KR980001706A - Method and apparatus for reducing fluid pressure resistance and preventing cavitation using electromagnetic force - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to fluid dynamics such as fluid pressure resistance reduction and cavitation phenomena acting on a body of any shape relative to a fluid.

An object of the present invention is to solve problems such as damage to the surface of the moving body and cavitation noise due to pressure resistance and cavitation phenomenon due to the flow peeling acting on the moving object of any shape relative to the fluid.

In order to overcome the inefficiency of the conventional method for reducing pressure resistance through various flow separation control, the present invention is characterized by solving this problem by using electromagnetic force.

The electromagnetic force acts on an electrically conductive fluid such as seawater, attracts the fluid in the direction of the electromagnetic force, and simultaneously increases the pressure of the fluid in the direction of the force. Therefore, the flow separation caused by failing to relieve the reduced pressure at the rear of the moving body can be controlled by pulling the streamline of the fluid to be attached to the surface of the moving body by the electromagnetic force, and the cavitation phenomenon is that the electromagnetic force is linear in the direction of its action. It can be prevented by increasing the pressure by increasing the pressure.

The use of the present invention can be adapted to the reduction of the fluid pressure resistance by the flow separation when the moving object having any shape, such as cylindrical, spherical (square), or airfoil relative to the fluid and the propulsion of ships, submarines, torpedoes, etc. It is applied to solve the speed limitation problem caused by cavitation by preventing the cavitation phenomenon caused by excessive decrease of the pressure of propeller, and to improve the propulsion efficiency and realize high speed operation.

Description

Method and apparatus for reducing fluid pressure resistance and preventing cavitation using electromagnetic force

Since this is an open matter, no full text was included.

1 is a perspective view of a fluid pressure resistance reduction and cavitation phenomenon prevention device for cylindrical objects using the electromagnetic force according to the present invention.

FIG. 2 is an enlarged view of part A of FIG. 1, showing the arrangement of electrodes and magnets, and a state diagram of electric and magnetic fields.

3 is a relationship between electric field vector, magnetic field vector, and electromagnetic force vector.

4 is a cross-sectional view taken along line B-B of FIG. 1, showing a power supply state of electrode elements located in the flow peeling generation portion.

FIG. 5A is a partial cross-sectional view taken along line B-B showing a flow separation state occurring at the rear of a cylindrical object under a general turbulent flow state. FIG.

Figure 5b is a partial cross-sectional view B-B showing the state of use of the fluid pressure resistance reduction and cavitation phenomenon prevention device for cylindrical objects using the electromagnetic force according to the present invention.

Figure 6 is a propeller scene view showing a propeller cavitation phenomenon preventing device using an electromagnetic force according to the present invention.

Claims (9)

A method according to claim 1, wherein the electromagnetic force is used to reduce the pressure resistance of the fluid acting on an object of any shape relative to the fluid and to prevent cavitation. The method of claim 1, wherein the electromagnetic force is used to reduce pressure resistance and prevent cavitation of the fluid acting on the cylindrical attachment. 2. A method according to claim 1, wherein electromagnetic force is used to reduce the pressure resistance of the fluid acting on the hydrofoil shaped body and to prevent the cavitation phenomenon. The method of claim 1, wherein an electromagnetic force is used to prevent cavitation from acting on the propeller. An apparatus for reducing pressure resistance and cavitation of a fluid, characterized in that electromagnetic force is used to reduce pressure resistance and prevent cavitation of a fluid acting on a body of any shape relative to the fluid. The positive electrode of the electrode so that the electrode and the seat coincide with the surface of the moving body so that the electromagnetic force can act on the moving surface of the moving body of any shape, the N pole of the magnet on the surface of the moving body, -) Poles, arranged alternately in the order of the S poles of the magnets on the surface of the moving body, to correspond to the axial or radial length of the rotary moving body of any shape relative to the arrangement direction of the electrodes and magnets, and the respective electrode elements, Arbitrary shape movement by supplying power to the electrode elements through the energizing electrode selection switch in the switch box, using a power supply generally used to insulate the magnet elements and the electrode and the moving body which is the receptor of the magnet. The electric field is formed on the surface to intersect with the magnetic field applied to the fluid by the magnet and the electromagnetic force is reduced in direction and flow separation. B. It is applied in the direction of peeling and flow away, that is, in the direction of flow of fluid along the surface of the moving body, so that the fluid does not peel off and is pulled out to be attached along the surface of the moving body to suppress flow separation, and the pressure is excessive. A device capable of preventing the cavitation phenomenon by increasing the pressure of the fluid by applying an electromagnetic force to the surface of the moving body that is lowered cavitation phenomenon. The apparatus of claim 5, wherein the fluid pressure resistance reduction and cavitation phenomenon prevention apparatus uses electromagnetic force for a cylindrical object. 6. The apparatus of claim 5, wherein the fluid pressure resistance reduction and cavitation phenomenon prevention apparatus using electromagnetic force for hydrofoil type objects. The apparatus for preventing cavitation phenomenon according to claim 5, wherein the electromagnetic force for propeller is used. ※ Note: The disclosure is based on the initial application.