Various kinds of Rotors/Propellers in hydrokinetic tubines,

Sep 9, 2017   //   by admin   //   Knowledge Base  //  No Comments

A Hydrokinetic turbine is a turbine originator to generate electricity in a free run environment. It does not require a dam . It is utilized in the special term called the In stream Energy Generation Technology (IEGT) which places turbines in rivers, tidal waters, or ocean currents and man made channels as well. These turbines make use of flow of water to twist them, thus producing electricity for the power grid . In outcome, IEGT is like placed windmills in the water which is generally very environment friendly. While hydrokinetic comprises production from currents and waves & ocean tides . The most practical application in the near future will be in streams and rivers .

A Hydrokinetic turbine is basically based on the principle of rotating directional power into rotational power by utilizing definite quantity of surface to be in contact with the solution faction over a period of time in order to tie together a large amount of power as much as possible. There are various factors on which it depends like shape, spacing between blades, angle of de fraction which can significantly advance the effectiveness of a turbine. Thus it is utilized in the area of research in make out of the best hydrokinetic turbine appropriate for its exact position of appliance. There are various types of low head turbines, rotors/Propellers are designed and utilized which are mentioned below:-

 

Kind of low head turbines

These Turbines suitable for use in very small head function and are different from the propeller, Pelton / Kaplan types used in more conventional hydro which are large in size.

Various kinds of low head application turbines are as follows:-

  • Axial Flow Rotor Turbine: In this type of turbine there is a concentric hub which is attached to radial blades and it looks like a wind mill. Whichever , a construct of a hydraulic pump or electrical generator which rotate an electrical generator on ground in order to generate electricity.
  • Open Center Fan Turbine: This special type consist of two donut shaped turbines which rotate in the opposite direction of the current. This in turn runs a hydraulic pump that in turn drives a standard electrical generator.
  • Helical Turbine: This type of turbine has hydrofoil sections that keep the turbine oriented to the flow of the water. The leader edge of the blades turns in the direction of the water.
  • Cycloidic Turbine: The cycloidic turbine resembles a paddle wheel, where the flow of the water turns the wheel with lift and drag being optimized. Lift or flutter vanes looks like a huge Venetian blind.
  • Hydroplane blades: They are made to oscillate by the flowing water, thus generating electricity.
  • FFP Turbine Generator: This type of turbine uses a rim-mounted, permanent magnet, direct-drive generator with front and rear diffusers and one moving part (the rotor) to maximize efficiency.

Other useful Rotors/Propellers are as follows:-

 

Oscillating Water Column– Using a bell shaped housing, this device floats atop the ocean surface confine the natural rise and fall of the waves allowing the air entrapped above the waves to become pressurized with every rise. As the top of the structure becomes smaller, the force of the air becomes smaller and the speed increases which is converted to electrical energy via a compressor turbine.

 

Heave Surge Device– A snake-like device that rides atop the ocean surface set into the path of oncoming waves and is tethered at the front to the ocean floor. As a wave passes over the first section, a rotational motion is set forth causing the energy of rotation to increase as the wave reaches the next section. A set of hydraulic fluid pumps located in the last joint at the back of the device are forced through the rotational energy to turn a motor which converts this into electrical power through a generator.

 

Tidal Turbine– In accessing the underwater ocean currents or natural flow of rivers and tides, underwater turbines can be utilized much like wind turbines in converting a directional flow of energy into rotational mechanical energy. Since wind turbines have been designed and in use for much longer, many companies have turned to these designs to develop underwater turbines which harness the power in much the same way. Other companies have looked at large propellers from ships to account for the fluid dynamics involved with efficient water flow through spinning blades. Although the conventional design is to set the rotating shaft in line with the flow of the water, some have started to research the advantages of placing the rotating shaft vertical to the flow, allowing a larger surface area to come into contact with the flow, but dramatically decreasing the outgoing flow velocity.

 

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