Multistage Centrifugal-Pumps: Assessment Of A Mixing
Plane
Method For CFD Analysis
Abstract
An
accurate CFD investigation allows a thorough knowledge of the fluid dynamic
field inside a multistage centrifugal pump but only a correct interpretation of
its results grants a well-founded prediction of the machine performance curves.
The paper introduces the assessment of an improved methodology to predict
head-flow and efficiency characteristics of industrial pumps in real operating
conditions. The described approach is based on standard CFD analysis and
experimental tests.
The
numerical procedure is built-up of three different steps:
· CFD investigation of the single impeller and diffuser domains;
· impeller-diffuser interaction analysis;
· evaluation of the whole multistage pump performance curves by
pressure field
interpretation
and taking into account real machine secondary phenomena. The stage
computational model is made up of two 3D fluid domains with overlapping: one of
them is aimed to simulate the diffuser and is related to a stationary reference
frame while the other one models the impeller and is referred to a rotating
system.
Moreover
the impeller–diffuser interaction is studied by the employment of a mixing
plane technique. Numerical results are then compared to the real pump
performance test at the actual working conditions in order to validate the
proposed methodology.
The
paper will discuss all approach details and the main CFD features involved.
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Multistage Centrifugal-Pumps: Assessment Of A Mixing Plane Method For CFD Analysis
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