Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
  • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
  • B63B1/00—Hydrodynamic or hydrostatic features of hulls or of hydrofoils
  • B63B1/32—Other means for varying the inherent hydrodynamic characteristics of hulls
  • B63B1/40—Other means for varying the inherent hydrodynamic characteristics of hulls by diminishing wave resistance
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
  • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
  • Y02T70/00—Maritime or waterways transport
  • Y02T70/10—Measures concerning design or construction of watercraft hulls

Definitions

• the present invention relates to a method for generating and maintaining a gas-water mixture in the bow area of a ship, and to arrangements for carrying out the method.
• a disadvantage of this method or devices is that they are unable or only incompletely able to reach a substantial part of the ship, namely the bow area.
• air bubbles lose their effectiveness as they rise due to an increase in volume, so that the effects to be observed are small, and ship hulls equipped in this way have not found their way into practice.
• the method is based on the consideration of reducing the displacement work of a moving ship by the fact that the bow of the ship does not have to displace a water wedge, as in the known methods or in the devices, but in a per ⁇ maneuver air-water mixture area.
• the division work that was previously to be carried out by the ship's castle will in part be taken over by the air-foam mixture in the specified space in front of the ship's bow.
• guide plates are located in front of the bow of the ship and can embrace the hull to the rear up to the area of the largest ship width.
• the baffles are first laminar smoothed by the baffles. For this flow, air is released in the form of gas bubbles which are as fine as possible from the top and bottom of the baffles, producing a fine-particle foam. Because the baffles are staggered in height and each is connected to a separate pressure source, fine-pressure gas bubbles are supplied to each pressure stage.
• the gas bubbles grow in proportion to the decrease in pressure and leave the area of the ship's hull from a size dependent on the cruising speed and rise relatively quickly;
• the guide plates at least partially upstream of the ship's bow and surrounding it also have another effect of dampening the pounding of a ship. It goes without saying that the use of such devices, in particular in river navigation, brings significant relief to the river waters. On the one hand, the reduction in friction reduces fuel consumption and the bow wave, and on the other hand, the contaminated water is enriched with atmospheric oxygen, as a result of which, among other things, suspended matter and dissolved substances are oxidized in a known manner.
• the guide plates are hollow bodies, the upper and lower sides of which have air outlet openings with corresponding diameters.
• the distance between the epidermis and the hypodermis can be designed to be small in order to increase the forehead resistance little. This way of dispensing the air bubbles has the advantage of less vortex formation compared to the arrangement of separate nozzles of simple sheets.
• the baffles can consist of static Grün ⁇ have the a curved or angled cut Quer ⁇ * This also an alignment of the gas bubbles toward the center stream is additionally achieved back and to the side ab ⁇ flowing gas losses limited.
• the guide plates can in principle be firmly connected to the ship's hull at the bow, but for reasons of strength it is proposed to connect the guide plates to the latter via struts and thus to stiffen the structure.
• the guide plates can be articulatedly connected to the bow of the ship.
• this has the advantage that, depending on the speed, an upward or downward component of the flow can be generated by setting an angle of attack with respect to the water line in order to specifically target areas of the hull; he follow. All that is necessary to do this is to provide the guide plates preferably with actuators separately and to operate them in a computer-controlled manner depending on the speed and / or the corrugation;
• FIG 1 shows an arrangement according to the invention in side view with baffles
• Figure 2 shows this in plan view with guide plates
• Figure 3 shows a desired version in frontal view
• FIG. 4 shows a baffle
• FIG. 5 shows a top view of a further arrangement according to the invention which is equipped with pipes
• FIG. 1 shows a hull (1) with its bow (2); Four baffles (3, 4, 5, 6) are arranged on this, aligned approximately parallel to the water line (12).
• the guide plates are of unequal length here, the lowest (6) being the longest and the top (3) being the shortest. The exact conditions have to be optimized in the application, since ship hulls have very different designs and can therefore flow around in very different ways.
• Outlet openings for the compressed air (or another gas) are arranged on the underside of the guide plates (3 - 6).
• Each of the baffles is included connected to its own pressure source (D), so that both the gas pressure and the amount of gas applied can be varied.
• the baffles (3 - 6) can be arranged cantilevered on the bow (2), but it is suggested to connect them with the help of struts (8, 10, 11) (see also Figure 3), the baffles (3 - 6) are intercepted in FIG. 1 by the strut (11) on the bow (2) indicated by the broken line;
• the struts (8) which are arranged on both sides (also indicated by dashed lines in FIG. 1) serve to stiffen the composite at the side.
• FIG. 2 shows a schematic top view of the hull (1).
• the guide plates (3 - 6) are fastened one above the other on the bow (2). As shown, these can overlap the bow (2) and extend into the largest areas of the ship's hull (1) shown here;
• FIG. 3 the arrangement of the baffles is seen from the front.
• the middle wall (9) which, as can be seen from FIG. 4, is equipped as a hollow body with air outlet openings, as well as frame struts (8) and one if necessary head strut to be provided (10).
• the baffles (3 - 6) are curved towards the sides or, as shown, angled at an angle in order to prevent the air bubbles flowing with the water from escaping laterally on the baffles. It goes without saying that both the inclination and the number of the guide plates as well as their dimensioning have to be adapted to the type of ship.
• FIG. 4 shows that the baffles are preferably hollow, the cavity (14) being connected to the respective gas pressure source.
• the epidermis (15) and the epidermis (16) are connected to each other via plates (17) for stiffening, the outlet openings (7) for the gas are accommodated in the epidermis and epidermis.
• the diameters of the outlet openings are relatively small in order to produce gas bubbles as small as possible, from which a surprisingly stable foam is formed, particularly in salt water.
• the diameter of the outlet openings can also be varied over the height and / or the length.
• FIG. 5 shows an embodiment of the arrangement which has tubes through which air or gas is conducted into the space in front of the bow.

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• Physics & Mathematics (AREA)
• Fluid Mechanics (AREA)
• Chemical & Material Sciences (AREA)
• Engineering & Computer Science (AREA)
• Combustion & Propulsion (AREA)
• Mechanical Engineering (AREA)
• Ocean & Marine Engineering (AREA)
• Aeration Devices For Treatment Of Activated Polluted Sludge (AREA)
• Vibration Prevention Devices (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=6385569

Family Applications (1)

Country Status (3)

Cited By (1)

Families Citing this family (1)

Citations (6)

Family Cites Families (9)

• 1989
  • 1989-07-21 DE DE3924204A patent/DE3924204A1/de active Granted
• 1990
  • 1990-07-19 WO PCT/DE1990/000545 patent/WO1991001248A1/de unknown
  • 1990-07-19 AU AU59545/90A patent/AU5954590A/en not_active Abandoned

Patent Citations (6)

Non-Patent Citations (1)

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