Run-of-River, Marine and Tidal Streams

"Catamaran with two Floats forming a Planar Symmetry Channel with Hydroreactor Profile"

Application:  To be Installed at low depth rivers where nautical traffic is almost inexistent, to profit from run-of-river streams.

Table of Contents:

Description of the Technology



Description of the Technology

This Technology refers to a catamaran for creating a net head that stands anchored at the middle of a river tied to the river sides by means of cables and fixed to the riverbed by means of stakes, composed by two profiled floats connected together with a floor plane that constitutes the floor of a symmetric channel formed between the floats containing a narrower zone of determined width, where water flows with higher strength than the river stream, moving a low head water wheel mounted on both floats that drives electrical generator(s) standing on the float(s), each float containing mounts to sustain a bridge that includes a middle tray between the mounts and two side trays each from one mount to the river side, all together providing means to extract power from run-of-river streams on a higher number profitable sites where the streams could not be very strong, recommended for low depth rivers where marine traffic is almost inexistent and a bridge that can be easily assembled allowing pedestrian or light loadings to cross between river sides.

The inside channel is formed by an inlet converging zone of compression, an intermediate zone of narrower cross section (gorge) where flow loading is significantly higher than the outside free stream loading and finally by an exhaust diverging zone where a suction effect is generated by diffusion of the inside flow and deflection of the outside stream nearby the channel outlet.  

The floats stand attached to each other by a floor plan forming planar symmetry channel with hydroreactor profile being the channel width defined by a quadratic decrease at the inlet converging zone, a minimum constant channel width at the intermediate zone where is the water wheel and an initial accentuated increase and almost null final increase of the channel width at the outlet diverging zone. The distance between the imaginary plane defining the center and the external float surfaces is defined by a soft quadratic increase at the inlet converging zone, and a slight linear decrease with same inclination at intermediate and outlet diverging zones.

A special water wheel with optimized design bucket is used, to get the best performance on low fall streaming flows.

The generated electrical power is transmitted by electrical cables lied on the riverbed to a central station at river side, where electrical power store and conversion is performed.

The general dimensions of the planar symmetry channel of hydroreactor profile are taken with relation to the with wt of the channel at the narrower zone, being: the maximum width between the external surfaces of the floats about 4.5 times higher than wt and the floats length about 7 times higher than wt.


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Representation of the Technology:




1 - Catamaran with hydroreactor profile for creating a net head

2 - Profiled Floats

3 - Floor Blade

4 - Low Head Water Wheel

5 - Selective grid at the channel inlet to avoid entrance objects bigger than a specific size

6 - Electrical Generator


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Experiments have shown that the hydroreactor profile presents an optimized design, corresponding to the most efficient stream accelerator model between the several profiles that have been tested in practice.

The Catamaran forming a channel of hydroreactor profile, will introduce a significant net head generating a flow with much higher loading than the stream, promoting power extraction from run-of-river streams on a higher number of sites/places.

The catamaran does not create any barriers, allowing water to flow on a free way, in contrary of what happens on the case of small dams with creation of small lakes.

The technology is simple and relative ease to install/de-install.


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