Energy

Improving fan efficiency with design exploration

Turbomachinery forms an essential part of many mechanical equipment systems and accounts for a significant portion of global industrial energy usage. Not surprisingly then, engineers are constantly searching for innovative ways to increase the efficiency of these power transmission devices.

This presentation illustrates a new and completely automated workflow for discovering better turbomachinery designs faster through the combined use of three best-in-class engineering design & simulation software products: TURBOdesign 1 (TD1) STAR-CCM+ and HEEDS.

Specifically:

Coal to biomass (wood pellets) mill conversion

To convert a pulverised fuel (suspended) boiler into one that burns biomass, one modification required, is on the coal mills/pulverisers. Existing attempts, such as using an existing coal classifier with blocked off areas for increased throughput, seems to not be the solution. With biomass, the flakes (broken pellets) will react differently to the air due to a flake having a very low density, therefore conventional classifiers will over classify the flakes causing a reduced throughput to the boiler.

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.

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