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International Journal of Rotating Machinery
Volume 2017 (2017), Article ID 9806278, 10 pages
Research Article

Characterization of Hydraulic Power in Free-Stream Installations

Lehrstuhl für Strömungsmechanik und Strömungstechnik (LSS), Otto-von-Guericke-Universität Magdeburg/ISUT, Universitätsplatz 2, 39106 Magdeburg, Germany

Correspondence should be addressed to Olivier Cleynen

Received 5 January 2017; Revised 6 March 2017; Accepted 23 March 2017; Published 9 May 2017

Academic Editor: Ryoichi Samuel Amano

Copyright © 2017 Olivier Cleynen et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


The performance of open-channel hydropower devices can be optimized by maximizing the product of their load, hydraulic, and generator efficiencies. The maximum hydraulic power theoretically available must be defined according to the operational scenario retained for the device of interest. In the case of a device operating within a wide, unobstructed channel, the existence of a maximum hydraulic power and the operating speed required to reach it are first predicted using a one-dimensional flow model. This model is then extended to account for the effect of device ducting. As a result, given the available surface level drop and a single duct characteristic parameter, the model predicts the optimum device operating speed, whether the duct can improve performance, and the relative duct size which maximizes the installation’s power density, all at a very low computational cost.