Pumps

Transient analysis of the Francis-99 hydroturbine

Simulation of the Francis-99 hydroturbine is presented with correlation to experimental data. The virtual model of the hydroturbine accurately models the unsteady nature of the flow-field at the best operating point (BEP), part load (PL) and high load (HL) conditions. Global predictions such as efficiency, net head and discharge correlate well with experiment. Additionally, local velocity profiles in the runner agree well with experimental PIV measurements. Vortex rope characteristics are discussed for each of the operating points.

Numerical modeling of twin-screw pumps using CFD

Increasing demands for high-performance screw pumps in oil and gas as well as other applications require deep understanding of the fluid flow inside the machine. Important effects on the performance such as dynamic losses, influence of the leakage gaps, presence and extent of cavitation are difficult to observe by experiments. However, it is possible to study such effects using well validated computational fluid dynamics (CFD) models.

Numerical investigation of a non-Newtonian pump

In this work a reverse engineering (RE) procedure and a comparative CFD analysis using different software are presented. The three-dimensional flow in the semi-open impeller and volute of a centrifugal pump has been numerically simulated. This kind of impeller is less likely to clog with solid bodies (this is an important aspect in the case of slurry-processing) and for this reason is suitable for food, chemical and Oil & Gas industries. It is well known that the performance of a centrifugal pump drops when handling viscous fluids.

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