Title page for etd-0906110-223921


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URN etd-0906110-223921
Author Chang-ching Lin
Author's Email Address No Public.
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Department Mechanical and Electro-Mechanical Engineering
Year 2010
Semester 1
Degree Master
Type of Document
Language zh-TW.Big5 Chinese
Title A study of water turbine power efficiency suitable for periodical ocean current in Penghu sea region
Date of Defense 2010-09-01
Page Count 116
Keyword
  • uniform flow
  • periodical current flow
  • immersed depth
  • Abstract This thesis investigates a horizontal water turbine blade designed to suit the periodical ocean current in Penghu sea region. Blade element momentum theory is exploited to design blade profiles. Then, CFD software, Fluent, is used to obtain such simulation result for torque, power, and efficiency. Firstly, performance of turbines with various cross-sectional profiles is discussed. Then, we use quasi-steady method to simulate power output of turbines from periodical ocean current and estimate how much ocean current energy we can obtain per day. Further, the performance of a turbine installed for different immersed depth from the surface is investigated.
    Our studies show that airfoil profile NACA6409 can outperform others in terms of high lift/drag ratio under low Reynolds number, and better hydrodynamic properties help the water turbine obtain higher torque and power output. A water turbine designed by using NACA6409, at R=1 m, at uniform velocity=2 m/s is estimated to generate 5KW output power. On condition of periodical current flow, the ebb tidal current can rotate water turbine, but power output is only 0.54 times of flood tidal current. The water turbine can generate more power when it is sited in deeper water, and less torque when it is sited near the water surface.
    Advisory Committee
  • Shou-Shing Hsieh - chair
  • Long-jeng Chen - co-chair
  • Peng-Sheng Wei - co-chair
  • Ru Yang - advisor
  • Ming-Huei Yu - advisor
  • Files
  • etd-0906110-223921.pdf
  • indicate in-campus access in a year and off_campus not accessible
    Date of Submission 2010-09-06

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