power for its size by forcing extra air into the combustion chamber.[1][2] A turbocharged engine is more powerful and efficient than a naturally aspirated engine, because the turbine forces more air, and proportionately more fuel, into the combustion chamber than atmospheric pressure alone. 1.2) A propeller is a type of fan that transmits power by converting rotational motion into thrust. A pressure difference is produced between the forward and rear surfaces of the airfoil-shaped blade, and a fluid (such as air or water) is accelerated behind the blade. Propeller dynamics can be modelled by both Bernoulli's principle and Newton's third law. A marine propeller is sometimes colloquially known as a screw propeller or screw. 1.2.1A controllable pitch propeller (CPP) or variable pitch propeller is a type of propeller with blades that can be rotated around their long axis to change their pitch. If the pitch can be set to
17 Source:dpa, Die Welt Video clip: Oscillating water column S o u r c e : https://www.youtube.com/watch?v=gcStpg3i5V8&list=PL1BCA44C365504B48 &index=2 Two different types of turbines are used to convert the energy. One is a Wells- type turbine which is mostly used. A Wells turbins looks like an airfoil with a symmetric profile. But due to the symmetry the turbine has a poor efficiency. It uses the physical principle of a hydrostatic uplift, called buoyancy. A Wells turbine can be attacked from both sides so that it has a consistent turning direction. Principle of a Wells turbine 18 The second type of turbines used in an open water column power plant is an impulse turbine with free rotating blades using the air flow from both directions.
drag. FAA suggests that the wing be inclined some 10-13 degrees nose down (when inverted) depending on the airfoil characteristics (Figure 5). If no information is available from the designer/plans vendor, 12 degrees is a good starting point. Fiberglass/ply-
more than twice as much wind energy as any other state. The first offshore wind park in the United States is planned for an area off the coast of Cape Cod, Massachusetts (read an article about the Cape Cod Wind Project). 9.2 How wind machines work Like old fashioned windmills, today's wind machines use blades to collect the wind's kinetic energy. Windmills work because they slow down the speed of the wind. The wind flows over the airfoil shaped blades causing lift, like the effect on airplane wings, causing them to turn. The blades are connected to a drive shaft that turns an electric generator to produce electricity. With the new wind machines, there is still the problem of what to do when the wind isn't blowing. At those times, other types of power plants must be used to make electricity. 9.3 Types of wind machines There are two types of wind machines (turbines) used today based on the direction of the
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