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HL 2016 09 30

This literature review aims to identify guidelines for designing hydraulic facilities to prevent vortex formation, revealing that existing knowledge is limited and often outdated. Current research focuses on site-specific vortex issues rather than developing general guidance, and there are gaps in understanding the impact of vortices on turbine efficiency. Future studies are suggested to address these gaps and investigate vortex suppression methods in existing projects.

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neerajkumar.rs.mec23
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6 views1 page

HL 2016 09 30

This literature review aims to identify guidelines for designing hydraulic facilities to prevent vortex formation, revealing that existing knowledge is limited and often outdated. Current research focuses on site-specific vortex issues rather than developing general guidance, and there are gaps in understanding the impact of vortices on turbine efficiency. Future studies are suggested to address these gaps and investigate vortex suppression methods in existing projects.

Uploaded by

neerajkumar.rs.mec23
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PDF, TXT or read online on Scribd
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Summary

One of the goals of this literature review was to determine if there are any
generally applicable guidelines for design of hydraulic facilities to ensure against
vortex formation. With only a small area of what was considered safe against
vortex formation in Figure 3, there is almost no guarantee that any specific facility
will not encounter vortex formation. Unless the design is able to follow well
established guidelines, a physical model study may be the only way to determine
if a vortex will form. This may also be the case for existing projects that are
operated below the design WSE due to drought or other circumstances.

While a majority of the research questions for this scoping level study found a
large quantity of published reports and scale physical model studies, much of this
information is up to 50 years old. Current studies with vortex problems are
typically designed to solve a site specific problem and are not research based to
develop general guidance to avoid vortices at other facilities. It appears that the
trend in current vortex research is for the vortex shape profile and include
development of empirical equations to define the core shape, radius, surface
depression depth, tip depth and other parameters. Furthermore, the data that is
presented on the shape characteristics is caveated that it may not be broadly
applicable to other models or prototypes.

There were also a few research questions that were not well addressed in the
available literature. Topics that could be considered for future study are changes
to turbine efficiency with a vortex being present and changes to the turbine
efficiency or head loss with vortex suppression devices. In addition to potential
laboratory research projects, of the selected Bureau of Reclamation projects that
were interviewed, 3 currently have intermittent vortex occurrence that have not
been studied or attempted to mitigate with vortex suppression. One of these is due
to obstruction of the trash rack leading to localized high velocities, but the other
two are unknown. Of the 7 projects that were interviewed, 3 had intermittent
vortices formed, and 1 project would have had a vortex issue if it had not been for
a physical model study during the design phase.

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