Mechanical Solutions, Inc. (MSI) was contracted to perform several CFD analyses of an axial hydroturbine, with the purpose of validating the experimental data obtained by a hydroturbine test loop. MSI employed two CFD codes, ANSYS CFX and STAR-CCM+, which were used to conduct several transient analyses, three of which are detailed in this paper. The results of the transient analyses revealed good correlation between the numerical predictions and the experimental data.
This classic Sound & Vibration article explains the basis for when and how to use of an interference diagram in assessing the potential for resonance problems in a centrifugal impeller or axial-bladed disk.
The objective is to utilize modern Finite Element Analysis (FEA) techniques to avoid installing equipment with preventable vibration problems. The methodology is applicable for new plant construction or for plant modifications such as upgrading to more efficient motors or installing Variable Frequency Drives (VFD).
Turbines need to run at very high temperatures to reduce fuel burn, but they require internal cooling to maintain structural integrity and meet service-life requirements. Engineers used simulation to evaluate state-of-the-art turbine-blade cooling-channel geometries and developed an innovative geometry that outperforms existing designs.
This Sound and Vibration article explains the benefit of modal evaluation while the machine is running, and provides a real world example of how MSI does it. An electric power generating plant located in the Northeastern U.S. had suffered through chronic boiler feed pump failures for eight years due to modulated-load operation. Rather than replacing the rotor element with a new, custom design, MSI got to the bottom of the real problem.
In this Institute of Physics Journal of Physics article, the authors compare analytical computational fluid dynamics (CFD) results to experimental results. Numerical predictions of the Francis-99 hydroturbine using the commercial CFD code STAR-CCM+ correlate well with experiment. Net head, discharge, runner torque and hydraulic efficiency all correlate closely with experimentally observed values. Nearly all quantities are predicted within 3.5% of the experimental observation.
Interested in accurately predicting unstable modes in pumps using unsteady, multiphase computational fluid dynamics (CFD)? This a great article by MSI’s Edward Bennett and Artem Ivashchenko on the power of…
As new commercial applications arise for supercritical CO₂ (sCO₂) power generation, and higher output and efficiencies are achieved through higher turbine inlet pressures and temperatures, the need to improve component technologies becomes essential. Traditionally lubricated and cooled oil bearings cannot tolerate the higher temperatures, and the higher pressures make keeping the oil separate from the working fluid an increasingly difficult challenge.
Engineers have been making use of the Interference Diagram as a tool for assessing potential for impeller structural resonance for decades now. It is also referred to in the literature…
This tutorial outlines the basics of pump rotordynamics in a form that is intended to be Machinery End-User friendly. Pump rotordynamic problems, including the bearing and seal failure problems that they may cause, are responsible for a significant amount of the maintenance budget and lost-opportunity cost at many refineries and electric utilities.
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