Title: Performance evaluation of composite marine propeller using L 8 orthogonal array
Abstract: This work aims at understanding the effect of various parameters on the performance of a marine propeller using L8 orthogonal array. The parameters chosen are advance velocity , rotational speed and the stacking sequence. A four bladed composite propeller made of glass-epoxy is modelled using dynamic hydro-elastic scaling laws for marine propulsors and analyzed using the hydro-elastic model. An L8 orthogonal array is used for understanding the effect of various parameters and their interaction effect on the performance of a marine propeller in terms of open water characteristics. Marine propeller is a component which forms the principal part of ships since it gives the required propulsion. Fiber reinforced plastics are extensively used in the manufacturing of various structures including the marine propeller. The hydrodynamic aspects of the design of composite marine propellers have attracted attention because they are important in predicting the deflection and performance of the propeller blade. A procedure for calculating the blade performance must involve numerical methods accounting for the nonlinear deflection and loading. A geometrically non-linear calculation is needed to calculate the quasi-static deflection of the blade that results from the centrifugal force and the distribution of pressure in the fluid. For designing an optimized marine propeller one has to understand the parameters that influence the hydro-dynamic behavior. Since propeller is a complex geometry, the analysis could be done only with the help of numerical tools. Most marine propellers are made of metal material such as bronze or steel. The advantages of replacing metal with an FRP composite are that the latter is lighter and corrosion-resistant. Another important advantage is that the deformation of the composite propeller can be controlled to improve its performance. Propellers always rotate at a constant velocity that maximizes the efficiency of the engine. When the ship sails at the designed speed, the inflow angle is close to its pitch angle. When the ship sails at a lower speed, the inflow angle is smaller. Hence, the pressure on the propeller increases as the ship speed decreases. The propulsion efficiency is also low when the inflow angle is far from the pitch angle. If the pitch angle can be reduced when the inflow angle is low, then the efficiency of the propeller can be improved. Traditionally marine propellers are made of manganese-nickel-aluminum-bronze (MAB) or nickel-aluminum-bronze (NAB) for superior corrosion resistance, high-yield strength, reliability, and affordability. More over metallic propellers are subjected to corrosion, cavitation damage; fatigue induced
Publication Year: 2011
Publication Date: 2011-01-01
Language: en
Type: article
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Cited By Count: 9
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