Jasper Hollander

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I'm doing an internship at HYE to investigate various factors influencing the velocity profile in a suction tube.

This will include a lot of measurements to get a better understanding of how the velocity profile changes over the length of the tube, as well as how it varies with changes in geometry, discharge and other variables.

First two weeks will be mainly literature study, to get an idea of what the problems are with the pump intakes and the models Deltares uses, as well as find out if the velocity profile is studied more closely by other researchers.

In the next weeks I will be doing the experiments in the_ _IOS-2 basin where a pump bay has been prepared. By varying measurement heigth, flow discharge, bottom clearance and water level in turn their influence on the velocity profile at the pump throat will be studied.

This will help us understand how valuable a measurement of the velocity actually is. In the second part of the measurements some flow modifications often used by Deltares will be installed. These include back splitters, bottom splitters and curtain walls. As these modifications are installed to minimize negative effects on pump efficiency by eliminating pre-rotation and sub surface vortices, the influence on the velocity profile is expected to be significant.

Afterwards the results will be analyzed and compared. Hopefully a better understanding can be gained of both the value of the measurements and of the distribution of the velocity by inself.
 Below: This is the setup, with the top of the pump inlet visible in the pump bay.

And a picture of the pump inlet, with the pitot tubes installed.