Sensitivity analysis of a Venturi shaped structure for cross-flow turbines

Tidal energy is one of the world's most predicable renewable sources and therefore holds great potential to be a valuable building block for decarbonisation electricity production. This paper focuses on Venturi shaped duct structure (shroud) accelerate flow speed at vertical axis tidal turbine utilising low static pressure created exit shroud. concept known as Davidson Hill (DHV) turbine. By constructing nozzle diffusor using hydrofoils, initial demonstrations indicate increased system efficiency. However, owing number geometric structural hydrofoil variations, only general description location hydrofoils provided in order facilitate modelling while allowing future variations devised. The conducted investigations focus influence sections main geometry identifying length component orthogonal direction dominant parameter. multiple combinations these variables it clear that higher fluid velocities result larger forces which must supported by devices structure. Small adjustments reference geometries placement spacing improvements flow. Thus, taking slight alteration this papers outcome, further 3D-simulation study, including interaction rotation, completed fully characterise systems benefits. insights gained from work will allow reduction computational costs detailed optimisation study into adaption wide range (environmental) boundary conditions.