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Performance Evaluation of a Flying Boat before Take-Off in Head Sea Condition

Maali Amiri, Mojtaba | 2013

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 45358 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Seif, Mohammad Saeed
  7. Abstract:
  8. An assessment of the relative speeds and payload capacities of airborne and waterborne vehicles highlights a gap which can be usefully filled by a new vehicle concept, utilizing both hydrodynamic and aerodynamic forces. A high speed marine vehicle equipped with aerodynamic surfaces (called a Flying Boat, 'Aerodynamically Alleviated Marine Vehicle') is one such concept. The purpose of this thesis is to evaluate the performance of a Flying Boat before take-off in head sea condition. First, performance will be assessed in calm water, and then will be evaluated in waves. Performance is defined as the variation of Resistance Force and Trim Angle of a vessel in an arbitrary interval. This evaluation in calm water will be carried out using three different approaches which are as follows: by developing relevant semi-empirical formula and then conducting a numerical simulation of a Flying Boat using CFX software and also by conducting an experiment in the Towing Tank of Mechanical Engineering Department of Sharif University of Technology. In the first approach, performance of a Flying Boat will be evaluated by developing relevant semi-empirical formula which has been utilized to assess the performance of the monohull high speed crafts. Taking into account the aerodynamic, hydrostatic and hydrodynamic forces acting on the FLYING BOAT, equations of equilibrium are derived and solved. This stage is conducted in calm water and provides the designer with the beneficial data on the motions of a Flying Boat and effect of different hydrodynamic and aerodynamic parameters on the performance of a Flying Boat in the possible least amount of time. Numerical simulation in CFX will be carried out in both calm water and waves. In this simulation the influences of air and free surface are modeled at the same time. Eventually, in order to validate the previous results, performance of a Flying Boat will be assessed experimentally. This stage will also be conducted both in calm water and waves.
    Finally data which is acquired from these three approaches can be used in optimizing the performance of the FLYING BOAT and also enhancing our view of the performance of the FLYING BOAT in calm water and in waves
  9. Keywords:
  10. Performance Evaluation ; Fly Boats ; Takeoff ; Model Test ; ANSYS Software

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