Gday lads, please rephrase this paragraph here. I need to prevent plagirism. If
ID: 1711813 • Letter: G
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Gday lads, please rephrase this paragraph here. I need to prevent plagirism. If you have any additional info regarding vertical axis wind turbine you are welcome to add them. I need at least 3-4 paragraphs. or 2-3. Cheers
Vertical-axis wind turbines (or VAWTs) have the main rotor shaft arranged vertically. One advantage of this arrangement is that the turbine does not need to be pointed into the wind to be effective, which is an advantage on a site where the wind direction is highly variable. It is also an advantage when the turbine is integrated into a building because it is inherently less steerable Also, the generator and gearbox can be placed near the ground, using a direct drive from the rotor assembly to the ground-based gearbox, improving accessibility for maintenance. However these designs produce much less energy averaged over time, which is a major drawback- The key disadvantages include the relatively low rotational speed with the consequential higher torque and hence higher cost of the drive train, the inherently lower 360-degree rotation of the aerofoil within the wind flow during each cycle and hence the highly dynamic loading on the blade, the pulsating torque generated by some rotor designs on the drive train, and the difficulty of modelling the wind flow accurately and hence the challenges of analysing and designing the rotor prior to fabricating a prototype oefficient, the When a turbine is mounted on a rooftop the building generally redirects wind over the roof and this can double the wind speed at the turbine. If the height of a rooftop mounted turbine tower is approximately 50% of the building height it is near the optimum for maximum wind energy and minimum wind turbulence. Wind speeds within the built environment are generally much lowerExplanation / Answer
VERTICAL AXIS WIND TURBINES
A device which converts bird's and wind's kinetic energy into electrical energy is known as a Wind Turbine. Wind turbine can be claasified into
Horizontal axis wind turbine
In this type, the main shaft and electrical generator is at the top of a tower, and also the wind turbine must be pointed into the wind.
Vertical axis wind turbine
In this type, the main rotor shaft is arranged vertically. In this type of arrangement, the turbine works effeciently even if it is not pointed in the direction of the wind. Therefore, this type of turbine can be used in sites were the wind direction varies randomly. In many cases it is an added advantage that the turbine is integrated into a building as a result of it's inherently less dirigible. Accessibility for maintenance can be improved by placing the gearbox and generator near the ground by using a direct drive from the rotor assembly to the ground- based gearbox. But one of the major drawback of this type of system is that, they produce less energy averaged over time.
The main disadvantages of vertical axis wind turbine includes, relatively low rotational speed as a result of higher torque and therefore the cost for the drive train will be higher It has lower power coefficient. There will be highly dynamic loading on the blade due to the 360 degree rotation of the aerofill within the wind flow during each cycle. Some of the rotor designs on the drive train can generate pulsating torque. It will be challenging to analyse and design the rotor prior to fabricating a prototype because of the dfficulty faced in modelling the wind flow accurately.
The working of a vertical axis wind turbine is as follows. Usually these turbines are fixed on the rooftop of the structure so that the wind speed at the turbine can be doubled because the structure redirects the wind over the roof. Maximum wind energy and wind turbulence is obatined if the height of the rooftop on which the turbine is mounted is approximately 50% of the height of the building.
The very first vertial axis wind turbine was developed by Georges Darrieus in France. His operation principle was on the fact that the turbines blade speed is a multiple of wind speed.
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