An apparatus for controlling fluid flow to turbines

An apparatus for introducing skew to a fluid flow directed on to one or more vertical axis turbines, said vertical axis turbine being one which is driven by fluid flow onto the turbine from a predominantly transverse direction relative to the axis of rotation of the turbine, the apparatus comprising a support structure having mounted thereon a plurality of vertically spaced aerofoils arranged to partially or completely surround the one or more vertical axis turbines, the vertical spacings being selected and the aerofoils being profiled and arranged at an angle such that fluid flow between the aerofoils is skewed at a skew angle of up to +30°, for example from +10° to +30° or −10° to −30° (e.g. a skew angle in the range from +25° to +29°;

• or a skew angle in the range from −25° to −29°), before it is incident upon the one or more vertical axis turbines

An apparatus for introducing skew to a fluid flow directed on to one or more vertical axis turbine, said vertical axis turbine being one which is driven by fluid flow onto the turbine from a predominantly transverse direction relative to the axis of rotation of the turbine, the apparatus comprising a support structure having mounted thereon a plurality of vertically spaced aerofoils arranged to partially or completely surround the one or more vertical axis turbines, the vertical spacings being selected and the aerofoils being profiled and arranged at an angle such that fluid flow is skewed at a skew angle of up to ±30°, for example from +10° to +30° or −10° to −30° (e.g. a skew angle in the range from +25° to +29°;

• or a skew angle in the range from −25° to −29°), as it flows between the aerofoils and remains skewed as it is incident upon the one or more vertical axis turbines.

(canceled)