Physical Modelling of the Set of Performance Curves for Radial Centrifugal Pumps to Determine the Flow Rate

Abstract

To depict the pump power characteristics of radial centrifugal pumps, a physical model was developed. The model relies on established empirical equations. To parameterize the model for specific pumps, physically interpretable tuning factors were integrated. The tuning factors are identified by using the Levenberg–Marquardt method, which was applied to the characteristic curve at a constant speed. A cross-validation of the physical model highlighted the advantage of representing the set of performance curves with less deviation compared to approximation functions. Calculating the entire set of performance curves requires only one pump characteristic curve at a constant speed. Therefore, only a single measurement is necessary. Furthermore, the physical model can be used to calculate the changes in the set of performance curves due to prewhirl. This increases the accuracy of flow rate calculations when prewhirl occurs.

Soft Sensor Technology for the Determination of Mechanical Seal Friction Power Performance

“…They showed that changing the pump speed over a wide range results in significant differences between the calculated and observed pump curve. We included the mechanical power loss of the pump in a physical model for determining the set of performance curves for radial centrifugal pumps [4]. As a result, the prediction of the pump characteristic curves at a reduced pump speed was considerably improved compared to that under the affinity laws.…”