Author:
Bugaev Viktor G.,Dam Van Tung Dam Van Tung,Domashevskaya Yana R.,Pham Trung Hiep Pham Trung Hiep
Abstract
Adequate assessment of the vessel’s turning capacity requires a thorough and detailed analysis of the hull shape and characteristics of the propeller-rudder system, as well as their interaction in the process of fishing operations. Using of experimental and numerical methods is extremely relevant and convenient solution to assess the vessel’s turning capacity. An important advantage of numerical methods in comparison with traditional methods, field tests and model experiments is the possibility of studying both the hull-nozzle-propeller system as a whole and each element separately, paying particular attention to its characteristics. The purpose of the research is to substantiate, using numerical methods of the hull shape and the characteristics of the propeller-rudder system (propeller in the nozzle) of the fishing vessel, which is intended for manufacturing and operation in Vietnam. The influence of the hull and the propeller on the hydrodynamic characteristics of the nozzle is due to the following factors: a) the presence of a propeller wave behind the hull; b) the presence of downwash of water flow when the vessel drifts; c) the presence of a free surface; d) increasing the flow rate, which runs on the nozzle, is made by the propeller. The speed of the vessel, the speed of rotation of the propeller and the angle of the nozzle rotation have also a significant influence on the hydrodynamic characteristics of the nozzle, and, consequently, on the propulsion and turning capacity. The results of calculations of the transverse and the resistance force acting on an isolated nozzle, a nozzle with a rotating propeller and with a rotating propeller behind the hull, have been presented.
Publisher
Volga State University of Water Transport
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