Helical hydrokinetic stream lift/drag blade turbine

Under water unidirectional turbine rotation by omni directional stream
River / Tidal turbine. Self start helical twisted blades of machine operating efficiently at low fluid flow. Vertical, inclined and horizontal axis cross flow turbine.

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Category:

Science & Technology

Tags:

• environment

[guernafroman]

@railrdr523 This is true for wind turbines but not totally similar for tidal stream energy generation. Water is 800 times denser than air and it is because of this the same principles cannot be used . Much more work on the development of the technology is needed with specific development on the spacing and distancing from each other. If you go slow enough in a boat you can get very close to larger fish/ mammals. It is these turbulance of the propellor that scares the fish not movement of objects

[guernafroman]

@railrdr523

Wind turbines of similar design (Vertical axis turbines) require a smaller motor to get it sped upto a required speed to generate cost effective energy. a kick in speed of typically 4.5 knots (approximitly) are the required wind speeds needed and a sensor on the turbine tells it to kick in and a motor spins it upto speed thus lossing energy generated from previous kinectic extraction.

[TheTonchev]

It is a self starting machine at low water speed. It operates with high capacity factor and generate low cost power from 100% renewable energy. The turns slow - not any danger for fish - they much more faster.

[guernafroman]

Is this like the wind turbines that require a minimun wind speed of 4.5 meters per second before they are generating power, and do they require a motor to run them upto this speed thus using energy? If so would this not be inefficient underwater as the rising of the tide gets faster and slower as it falls, would only work properly within the middle of the tide? Plus would bigger fish not try to swim between the fins and get stuck and possibly damage the turbine?