Annotated Bibliography Example | Topics and Well Written Essays - 750 words - 17

Annotated Bibliography Example Though the power coefficient of some of these turbines may be relatively low, they also work under low-quality winds. The writer claims that air flow approaching a wind turbine slows down by creating a low- pressure region behind the turbine. This pressure difference between the two sides of the propeller blades reduces the efficiency of doing work and increases the cost of wind power generation. Following to such loss a wing structure placed at a distance around the turbine is used to increase the power of the wind turbine by a factor of 2.0. The propeller is tightly fitted onto the inner shroud without leaving space between the tips of the propeller blades and the shroud. This method of improving wind turbine efficiency reduces the cost of generating wind power. These authors believe that the use of mantle’s nozzle which can be regulated can generate more quantities of electric power in wind turbine. The nozzle that is aerodynamically shaped ring induces a centrifugal force in the wind stream thus replacing free air stream with a concentrated stream of air. As a result, higher mass of air flows and velocity of this air behind the rotor reduced giving a higher energy output from the wind turbine in the nozzle. This increases the profit and reduces the cost of generating wind power. Though speed variation will increase, the concentration factor fc=2.5, it becomes inconvenient to work with wind at speeds exceeding the rated one. It is for this reason that control blades are installed on the frame side to let the excess air bypass the turbine rotor. This is however an additional cost and weight whose effects are adverse as well. These experts argue that steering aero foils are used to increase the rotational speed of wind blades. They are fixed surrounding the wind blades at an optimum distance whereby the angle of inclination can be valid. By adjusting the length and the angle of tilt, the rate can be