![]() These tubes speed up the water flow, which makes for a greater power output than a similar sized turbine without a shroud. As seen in Figure 2, a funnel shape is built around or near the turbine that causes the flow rate of the water to increase. ![]() In the case of tidal stream generators, a duct or shroud (otherwise known as a diffuser) can be used to increase the amount of power available. ![]() The energy in this increased speed comes by reducing the static pressure of the fluid. The Venturi effect describes how the velocity of a fluid increases as the cross section of the container it flows in decreases (like when flowing through a funnel). The pressure at point 1 is higher than at point 2 however, due to the conservation of energy. The fluid flows faster in at point 2 than at point 1 due to the decrease in cross-sectional area. A diagram demonstrating the Venturi effect.
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