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Reducing Ships Fuel Consumption by Adjusting Operational Trim and Draft

Kazemipour Esferjani, Alireza | 2018

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 51364 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Seif, Mohammad Saeed
  7. Abstract:
  8. Nowadays, the attempts to reduce fuel consumption, greenhouse gas emissions and atmospheric pollutants, and economic savings, besides alignment with new rules, have been become the top priorities in the marines industry. In order to satisfy these goals, many efforts have been undertaken, including the vessel's trim and draft optimization which has done both experimentally and numerically and also thrust system simulation, to set a logical link between the effects of trim and draft of the ship and the calculated value of the required thrust from simulation to be able to optimize the fuel consumption. In this method, the ship is considered at the specific draft and the trim in bow and stern were found and then the vessel slowly move at the specific trim in calm water in different velocities to reach the minimum resistance of the hull. Then, considering the value of the resistance force, the required thrust force is calculated from the propeller and based on that, the RPM of the engine is adjusted in the simulator to achieve the lowest fuel consumption. Finally, the output of the simulator is like an applied software which all of the parameters such as the governing equations on engine performance, power transmission, propulsion and shape of main hull geometry have been considered in it and make it possible for users to model the fuel consumption in different operating conditions, and eventually in order to set optimal conditions for engine, the trim and draft of vessel will be optimized In this regard, at each draft, different trims are applied on the vessel and numerically and experimentally tested to measure the resistance. In this regard, the 7.753 meter KCS Container ship is modelled at the design velocity in various trims in the Star CCM+ software to validate the results in different trims from -0.1 to +0.1 meters, and Then, the statistical method of experimental design was carried out on the 1.185-meter of that model to calculate the resistance using numerical and experimental analyzes. The variety of resistance curves are concluded with respect to the changes in velocity, temperature and draft.
    In Simulink module of MATLAB software, the engine and propeller have been modelled. With regard to the variation of the resistance, the required thrust force is specified in the modelling and adjusted to that obtained RPM; after that, the fuel consumption is calculated using the engine RPM and environmental conditions as well as the dimensional parameters of the engine.Considering the utilized modellings and simulations, a software has been developed which is based on the coupling of hull and the thrust system estimation and as well as the amount of carbon dioxide emissions from combustion of fuel in different operating conditions of the engine. This software can also be used for other two-speed two-stroke engines and high-speed four-stroke engines with any type of fuel. It can be used for training as well as for calculating fuel consumption and emissions control
  9. Keywords:
  10. Fuel Consumption Reduction ; Experimental Design ; Draft Optimization ; Thrust System Simulation ; Trim Optimization

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