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1- Department of Mechanical Engineering, Asa.C., Islamic Azad University, Asadabad, Iran
Abstract: (33 Views)
Increasing the efficiency of systems in commercial ships, as the most economical means of transportation, is important for reducing emissions and costs. Increasing propeller efficiency reduces the cost of operating a ship. The most popular kinds of propeller in merchant ships are metallic submerged propellers. Due to elasticity of propeller structure, hydrodynamic loads acting on propeller structure change its geometry, thus the hydrodynamic efficiency changes. Deformations of the blade depend on the properties of the structure, the elastic modulus and the Poisson ratio. To investigate the effect of structural properties and deformations on hydrodynamic performance, the Fluid-Structure Interaction was simulated for a propeller named VP1304. For this purpose, 6 cases with elastic moduli of 0.7, 6.8, and 68 GPa and Poisson's ratio of 0.17, 0.33, and 0.49 were simulated. By decreasing the elastic modulus and Poisson's ratio, deformations increased and the changes in thrust and torque coefficients and efficiency increased compared to the rigid propeller. In most cases, the propeller efficiency decreased and in certain cases, the propeller efficiency increased, which indicates that it is possible to increase the propeller efficiency by changing the structural properties of the blade.
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