Journal of Fluids Engineering · 2002 · 56 citations · 6 references
EngineeringChemical EngineeringFluid DynamicsHydraulic EngineeringHydraulicsFlow MeasurementHydraulic Pumping SystemsLaser Doppler MetrologyLaser Doppler VelocimetryMulti-stage PumpsMultistage DesignNumerical Flow ModelingNumerical Flow SimulationPump DesignPumps
The study focuses on pump designs with all impellers in series, applicable to barrel casing and segmental types. The paper presents axial thrust problems in multistage pumps. Experimental one‑stage tests using Laser Doppler Anemometry measured fluid rotation in the impeller side chamber, while numerical flow analysis verified the results. Fluid rotation in side chambers was shown to affect hydraulic axial thrust across leakage flow regimes, and increased wear‑ring radial clearance was found to influence axial thrust, with solutions proposed to reduce it.
In this paper, axial thrust problems of multistage pumps are presented. The entire investigation has been focused on the pump design concept having all impellers in series (facing in one direction) and is valid for barrel casing type as well as for segmental type. The major part of the investigation has been experimental on one stage testing arrangement, using also Laser Doppler Anemometry (LDA) for determination of fluid rotation in the impeller side chamber. Numerical flow analysis (NFA) has been applied for some flow variants in order to verify whether a numerical approach could simulate the test results. The phenomenon of fluid rotation in side chambers and its effect on impeller hydraulic axial thrust have been determined for different leakage flow regimes. The influence of increased wear ring radial clearance on axial thrust has been analyzed together with the solutions for pump hydraulic axial thrust reduction.
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Centrifugal and axial flow pumps
H.N. Michael · Journal of the Franklin Institute · 1948 · 414 citations