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Investigation of 3D flow in Typical Body and Decrease its Drag Coefficient at Hight Reynolds

Najdi, Ramin | 2013

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 45053 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Abbaspoor, Majid; Rad, Manoochehr
  7. Abstract:
  8. Rapid growth in energy consumption and environmental concerns over conventional power generation technologies has increased the need for alternative energy sources. Kinetic hydropower has been available for decades, however, despite its minimal environmental impact, commercialization has been limited. The main purpose of the first part of this thesis is investigation of flow properties near the convergent-divergent nozzles with various geometries. Two parameters that studied include variation of drag force on body and mean velocity of water flow in middle cross section. In the second part, we studied a horizontal marine current turbine (which its geometry is taken from a NREL wind turbine). Performance analysis methods of horizontal axis marine current turbines were developed using computational and experimental methods. Usually two methods are utilized for the computational analysis of turbines: (1) the blade element momentum theory (BEMT) method, and (2) the computational fluid dynamics (CFD) method based on the Reynolds-averaged Navier-Stokes equations. The CFD method has been used for both nozzle and turbine hydrodynamic analysis.A simulation was carrid out inorder to analyze the best performance a ducted turbine by optimizing the nozzle drag force and its geometry. Then results indicated a 30 percent imperovment in the ducted turbine efficiency under its best performance incomporisen with the case of turbine performance without the nozzle
  9. Keywords:
  10. Computational Fluid Dynamics (CFD) ; Drag Force ; Flow Separation ; Marine Current Turbine ; Convergent-Divergent Nozzles

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