Turning the tide on alternative energy.
Technology
From an understanding of fluid flow mechanics over solid surfaces and the lift and drag effects well known in aerodynamics, we have developed highly efficient designs for energy conversion from fluid flow. The designs are particularly appropriate for tidal energy extraction as the flow is transverse to the rotation axis and the turbine can therefore be operated in shallow waters without restriction on total power.
High efficiency arises from utilisation of both lift and drag in an optimal combination with respect to the scale and flow conditions. Turbines that utilise both lift and drag are by definition more efficiant than propellor type designs. Modelling so far carried out in conjunction with an early experimental prototype indicates that the design basis is capable of efficient conversion and is compatibile with a low cost infrastructure. Both these factors are critical to achieving a commercially competitive solution with early payback.
These novel turbine designs and configurations are subject to ongoing patent protection.
The ability to utilise both drag and lift characteristics is key to achieving high conversion efficiency particularly at low flow velocities of less than 2 m/s. Current research is focused on optimisation of the drag-lift contributions both from computational fluid dynamic (CFD) modelling and small scale experimental prototypes.
The early experimental trials with a small scale prototype using a wind tunnel confirm predicted power extraction efficiency variation with increasing applied load. Water flow trials are underway to demonstrate comparative power extraction efficiency with substantially greater powers.
Additional efficiency gains are being explored by CFD modeling and experimental comparison for a number of design parameters.
The turbine is positioned in the best flow stream by anchoring and cabling. The anchoring system is engineered to withstand the high forces (tons) due to the change in stream velocity resulting from energy extraction and is resilient to changes in flow velocity and direction. Cost-efficient fabrication techniques and marine compatible materials allow both the long term reliability and initial cost objective to be met. A framed construction also allows the turbine to be shielded from marine life.
Further imformation is available under a non-disclosure agreement.
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