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Optimizing the Propulsion Arrangement of a Par Wig Craft to Reduce the Take-off Time

Mafakher, Mohammad Reza | 2019

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 51674 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Seif, Mohamad Saeed
  7. Abstract:
  8. In this thesis, an attempt is made to provide a hydro-aerodynamic mathematical model of a 20-bird batboat with a combined wing with catamaran body shape equipped with a parachute propulsion system in the rising phase of the surface and optimizing the propulsion system to reduce the take-off phase of the bird's boat. For this purpose, the hydro-aerodynamic modeling of the bird's boat from the rest period to the cruise phase has been considered, taking into account the parachuting system. For this purpose, three methods are considered. In the first method, combinatorial wing aerodynamic modeling and hydrodynamic modeling of the radar catamaran float were first studied. Finally, in the case of non-invasive time, with the coupling of these two models (aerodynamic and hydrodynamic modeling) and taking into account the dynamic air padding under the bird's boat, a parachuting system is proposed, the hydro-dynamical modeling of the bird's boat is presented. In the second method, the first method is solved by considering the time. The effects of acceleration within the equations are observed. In the third method, the bird's mathematical model is simultaneously extracted using computational fluid dynamics methods. This method is intended to take into account the interactions between the aerodynamic part with the hydrodynamics of the bird's boat as well as the temporal phenomena not considered in the first method. In this method, the bird's float begins to move in a steady state with engines turned on. It should be noted that the first method was developed by Mr. Tavakoli and his colleagues. The ultimate goal of this thesis is to provide a practical solution for optimizing the hydro-aerodynamic of the bird's boat. For this purpose, the target functions, take-off speed and bird-hopping time have been calculated. The variables of the optimization of the location of the tresterers of the propulsion system are considered
  9. Keywords:
  10. Fly Boats ; Screw Propeller System ; Duct ; Propeller Hydrodynamic ; Hydrodynamic Modeling ; Catamaran Boat

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