RU2413650C1 - Hydrodynamic sweep - Google Patents

Abstract

FIELD: transport.

SUBSTANCE: invention relates to marine military equipment. Proposed hydrodynamic sweep comprises low-frequency vortex-type hydrodynamic radiator connected with supporting buoy, static deepening device and towing cable. Hydrodynamic radiator case represents a tube with stabilising wings. Tube open end faces leading flow. Tube other end is closed by elastic membrane, a cover. Striking mechanism with control unit enclosed in protective case is secured behind said membrane. Hydrodynamic radiator generates train of vortices that generate reduced pressure regions.

EFFECT: remote action on mine fuse.

5 dwg

Description

The invention relates to marine anti-mine weapons, in particular to hydrodynamic trawls, and is intended for trawling sea mines having a hydrodynamic channel.

Known hydrodynamic trawls made in the form of displacement bodies towed by a towing ship, the displacement of which should be approximately the same as the displacement of simulated ships. When towing such bodies in the same way as during the movement of the ship, a rarefaction zone is created under them on the ground - a reduced pressure (hydrodynamic field), to which non-contact mine detonators react. Displacement bodies can be made in the form of hard or soft shells filled with water; ordinary barges with increased explosion resistance can also be displacement bodies, made of, inter alia, separate interchangeable sections (see Marine Collection magazine No. 9, 1988, pp. 65-68).

Also known is the design of the towed hydrodynamic trawl, made in the form of a steel hollow carrier wing of negative buoyancy with dimensions of 20 × 3.5 m, which is towed at the bottom at a short distance, held by racks with steel rollers moving on the ground. A rarefaction zone is created under the wing, which is extended with the help of an extended elastic plate towed behind the wing, the leading edge of which is held by flexible buoyancy. The duration of exposure to reduced pressure is at least 8 s. In the event of an explosion, the elastic plate and buoyancy are destroyed and must be replaced. This design is selected by the authors as a prototype (see A.A. Kondratovich, G. G. Piyanzov, "Mine weapons", M., Military Publishing House, 1989, p. 35-38).

The main disadvantage of the prototype and all known structures of towed hydrodynamic trawls is that the rarefaction zone is created directly below the device that creates this zone, which leads to the explosion of a mine directly below the device, causing its destruction, i.e. almost all known towed hydrodynamic trawl designs are disposable systems.

The aim of the present invention is to provide a source of a hydrodynamic field in which the rarefaction zone acting on the hydrodynamic channel of a non-contact mine fuse would be located at a considerable distance from the field source.

This goal is achieved by the fact that in a hydrodynamic trawl containing a device that creates a hydrodynamic field, a tug cable, a supporting buoy and a static deepener, a low-frequency hydrodynamic vortex emitter connected to a cable tug, a supporting buoy and a static deepener is used as a source of the hydrodynamic field moreover, the emitter housing is made in the form of a pipe with stabilizing wings, the open end facing the incoming flow, and on the other hand the pipe is closed an elastic membrane cover, behind which a shock mechanism with control equipment is fixed, which is closed by a protective casing with holes on the stiffeners, the power and control of which are carried out by cable-tow.

This embodiment of the hydrodynamic trawl allows you to create a source of a hydrodynamic field in which the rarefaction zone acting on the hydrodynamic channel of a non-contact mine fuse is located at a considerable distance in front of the source of the field. The length of the cable tug is chosen so that the radiated hydrodynamic field decays, not reaching the towing vehicle.

Other technical solutions containing the features set forth in the claims as distinctive features are unknown.

The invention is illustrated by drawings: figure 1 shows a General view of a hydrodynamic trawl; figure 2 - low-frequency hydrodynamic vortex emitter (hereinafter - the emitter); figure 3 - ring vortex in the adopted coordinate system; figure 4 is a view of the rarefaction region created by a single toroidal ring vortex in the adopted coordinate system; 5 is a view of a rarefaction region created by a system of toroidal ring vortices.

The proposed device hydrodynamic trawl contains a radiator 1 with towing straps 2, a cable tug 3, supporting buoy 4, guy cable supporting buoy 5, a static recess, consisting of a set of loads 6 and a guide 7, a system of ring vortices 8. The emitter 1 consists of a housing 9 with stabilizing wings 10, elastic cover-membranes 11, impact mechanism 12 with control equipment 13, stiffeners 14, protective casing 15 with holes 16, pipe holes 17.

The work of the proposed hydrodynamic trawl is as follows.

The emitter 1 in FIG. 1 is towed by a tow cable 3, which is attached to the tow bar 2 on the upper surface of the emitter housing. Maintaining the emitter 1 afloat is ensured by a supporting buoy 4 connected to the emitter by means of a guy 5 attached to the upper tow bar 2. To keep the emitter 1 at a certain distance from the ground, a static recess is used, consisting of a set of weights 6 and a guide 7, which is attached to tow bar 2 on the lower surface of the emitter housing 1.

To stabilize the course of the emitter 1 (figure 2), stabilizing wings 10 are installed on its body 10. At the rear, the body of the emitter 9 is closed by an elastic membrane-cover 11, next to which an impact mechanism 12 is fixed on the stiffening ribs 12. Control of the repetition rate and impact intensity is provided by control equipment 13, which together with the percussion mechanism 12 is closed by a protective casing 15. Holes 16 serve to fill the protective casing with water to equalize the pressure on the elastic membrane cover 11.

In front, the case of the emitter 9 has a hole 17 from which emitted annular vortices 8 exit. Upon impact by a command of the control mechanism of the percussion mechanism 12 on the elastic membrane cover 11, a toroidal ring vortex 8, shown in FIG. .3. The pressure drop ΔP under a single annular vortex at point M in the coordinate system shown in figure 3 is determined by the formula

Where:

In the formulas (1) - (5) is indicated:

ρ is the mass density of sea water;

w ₀ is the velocity of the vortex, determined by the formula (2);

G - vortex circulation defined by formula (3);

R ₀ is the radius of the vortex;

r is the radius of the core of the vortex;

ω is the angular velocity in the core of the vortex;

θ is the polar angle in the selected coordinate system;

ν (x) is the speed induced by the annular vortex at the point M with coordinates (R, θ, x) (with the translational motion of the vortex relative to the fixed point M, the coordinates R and θ in the selected coordinate system are constant);

l is the distance from the vortex element dS to point M with coordinates (R, θ, x);

R is the length of the radius vector in the selected coordinate system;

X is the current coordinate along the x axis (applicate).

When a sequence of vortices is emitted, the total pressure drop ΔPs is defined as the sum of the pressure drops created by the individual vortices ΔP _i :

where n is the total number of vortices whose field is taken into account in the calculations.

The graph of Fig. 5 shows the dependence ΔP _S = f (x) upon emission of a sequence of vortices creating a low pressure region of length L, necessary for the operation of non-contact fuses min.

The use of the proposed low-frequency hydrodynamic emitter in a hydrodynamic trawl distinguishes it from the specified prototype. The resulting rarefaction zone acting on the hydrodynamic channel of a non-contact mine detonator and causing its explosion is located at a considerable distance in front of the field source.

The possibility of creating a rarefaction zone with the required parameters by generating a sequence of toroidal vortex rings is confirmed by testing a model of a similar device in the basin of the Naval Engineering Institute, Pushkin, act No. 3-17 / 09 of February 4, 2009.

Claims (1)

A hydrodynamic trawl containing a device that creates a hydrodynamic field, a tug cable supporting a buoy and a static deepener, characterized in that a low-frequency vortex hydrodynamic radiator connected to a cable tug supporting a buoy and a static deepener is used, and the emitter body made in the form of a pipe with stabilizing wings, the open end facing the incoming flow, and on the other hand the pipe is closed with an elastic cap - embranoy, followed by a closed protective cover with the holes in stiffeners fixed hammer mechanism with control equipment, power supply and which is controlled by a cable-tow.

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