What is the critical hydraulic design consideration when integrating bulb turbines into tidal barrage structures, particularly in relation to cavitation avoidance?

The critical hydraulic design consideration when integrating bulb turbines into tidal barrage structures, particularly in relation to cavitation avoidance, is ensuring sufficient net positive suction head (NPSH) at the turbine runner. Bulb turbines are a type of axial flow turbine where the generator is enclosed in a watertight "bulb" located directly in the water passage. Cavitation is the formation of vapor bubbles in a liquid due to a reduction in pressure. When these bubbles collapse, they create intense pressure waves that can damage the turbine blades, reducing their effic....