RU2353541C1 - Device for breaking down ice cover - Google Patents

Abstract

FIELD: shipbuilding.

SUBSTANCE: invention relates to shipbuilding, particularly, to submarine, which break down ice cover using the resonance method. Device for breaking down of ice cover is a submarine, capable of moving under ice with resonance speed and generating resonance bending-gravitational waves. On the surface of the body of the vessel on its fore ends is installed a boundary layer trip in the form of devices, periodically inducing in the friction layer transverse secondary flow.

EFFECT: increase in the effectiveness of breaking down ice cover by reducing costs and generating resonance bending-gravitational waves with amplitude, enough for breaking down ice cover.

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Description

The invention relates to the field of shipbuilding, in particular to submarines sailing in ice conditions and destroying the ice cover in a resonant way when surfacing in solid ice.

A device is known for destroying the ice cover, which is an underwater vessel capable of moving under ice with a resonant speed and generating resonant bending-gravitational waves (IGW), while on the surface of the hull of the vessel, in its bow, boundary layer turbulators are installed in the form of belts with the possibility of their extension from the hull to regulate its degree of turbulence (1. RU 2236979 C1 from 09.27.2004, Bull. No. 27).

The known device operates as follows. Under the ice cover, a submarine begins to move at a resonant speed. If the height of the excited IGW turns out to be insufficient for the destruction of ice, then during the movement of the vessel the degree of turbulence of its boundary layer is increased. To do this, on its upper surface put forward pre-installed turbulators, made in the form of extendable belts. In the normal mode of movement of the vessel, the belts are sunk into the hull and do not affect the boundary layer of the vessel. If necessary, the vessel emerges from under the ice, the belts are extended by a certain amount, which will cause an increase in the turbulence of the boundary layer and a corresponding increase in the resistance of the water to the movement of the vessel, i.e. IHV heights and their ice-breaking ability.

The disadvantage of this device is its structural complexity.

The objective of the invention is to simplify the design of turbulators.

The technical result consists in increasing the efficiency of the destruction of the ice cover by reducing the cost of exciting the IHV with an amplitude sufficient to destroy the ice.

The essential features characterizing the invention.

Restrictive: a device for destroying the ice cover, which is an underwater vessel capable of moving under ice with a resonant speed and exciting resonant bending-gravitational waves, while turbulizers are installed on the surface of the vessel’s hull to control the degree of boundary layer turbulence.

Distinctive: turbulators are made in the form of vibrators attached to the outer hull of the vessel in its bow.

It is known (2. Voitkunsky Y.I. Resistance to the movement of ships. - L .: Sudostroenie, 1988. - 288 s) that with an increase in the degree of turbulence of the boundary layer of a vessel, viscosity resistance, in particular, shape resistance, increases. In turn, the shape resistance affects the distribution of water pressure over the surface of the hull, which determines the value of wave resistance, i.e. the height of the excited waves (see [2] on p. 116). Thus, if turbulizers are installed on the surface of the ship's hull, which increase the disturbances entering the boundary layer, this will lead to an increase in both the total and wave impedances, i.e. to an increase in the amplitude of the excited waves.

It is also known (3. Pavlenko G.E. Water resistance to the movement of ships.- M .: Publishing House Maritime Transport. - 1956. - 507 s, p. 23), that one of the reasons for the transition of the laminar flow around the hull to turbulent is its mechanical shocks, i.e. body vibration.

The invention is as follows.

Under the ice cover, a submarine begins to move at a resonant speed. If the height of the excited IGW turns out to be insufficient for the destruction of ice, then during the movement of the vessel the degree of turbulence of its boundary layer is increased. To do this, the turbulators made in the form of vibrators are pre-attached in the bow of the vessel to its outer hull (under a light, i.e., easily deformable hull). The location of the turbulators in the nasal tip will ensure swelling of the entire surface of the body with a turbulent flow. If necessary, to increase the degree of turbulence, the amplitude and frequency of vibrations of the vibrators are increased, which will cause an increase in water resistance to the movement of the vessel and the height of the IGW, i.e. their ice-breaking ability.

The invention is illustrated in the drawing.

Under the ice cover 1 begin to move the submarine 2 with a resonant speed υ _p . If the height of the IGV 3 excited in this case is insufficient to break the ice, then the vibrators 4 are activated, while the height of the IGV 3 will increase to the height of the IGV 5, and the degree of this increase will depend on the amplitude and frequency of vibrations of the vibrators 4.

Claims (1)

A device for destroying the ice cover, which is an underwater vessel capable of moving under ice with a resonant speed and exciting resonant flexural-gravitational waves, with turbulators installed on the surface of the hull to control the degree of boundary layer turbulence, characterized in that the turbulators are made in the form of vibrators attached to the outer hull of the vessel in its bow.