conditions ◽  
Centrifugal Pumps ◽  
Impeller Blade ◽  
Pump Stage

In centrifugal pumps, the interaction between the rotating impeller and the stationary diffuser generates specific pressure fluctuation patterns. When the pump is operated at off design conditions, these pressure fluctuations increase. The resulting rise of mechanical vibration levels may negatively affect the operational performance and the life span of mechanical components. This paper presents detailed pressure fluctuation measurements performed in a high speed centrifugal pump stage at full scale at various operating conditions. The impeller and stationary part (diffuser, exit chamber) of the pump stage have been equipped with piezoresistive miniature pressure sensors. The measured data in the impeller have been acquired using a newly developed onboard data acquisition system, designed for rotational speeds up to 6000 rpm. The measurements have been performed synchronously in the rotating and stationary domains. The analysis of pressure fluctuations at the impeller blade trailing edge, which had significantly larger amplitudes as the pressure fluctuations in the stationary domain, allowed the detection and exploration of stalled channels in the vaned diffuser. This stall may be stationary or rotating with different rotational speeds and number of stalled channels, depending on the relative flow rate and the rotational speed of the pump. The stall yields pressure fluctuations at frequencies which are multiples of the rotational speed of the impeller and generates additional sources of mechanical excitation.

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