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  • Author: Petrică Popov x
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Characterization of the Forces, Powers and Efficiency for a Naval Hydroelectromagnetic Thruster

Abstract

This paper presents a theoretical model of the hydroelectromagnetic thruster (electromagnetic three-phase induction seawater pump), which was developed from a semi-space model for an infinity conductor, where the electrically fluid - seawater occupies a semi-space, bordered by an ideally ferromagnetic wall. At the fluid surface, it is found a web of currents having density vector oriented in the direction of Oy axis, and fluid movement - considered a translational motion at constant velocity - is directed along the Ox axis. In this regard, for certain arrangements of three phase windings inductors, were performed calculations in order to estimate the forces, powers and efficiency for electromagnetic three-phase induction pump, having the seawater as induced fluid. Following the analysis of the traction force expression, it was found that it is possible to achieve a hydroelectromagnetic thruster, as a rectangular channel with the specific configuration of the three-phase windings, enabling to develop the electromagnetic traction forces for seawater as fluid induced conductor, forces comparable with propellers systems

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The Impact of the Wind Speed on the Dynamics of the Wind Energy System

Abstract

The paper analyzes the operation of electric power subsystem consisting of the naval marine wind turbine, the synchronous generator and the electric accumulators at linear and exponential variations of wind speed. The management system is analyzed using various functions of wind speed variation. This subsystem requires to capture the wind energy with maximum efficiency, so a diesel engine and a synchronous generator subsystem can be used only as a complementary source of energy.

Open access
Velocity Distribution Characteristics Of Sea Water In Conductiv Magnetohydrodynamic (MHD) Homopolar Ducts

Abstract

Shortcomings of conventional propeller propulsion can theoretically be removed by using a modern technology - unconventional hydroelectromagnetic propeller or magnetohydrodynamic (MHD thruster), that highlights an application of great interest about physical phenomena that occur in the interaction between electromagnetic fields and electrically conductive fluids. In application to marine propulsion, investigations of a variety of physical phenomena was carried out, including the flow characteristics in a MHD duct, thrust efficiency and optimum shape of the duct.

This paper presents related interaction phenomena between a magnetic induction, created by a d.c. electromagnet and d.c. current, perpendicular to the field, imposed by a voltage difference between two electrodes in the conductive sea water. The fluid is forced to the direction perpendicular to the plane where magnetic and electric fluxes are intersecting, this force is called the Lorentz force. Experimental and theoretical studies were carried out on small magnetohydrodynamic model (DC homopolar model) having two channels arranged in series or parallel. Each time the speed distribution was followed over the channel axis and perpendicular to channel axis.

Open access