RU2353540C1 - 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 there are boundary layer turbulators in the form of belts with the possibility of their extension from the hull for regulation of its degree of turbulence (1. RU 2236979 C1 of 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 extend by a certain amount, which will cause an increase in the degree of turbulence of the boundary layer and a corresponding increase in the resistance of water to the movement of the vessel, i.e. IGV 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.

There are signs 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 devices that periodically cause transverse secondary currents in the boundary layer of the bow of the vessel.

It is known (2. Voitkunsky Y.I. Resistance to the movement of ships. - L .: Sudostroenie, 1988, - 288 p.) 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 on the surface of the hull, which determines the magnitude of the wave resistance, i.e. the height of the excited waves (see [2] on p.116). Thus, if turbulators are installed on the surface of the ship’s hull, which increase the perturbations 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 ([2], p. 53) that the transverse secondary flows periodically occurring in the boundary layer cause the phenomenon of ejection (discharge) of the liquid from the wall into the layer, generating turbulence.

The invention is as follows. Under the ice cover, a submarine begins to move at a resonant speed. If the height of the IGW excited at the same time is insufficient to destroy the ice, then during the movement of the vessel the degree of turbulence of its boundary layer is increased. For this, with the help of devices previously installed in the bow of the vessel, outboard water jets begin to periodically suck and pump, the velocity vector of which is oriented perpendicular to the ship's forward velocity vector. This will lead to turbulization of the boundary layer, corresponding to an increase in the resistance of the water to the vessel’s movement and the amplitude of the excited IGW, i.e. their ice-breaking ability. To regulate the degree of turbulence of the boundary layer, the frequency of suction (injection) frequency and fluid flow are changed.

The invention is illustrated by drawings, where: in Fig.1 shows a side view of the device; figure 2 is a section along aa in figure 1.

Under the ice cover 1 begin to move the submarine 2 with a resonant speed ν _P (figure 1). If the height of the IGV 3 excited in this case is insufficient to break the ice, then during movement using devices consisting of pumps 4 and water-resistant channels 5, outboard water jets 6 are periodically created (Fig. 2), which will increase the amplitude of the IGV 3 to the amplitudes of the IGV 7, i.e. to achieve the claimed technical result.

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 devices , periodically causing transverse secondary currents in the boundary layer of the bow of the ship.

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