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Experimental and Numerical Investigation the Effect of Geometry on Hydrodynamic Performance in Surface Piercing Propeller

Teimouri Rabor, Mahdi | 2022

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  1. Type of Document: Ph.D. Dissertation
  2. Language: English
  3. Document No: 55764 (58)
  4. University: Sharif University of Technology, International Campus, Kish Island
  5. Department: Science and Engineering
  6. Advisor(s): Seif, Mohammad Saeed
  7. Abstract:
  8. Due to the suitable performance characteristics and the widespread use of Surface Piercing Propellers (SPPs) in high-speed crafts, many experiments and numerical studies have been conducted in this field. Due to the lack of a comprehensive series similar to conventional propellers in the field of SPPs, in this thesis, it has been tried to personalize the suitable basis by conducting two separate experimental tests in the National Iranian Maritime Laboratory (NIMALA) towing tank and the cavitation tunnel at Sharif University using computational fluid dynamics method and the commercial code STAR-CCM+. For this purpose, a wide range of phenomena and effective parameters on hydrodynamic performance and forces and moments components on the key blade such as pitch ratio, blade number, immersion ratio, scale effect, ventilation at various operating regions, and non-dimensional numbers such as Froude were investigated for a series of SPPs for different advance coefficients. At first part of the research, immersion ratio of the propeller in the towing tank was studied and checked by numerical method for details of the flow. In the second part of the research, a new family of the surface SPP was designed and produced and after preparation and adaptation the cavitation tunnel for free surface conditions was tested and data was summarized. With the same approach data was used for validation of numerical method and it was attempted to detail the flow on the blade. In the final part of the research scale effect in extrapolating of the model to full scale SPP was investigated by validate numerical method. The results obtained from the present study indicate that changing each parameter such as immersion ratio, pitch per diameter, number of blades, expanded area, advance coefficient, Froude number, and scale of the propeller can change the performance of the SPPs. By study the details of the flow, we can understand that aeration of the blade has main role in this propellers. More details of the results have been presented in the main text of the thesis.
  9. Keywords:
  10. Towing Tank ; Numerical Simulation ; Scale Effect ; Geometry ; Experimental Test ; Surface Piercing Propeller

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