| CPC B64C 23/06 (2013.01) [B63H 5/16 (2013.01); B64C 21/08 (2013.01); F15D 1/0015 (2013.01); F15D 1/0065 (2013.01); F15D 1/007 (2013.01); B64C 2230/04 (2013.01); B64C 2230/14 (2013.01)] | 19 Claims |

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1. An arrangement for influencing a liquid flow, the arrangement comprising:
a first section selectively configurable to provide a vortex generator surface to induce vortices in the liquid flow; and
a second section downstream of the first section and the vortex generator surface,
wherein the first section and second section are movable relative to one another to provide the vortex generator surface to induce vortices in the liquid flow.
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