| Summary: | 碩士 === 中原大學 === 機械工程研究所 === 102 === Abstract
This thesis conducts a study on the performance of a horizontal-axis wind turbine
system. The main purpose is to investigate the influences of blade aspect ratio and
hub-swept size ratio on its mechanical energy, electrical energy, rotor conversion
efficiency, generator conversion efficiency, and total conversion efficiency for
different wind speeds and attack angles. Frist, we design flake-type galvanized-iron
blades with different aspect ratios. Second, we connect the blades to the hubs with
different sizes and combine the rotor to the generator. Third, we set up the wind
turbine in the wind tunnel test system and then measure the wind speed, rotational
speed, torque, and power generation by using an anemometer, a tachometer, a torque
transducer, and an electricity meter, so as to obtain the horizontal-axis wind turbine
system performance data. Finally, we use STAR CCM+ for simulation to analyze the
blade surface pressure, velocities, and streamlines, so as to realize the cause of
dynamic phenomena.
Results reveal that all the mechanical energy, electrical energy, rotor conversion
efficiency, generator conversion efficiency, and total conversion efficiency in general
increase with the decreases in the blade aspect ratio and the hub size for different
wind speeds and attack angles. However, when the hub size decreases further, these
performance parameters would increase to their maxima and then decrease.
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