Ice the water tank for testing ship models and marine engineering structures and the method of its use

 

The invention relates to Maritime transport and for the design model basins. The water tank contains ice chamber filled with liquid the Cup separated from the work area and dock, as well as chillers with cooling system of the ice chamber. Pool filled with fresh water and is equipped with a movable bottom with adjustable height lift. Mobile bottom has overlapping end-to-end window for bypass water. Top the rolling surface of the bottom is covered with material with adhesion to ice less than 30 kPa. Edge rolling of the bottom side of the dock part has a protective barrier-rib, the height of which exceeds the doubled thickness of the created ice fields, and the rest of the edges along the perimeter of the work area is equipped with a device to create a waterproofing cracks between the edges of the rolling walls and bottom of the bowl and education open trough-shaped containers on the movable bottom, which filled the water NaCl solution for growing ice fields. Raising and lowering of the movable bottom is carried out at the open through holes and removed the waterproofing. Mobile bottom up above the water and on its surface serves layer of aqueous NaCl solution, which is cooled to a temperature -0,3

The invention relates to the field of Maritime transport and relates to the design of the ice model basins for testing ship models of ice navigation and ice-resistant offshore engineering structures, as well as creating them in the ice field and its operation.

Known for the water tank for testing models, made by the author. St. USSR 1000817, CL G 01 M 10/00 containing filled with fresh water bowl and a tow Dolly with electric drive and running wheels in contact with the rails laid along the bowl, the tested model, sensors kinematic parameters of the motion model, torque and recording equipment.

A disadvantage of the known device is the inability to hold in it testing models of ships and ice-resistant engineering structures in ice conditions.

Known also about aderrasi ice chamber, filled with a water solution of NaCl given the salinity of the bowl, on the surface of which is formed ice chillers with cooling system of the ice chamber and a tow Dolly with electric drive and running wheels in contact with the rails laid along the bowl, the test model mounted on the towing carriage, a speed sensor, a torque and recording equipment (Y. N. Alekseev, O. N. Bezzubik, C. A. Belyashov, C. S. Shpakov. The experimental capabilities of the new ice model basin CRI them. Acad. A. N. Krylov. - Shipbuilding industry. Series: ship Design, vol. 13, 1989) is adopted for the prototype. Ice pool is widely used for studying the processes of interaction with ice icebreakers and vessels active ice navigation, and predict the resulting ice loads in different ice conditions typical of those areas where they operated. It also tests the models-resistant bases drilling platforms.

There is a method of using the ice model basin, where the preparation of the ice field cooled water in the pool to the desired temperature is x ice crystals, then maintain the optimum temperature for growth of ice crystals in the direction perpendicular to the surface of the water in the bowl (Castellan Century. And., Poznyak I. I., Rivlin A. J. Resistance of ice movement of the vessel. Leningrad: Sudostroenie, 1968, S. 48-63) prototype.

The disadvantages of the known device and method are the high cost of energy and time for preparation of the ice field, as well as a large depreciation of the equipment pool, caused by contact with aggressive environment - filling the pool water NaCl solution during repeated temperature changes.

The claimed invention solves the problem of increasing the efficiency of the ice model basin by a significant reduction in wear due to the termination or drastic reduction of the time of its contact with an aggressive environment, and also by reducing the energy and time spent on the preparation of the ice field.

For this purpose, in known ice pool for testing ship models and marine engineering structures containing ice chamber filled with liquid the Cup separated from the work area and dock part, chillers with cooling system of the ice chamber and dispensing ice nabeena movable bottom, covering the entire area of the working area of the pool and made with the possibility of changing the height of his ascent above the base of the pool, with mobile bottom contains overlapping pass-through window to bypass the water, and on top of its surface covered with a material having adhesion to ice less than 30 kPa, with the edge of the rolling bottom from the dock part has a protective barrier-rib, the height of which exceeds the doubled thickness of the created ice fields and the rest of the edges along the perimeter of the work area is equipped with a device to create a waterproofing cracks between the edges of the rolling bottom and walls of the pool and open education-shaped container on the movable bottom, which filled the water NaCl solution for growing ice fields.

In the method of creating an ice field in the fluid-filled bowl of the water tank, comprising introducing into the bowl of the seed in the form of ice crystals, creating a temperature regime for the formation of the ice field and control its thickness, the pool is filled with fresh water, and ice are grown from the additional insertion of a water NaCl solution, which is first cooled fresh water to a temperature of 4oAnd the second layer of water within the work area overlapping the movable bottom with end-to-end, pre-open bypass Windows and carry out waterproofing cracks between the edges of the rolling walls and bottom of the Cup and the closure through the Windows, forming on its surface an open trough-shaped container, which is grown ice field, for which it creates a layer of water NaCl solution of a given concentration of a height corresponding to the thickness of the formed ice fields, which first vyholodzhuyut to a temperature -0,3-0,5oAnd then it make a seed crystal, and remaining after the formation of ice between the ice and the movable bottom remains unfrozen water salt solution is removed, and then moving the bottom lower for the education required for the experiment, the water, after removing the waterproofing and opening the bypass box, which when reaching a movable bottom depth range, then block.

Fill the pool with fresh water can significantly reduce the aggressiveness of the environment - the fluid that fills the pool and causing corrosion of equipment and thus reduce the wear and tear of the equipment pool.

The supply of the pool movable bottom with perekryvayuschiimisya growing on it ice fields specified thickness of the water-salt solution NaCl and isolation of this salty ice fields from the rest of the fresh water of the pool in the freezing ice.

The presence on the surface of the rolling bottom of a material having low adhesion to ice less than 30 kPa, reduces the adhesion of the ice field with the top surface of the movable bottom, which facilitates the separation nevrogennogo ice from its surface.

Overlapped end-to-end window in the movable bottom allow you to freely move vertically relative to the bottom of the pool.

Pre-cooling in the process of creating the ice field from the salt solution NaCl fresh water to a temperature of +4oTo achieve the greatest density of fresh water.

Cooling the surface layer of fresh water to the 1oWith the need to ensure the sustainability of this layer due to the lower density of water at 1oCompared to its density at 4oC.

Cooling salt water solution of NaCl to a temperature -0,3o-0,5oWith before making seed is necessary to ensure the early growth of the ice field immediately after making seed.

The essence of the claimed invention is illustrated by drawings, where Fig.1 shows a cross-section of the ice model basin; Fig.2 - General view of the movable bottom.

Ice the water tank (Fig whom reportedly technological trolley 4, used for making ice field 5, the refrigerating machine with cooling system of the ice chamber 6 and the drain water from under the ice field 7 when the pressure in the gap 8 between the movable bottom 9 and ice 5.

Mobile bottom 9 is a device for lifting, such as a hydraulic cylinder 10, the base of which is installed at the bottom of the pool 1, the upper surface of the movable bottom is covered with a layer of material 11 with a low coefficient of adhesion to ice less than 30 kPa, for example Teflon, in the movable bottom is made of hermetically closing the through holes 12 for the passage of water, as well as around the perimeter of the rolling bottom 9, except the side adjacent to the dock part of the basin, installed waterproofing 13, preventing the flow of water, such as a hollow rubber tube, in which the air is supplied to high pressure. Mobile bottom has dimensions matching the dimensions of the work area of the pool from the side of the dock part of the basin is barrier-flange 14 (Fig. 2), the height of which exceeds the total thickness of the ice cover 5 and the gap between podvijnym bottom and ice 8.

The gain in energy consumption from the use of the proposed device can be estimated as follows. Calculations will provoditsya: length 35 m; width 6 m; the depth of 1.75 m water Volume will be V= 643,125 m3. In the prototype, this amount must be cooled from some temperature t to-0.5oC. it consumes the following amount of energy Q = cWWV[t-(-0,5)], W, where cwthe heat capacity of water,W- the density of water. In the proposed device the bulk of fresh water is cooled to an average temperature3oWith only a layer of an aqueous NaCl solution is cooled to a temperature of-0.5oC. the Volume of this layer is equal to Vc=3560,08=16.8 m3. In this case, the energy costs will be Q1= cWW(V-Vc)[t-3]+cWWVc[t-(-0.5)]. Neglecting the second member written in the equation because of its smallness, we get that the cost of the new device at t=15oWith 30% less than for the prototype.

The gain in time when using the inventive device occurs due to the reduction of the cooling time of the water in the pool, but also because reducing the amount of time the cooling gap is th control salinity of fresh water. Its salinity will gradually increase because the fresh water will get drained from cooked ice field brine. With increasing salinity of fresh water to 20/00, the pool water is diluted with fresh water.

The proposed device according to the proposed method works as follows.

The entire volume of fresh water 2 contained in the bowl of ice pool 1, cooled to a temperature of 4oUsing the refrigerating machine 6. After that, the surface layer of fresh water 2 further cooled to a temperature of 1oC. During these operations movable bottom 9 is located on the bottom of the bowl 1.

After you create the required temperature in the volume of fresh water 2 mobile bottom 9 raise to the surface using a hydraulic cylinder 10, the first opening of the through hole 12 for the passage of water. After the rise of the rolling bottom, through hole 12, sealed and restore the waterproofing around the perimeter of the rolling bottom, except for his hand, on which is mounted a protective visor 14.

On the free surface of the rolling bottom 9 pour water solution of NaCl given salinity 8, the thickness of which is approximately equal to the thickness of the ice field 5, which on its surface create an ice field 5. During the growth of the ice field excess amount of salt water is removed from the gap 8 between the ice and the top surface of the movable bottom 9 with the help of the compensation system 7.

After numerazione ice fields specified thickness open through holes 12 in the movable bottom, this creates contact nevrogennogo salty ice with fresh water, which leads to melting of the lower edge of the ice field. In the process of melting decreases the adhesion of the ice field with the top surface of the rolling bottom 9, covered by a material with a low coefficient of adhesion to ice. Upon termination of the grip ice with a movable bottom, the latter is lowered to the given conditions of the experiment depth. After installation of the rolling bottom at the specified depth of the through hole is closed. The device is ready for testing.

Claims

1. Ice the water tank for testing ship models and marine engineering structures containing ice chamber filled with liquid the Cup separated from the work area and dock part, chillers with cooling system of the ice chamber, the system of preparation of the ice field, the drain water from the ice and a tow truck when the second area of the working area of the pool and made with the possibility of changing the height of his ascent above the base of the pool, when this movable bottom contains overlapping pass-through window to bypass the water, and on top of its surface covered with a material having adhesion to ice less than 30 kPa, with the edge of the rolling bottom from the dock part has a protective barrier-rib, the height of which exceeds the doubled thickness of the created ice fields, and the rest of the edges along the perimeter of the work area is equipped with a device to create a waterproofing cracks between the edges of the rolling of the day and the walls of the pool and open education-shaped container on the movable bottom, which filled the water NaCl solution for growing ice fields.

2. Method of creating an ice field in the fluid-filled bowl of the water tank, comprising introducing into the bowl of the seed in the form of ice crystals, creating a temperature regime for the formation of the ice field and control its thickness, characterized in that the pool is filled with fresh water, and ice are grown from the additional insertion of a water NaCl solution, which is first cooled fresh water to a temperature of 4oC, and then cool the surface layer to a temperature of 0.5oC, then cooled surface layer of water in a CR is AMI, and carry out waterproofing cracks between the edges of the rolling walls and bottom of the Cup and the closure through the Windows, forming on its surface an open trough-shaped container, which is grown ice field, for which it creates a layer of water NaCl solution of a given concentration of a height corresponding to the thickness of the formed ice fields, which first vyholodzhuyut to a temperature of 0.3-0,5oAnd then it make a seed crystal, and remaining after the formation of ice between the ice and the movable bottom remains unfrozen water salt solution is removed, and then moving the bottom lower for the education required for the experiment space after removing the waterproofing and opening the bypass box, which when reaching a movable bottom set depth then overlap.

 

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3 dwg

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