CURVED WALL TRIANGULAR FLUME (CWTF) DESIGN, THEORY, AND EXPERIMENT

B. ACHOUR, G. DE LAPRAY

Abstract


The flumes reported in the specialized literature are mostly designed in a rectangular shape, such as the Parshall or the Venturi, which has several drawbacks, in particular low accuracy for low flow depths. The section that offers the best accuracy for both low and high flow rates is the triangular section on which the measuring device under consideration is based.

The dimensions of the device are well defined based on rigorous geometrical considerations, with the exception of the length of the throat, which has been derived from an in-depth graphical optimization study. To facilitate the calculations, all the dimensions of the device are related to the top width Bo of the approach channel, which is a known parameter for a given installation.

The discharge coefficient relationship Cd is derived using two distinct rational methods: one is based on the energy equation, and the other is based on the properties of the kinetic factor.

The experimental tests were carried out on a specially designed installation involving eight devices that allowed the collection of 1485 experimental values of Cd. The predicted discharge coefficients had excellent agreement with the observations since a maximum deviation of only 0.07% was observed.


Keywords


Flume, Weir, Triangular profile, Discharge, Discharge coefficient, CWTF.

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References


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