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Determination of Wake Effect of Stern on Performance of Marine Propeller with Self Propulsion Model Test

Ghareh, Amir Hossein | 2018

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 51284 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Seif, Mohammad Saeed
  7. Abstract:
  8. According to the increasing need of the world to increase the speed of existing technologies such as computers, cars, urban transport, etc. The need to carry goods at higher speeds is also a concern that due to its cost It can make a significant contribution to the economy. In the maritime industries, in addition to the commercial and economic orientation, there is also military capability the speed factor and the ability to navigate is very important for military vessels. The power in the sea is inevitably dependent to speed, so for Increasing the speed of vessels with regard to military and economic objectives needs optimized Propulsion systems which There are also limitations for them. the ships Propulsion systems are Restricted by Many such restrictions as Dimension of the propeller in the Stern of ship, in order to prevent collisions with the sea bed, the rotational speed limitation and the probability of occurrence of cavitation and reducing the propulsion efficiency, Geometric and Structural limitation For Propeller vibrations, which results fatigue, noise, and failure of the Propeller structure. Also, the resistance of vessels increases with increasing speed at high rates Considering the points mentioned above and considering that the wake flow of Stern which has a great impact on the propeller's performance, in order to accurately determine the performance of the propeller it is necessary to examine the performance of the propellers with due attention to the presence of the Stern and the wake flow of Stern. In this research, the hydrodynamic performance of propeller in open water and during the presence of ships Stern has been studied. And calculations relating to the Wake fraction, Thrust deduction coefficient, Hull efficiency, Relative rotative efficiency and Propulsive efficiency will be performed. due to this research, we should first choose the scale factor Then, by specifying the scale factor, the conditions of flow around the hull and propeller are considered, by monitoring Reynolds conditions, then the model of the hull and propeller with the obtained scale is made. as well as The Open Water test of the Propeller, the body-resistance test, is performed. with using the results of thess tests The test plan of self- propulsion test is written and model should be Equipped, with performed investigations, the constant speed method is described. in the related chapter the selected method is explained. And with the guidelines of the International Towing Tank Conference the results will be analyzed
  9. Keywords:
  10. Experimental Test ; Open Water Test ; Propulsion System Performance ; Propulsion Test ; Wake of Hull ; Resistance Test ; Screw Propeller System

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