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![Figure 1: Optimal operation for hydropower in an open-channel flow [1]....](publication/261016039/figure/fig3/AS:667782135963653@1536223076232/Optimal-operation-for-hydropower-in-an-open-channel-flow-1-The-paper-Upper-Limit-for_Q320.jpg)
Motivated by global warming due to CO2-emission various technologies for harvesting of energy from renewable sources are developed. Hydrokinetic turbines get applied to surface watercourse or tidal flow to gain electrical energy. Since the available power for hydrokinetic turbines is proportional to the projected cross section area, fields of turbi...
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Motivated by global warming due to í µí° ¶í µí± 2-emission various technologies for harvesting of energy from renewable sources are developed. Hydrokinetic turbines get applied to surface watercourse or tidal flow to gain electrical energy. Since the available power for hydrokinetic turbines is proportional to the projected cross section area, fie...
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... A future step will be to change the block profile, which isat the moment -used to determine the upstream undisturbed velocity to a 1/7-power law profile and validate the results through 3d flow simulations. Free surface effects as described in [10] and [11] do not have to be include in the theoretical model, as the position of the water surface is calculated and hence considered by the shallow water solver. It would also be interesting to determine the influence of those effects on the power output. ...
... The removal of condition (1) (full flow obstruction, with the entire stream passing through the device) has been later explored by Pelz and Metzler [13]: a model is then obtained for the performance of channel hydraulic devices installed on the bottom of channels and with lateral flow bypass. ...
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.
