Abstract
In this study the impeller geometry of a double-suction pump ensuring the best performances in terms of hydraulic efficiency and reluctance of cavitation is determined using an optimization strategy, which was driven by means of the modeFRONTIER optimization platform. The different impeller shapes (designs) are modified according to the optimization parameters and tested with a computational fluid dynamics (CFD) software, namely ANSYS CFX. The simulations are performed using a decoupled approach, where only the impeller domain region is numerically investigated for computational convenience. The flow losses in the volute are estimated on the base of the velocity distribution at the impeller outlet. The best designs are then validated considering the computationally more expensive full geometry CFD model. The overall results show that the proposed approach is suitable for quick impeller shape optimization.
Highlights
Centrifugal pumps are widely used in industrial applications
Numerical procedure The geometry of the double-suction centrifugal pump is presented in figure 1
Instead of using the fullgeometry model, the optimization was performed for a decoupled model
Summary
Centrifugal pumps are widely used in industrial applications. Double-suction ( called: doubleentry) centrifugal pumps allow transportation of greater flow rates than single-entry pumps [1] because they are less prone to cavitation problems (smaller NPSHR, required net positive suction head). The validation of the method was performed, for the most promising design candidates, by using a full geometry coupled method, considering the suction chambers, full impeller geometry and the double volute. Before performing the decoupled optimization, the coupled CFD simulation was performed, to obtain the velocity distribution at the impeller inlet.
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