Method of destruction of ice cover

 

The invention relates to means for navigation in freezing pools. When the vessel 2 under the ice 1 with the resonant speed excite Flexural-gravity wave 3, of the fore part of the vessel 2 under the ice served in the air forming the air cavity 6, and then the vessel 2 inhibit. Associated thread 4, continuing the inertia of the movement, will meet on an obstacle in the form of staying vessel 2, which will lead to the emergence of the field of high pressure 7. When the collision of masses of water 8 ice 1, the action on the ice high pressure encountered in 7, there will be surges, which will cause ice 1 wave of expansion 9. The invention improves the efficiency of the impact on the ice cover. 1 Il.

The invention relates to the field of shipbuilding, in particular to underwater vessels, floating in ice conditions and destructive ice sheet resonance method when afloat in solid ice.

The prior art known from the way of the destruction of the ice cover of the resonant Flexural-gravity waves (VVM) excited by an underwater vessel when it is in motion and creating a water hammer on the ice from below through inhibition of underwater vessel with one of his limited ice destruction ability, i.e. insufficient amplitude of VVM.

The invention consists in developing a method of increasing the amplitude of the VVM.

The technical result obtained by carrying out the invention, is to increase the efficiency of destruction of ice underwater vessel.

The essential features characterizing the invention.

Restrictive: the ice cover is destroyed underwater vessel by excitation in ice resonant VVM, when it is in motion and creating a water hammer on the ice from below by a braking of the underwater vessel and air flow under the ice.

Distinctive: before braking under the ice to deliver air from the bow of the ship.

It is known (Voitkunskii J. I. resistance to the movement of ships. - Leningrad: Sudostroenie, 1988 - 288 C.) that when a body moves in a fluid at him due to the viscous properties of the fluid and for separating boundary layer is formed passing stream, i.e. the stream of translationally moving body of liquid. The speed of this flow in the area of the aft end of the body approximately equal to the velocity of the body. If the body, i.e., underwater ship to brake sharply, passing the stream, continuing its forward movement by inertia, will meet on an obstacle in the form of the course of hydraulics (Basta So M. and other Hydraulics, hydraulic machines and hydrobromide. M: Mechanical Engineering, 1982. - 424 C.), to surge, i.e., a sharp increase of pressure in the stern of the vessel. The imposition of this pressure to the pressure on the lower surface of the ice cover from the ripples of the water will increase the deformation of the ice, i.e. the amplitude of the VVM. If the deceleration of the ship under the ice to apply air from the bow of the vessel, i.e. in the area where only begin to form VVM and ice surface even niezdefiniowana (C. M. Kozin, A. C. Onischuk. Model studies of wave generation in a solid ice cover from the movement of the underwater vessel. - "J. Appl, Novosibirsk: Nauka, 1994. - 2. - S. 78-81), the air will begin distributed under the ice on the area, which extends in the direction of motion of the vessel is greater than the length of exclusive breastfeeding. With the development of exclusive breastfeeding in the direction towards the stern of the vessel, the air begins to concentrate under the tops of the VVM that at a certain flow rate will cause the formation of air pockets under several peaks of exclusive breastfeeding at the same time.

Due to the high compressibility of air in relation to the compressibility of water water from a region of high pressure, which emerged in the stern when braking vessel will flow in the direction of least hydraulic is korost, mass of water will displace the air and instantly stop when a collision with the bottom surface of the ice. Thus, there will be a concentration of the potential energy of pressure and kinetic energy of water at the hammer under the tops of the VVM, where he formed an air cavity. In the ice destruction capacity of the vessel increases, because the hammer will take several peaks of exclusive breastfeeding at the same time, which will increase the curvature of the ice.

The method is as follows.

Under ice cover at a given depth begin to move underwater vessel with a speed ofpfor resonant excitation of the VVM. If the amplitude of these waves is insufficient for the destruction of the ice cover, from cylinders of compressed air for blowing ballast tanks to deliver air from the bow of the vessel, which will lead to the formation below the tops of the VVM of air cavities, then, for example by reversing propellers, the ship abruptly stop. Associated thread formed behind the vessel during its forward movement, continuing the inertia of its movement, will meet on an obstacle in the form of a stopped vessel. This will lead to an abrupt increase in pressure in heaven and on the lower surface of the ice cover in the areas of the peaks of the VVM. Simultaneously, due to the high compressibility of air in relation to the compressibility of water from a region of high pressure in the feed will flow in the direction of the air cavities. Getting some extra speed, mass of water, having a higher density than air, displace the latter from under the peaks of exclusive breastfeeding and, moving by inertia, will instantly stop when a collision with the bottom surface of the ice. Thus, there will be concentration of potential and kinetic energy of water at the hammer under the peaks of exclusive breastfeeding, which will cause an increase in the deformation of ice, i.e., the amplitude of the VVM, and hence their ice destruction ability will increase.

The invention is illustrated in the drawing, which shows a diagram of the deformation of the ice cover from excited VVM and actions of the surge.

Under ice cover 1 at a given depth H starts to move underwater vessel 2 speedspthat excites the resonant system of exclusive breastfeeding 3. At the same time per ship due to the viscosity of water is associated flow 4.

If the amplitude of the wave 3 is insufficient for destruction ice 1, ice from the bow of the vessel 2 serves the air, and then the vessel is stopped (for example, C is the cavity 6. Associated thread 4, continuing the inertia of its forward movement, will meet on an obstacle in the form of staying vessel 2. The flow velocity after hitting the hull of the vessel 2 will decrease significantly, which will result in the stern of the vessel region of high pressure 7. Because the water when the real speed operation of vessels can be considered incompressible, the pressure is instantaneously transmitted to the lower surface of the ice 1 and, due to the compressibility of the air in the cavities 6, will cause the movement of masses of water 8 in the direction of the air cavities 6. When the collision of masses of water 8 with the bottom surface of the ice 1, the action on the ice high pressure encountered in 7, there will be surges, which will cause ice 1 wave of expansion 9. The superposition of these waves 9 VVM 3 will increase the total deformation of the ice, i.e., to increase the amplitude of the waves in the stern of the vessel, the profile of which is represented by the curve 10. The increase in the amplitude of the VVM 10 will increase the efficiency of destruction of ice cover 1.

Claims

Method of destruction of ice cover underwater vessel by excitation in ice resonant Flexural-gravity waves in its motion, creating hydraulics, before braking under the ice to deliver air from the bow of the ship.

 

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FIELD: shipbuilding; submarine vessels running under ice conditions and breaking ice cover by resonance method at surfacing in compact ice.

SUBSTANCE: while breaking the ice, ship makes several lanes at area of surfacing; number of lanes is dictated by safety of surfacing. Degree of breaking the ice is determined by maximum force of thrust of propeller.

EFFECT: enhanced safety of surfacing under ice conditions.

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