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Horizontal Axis Tidal Turbines (HATT)

Horizontal Axis Tidal Turbines (HATT) have a design that can be compared to horizontal axis wind turbines, the difference being that the energy is converted from a water flow instead of an air flow. Importantly, water has about 800 times the density of air. Marine energy is a very powerful resource and so a low-current speed can still be useful. The turbine has to face the currents in order to produce electricity, and that is why a bidirectional turbine design is preferable. It is the most common tidal turbine design. Variations between HATT designs can include the turbine size, number of blades, shape of blades, etc. 

Vertical Axis Tidal Turbines (VATT)

Vertical Axis Tidal Turbines (VATT) rotate around a vertical axis in the same fashion as vertical axis wind turbines. This device works with currents coming from any direction. It is, with the vertical axis tidal turbine, a popular design. 

Oscillating Hydrofoil (Reciprocating Hydrofoils)

Oscillating Hydrofoil devices consist in a foil attached to the tip of a mobile arm. Currents will exert pressure on the foil, forcing it to ascend and descend in an oscillating motion. Electricity is produced through an hydraulic system. 

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031103_1.pdf

Archimedes Screw

Archimedes Screw devices have an helical screw shape that will enter into rotating motion as the water flow (currents) is forced to go up the spiral shaped device. 

Tidal Kite

Tidal Kite devices are tethered winged devices (with a small turbine beneath the wings) that move in an "8" shape with the help of the tidal stream. 

출처 - http://www6.cityu.edu.hk/see_mer/tidal-devices.htm

Hydroventuri, Rochester Venturi(RV)

런던 임피리얼 대학교 Geoff Rochester에 의해 1997년 발명된 것.

Venturi Effect Devices are devices which funnel the water through a duct, increasing the water velocity. The resultant flow can drive a turbine directly or the induced pressure differential in the system can drive an air turbine.

RV구조는 파이프 내를 흐르는 물이 가속될 때 협착부에서 발생하는 압력 하강 현상, 즉 벤추리 효과에서 에너지를 갹출한다. 

1. http://goo.gl/fsu4ZD [본문으로]