Ship tunnel-skeg-type hull

FIELD: transport.

SUBSTANCE: ship hull has free hull and underwater hull with curvilinear boards below design waterline converting to the fore. Underwater hull has bottom with lengthwise tunnel provided with upper horseshoe-shaped surface and vertical walls extending along the ship hull under design waterline and with generating lines parallel with the ship centre line. Underwater hull cross-section profile along design waterline features maximum width at aft area. Lengthwise tunnel fore and aft ends are provided with at least one railing to turn and to be secured relative to the axis extending the are of contact between said top arched surface and vertical walls and perpendicular to the ship centre line. Every said moving railing can be retracted and released and stay at working position whereat closed zone is formed in lengthwise tunnel. Ship free hull accommodates at least one blower of air into said lengthwise tunnel.

EFFECT: better propulsive properties and navigability.

3 cl, 5 dwg

 

The invention relates to shipbuilding and relates to the design of the hull tunnel-vessels of skeg type.

Known hull tunnel type (patent RU №2302971, CL B63B 1/00, B63B 1/40, 2007) containing the above-water and underwater housing, the housing having a curved side below the designed waterline, converging to the nose, and a bottom longitudinal tunnel is made with the upper horseshoe-shaped arch and vertical walls extending along the entire hull below the designed waterline, and with generatrices parallel to a diametral plane of the vessel and the cross-sectional profile of the underwater hull at the design waterline has a maximum width in the stern.

The hull tunnel type according to the patent RU No. 2302971 taken as a prototype.

As follows from the description to the device-prototype, to reduce wave drag during movement of the vessel with a relatively high velocity of progress is the removal of negative Delta wave pressure on the underwater hull by performing in the bottom below the designed waterline longitudinal tunnel having an upper horseshoe-shaped arch and a vertical wall in cross section and forming parallel to a diametral plane of the vessel.

The disadvantage of this known of the hull is increased frictional resistance on in�ex speed. When moving the vessel from the environment in the underwater housing has a water resistance. One of the components of the resistance of the water when the vessel is superficial viscous friction resistance, depending on the magnitude of the wetted surface area of the underwater hull, speed and water density. Presents the contours of the underwater housing with the advantages obtained by reducing wave drag when the vessel is at relatively high velocities, have an increased frictional resistance at all speeds turn due to the relatively large size of the wetted surface area of the underwater hull compared to the equal-displacement and main dimensions of a similar vessel with a traditional hull shape.

The aim of the invention is the improvement of operational performance and increase ship speed by reducing the impedance of the water while the vessel is under.

This object is achieved in that in the tunnel hull-vessels of skeg type, which contains the above-water and underwater housing, the housing having a curved side below the designed waterline, converging to the nose, and a bottom longitudinal tunnel is made with the upper horseshoe-shaped arch and vertical walls extending along the entire hull below the construct�Oh the waterline and with generatrices parallel to a diametral plane of the vessel and the cross-sectional profile of the underwater hull at the design waterline has a maximum width in the stern, according to the proposed technical solution in the fore and aft ends of the longitudinal tunnel is established, at least one movable fence, each with the possibility of rotation and fixation relative to the axis extending in the area of contact of the upper horseshoe-shaped arch and the vertical longitudinal walls of the tunnel and perpendicular to a diametral plane of the vessel, with each movable fence can be in the retracted position, wherein the movable fence built on top of a horseshoe arch, and in the working position, wherein the movable fence, together with the vertical walls that form a closed region in the longitudinal tunnel, and the surface casing is installed, at least one means for injecting air into a closed region of the longitudinal tunnel.

It is advisable for the edges of the movable fences to install the seal for sealing a closed region in the longitudinal tunnel.

Also advantageously, the upper edge of each of the movable fences to install the clamps for attaching the movable fence, as in cleaned and in working on�Azaniah.

The invention is illustrated by drawings, where:

Fig. 1 is a top view of the hull tunnel-vessels of skeg type;

Fig. 2 is a longitudinal section of the hull on a diametrical plane;

Fig. 4 - cross section b-B in Fig. 2;

Fig. 4 - node A in Fig. 2 (perspective view). Movable fence in the retracted position;

Fig. 5 - node A in Fig. 2 (perspective view). Movable fence in position.

The hull contains a surface of the housing 1 above the designed waterline 2 and underwater housing 3 below the designed waterline 2. Surface of the housing 1 may be of any shape depending on the purpose of the vessel. Underwater housing 3 has a curved side 4, converging to the nose, and the bottom 5 with a longitudinal tunnel 6. Longitudinal tunnel 6 is located below the designed waterline 2 and formed with an upper horseshoe-shaped arch 7 and the vertical wall 8, forming parallel to the center plane 9 of the vessel. In Evans longitudinal tunnel 6 installed, at least one movable fence 10. Each movable fence 10 has a possibility of rotation and fixation relative to the axis 11. The axis 11 of each of the movable fences 10 passes in the area of contact of the upper horseshoe-shaped arch 7 and the vertical walls 8 and perpendicular to diametral�th plane 9 of the vessel. In upper horseshoe arch 7 12 provides a niche for the rotation of the movable fence 10. Each movable fence 10 may be in the retracted position, wherein the movable fence 10 is embedded in the upper horseshoe-shaped arch 7, and in the working position, wherein the movable fence 10, together with the vertical walls 8, form a closed region in the longitudinal tunnel. In the aft underwater housing 3 mounted propulsion devices 13, such as water-jet propulsion, as shown on the drawings. Inside surface of the housing 1 is installed means 14 for injecting air in a closed region of the longitudinal tunnel 6 channels 15.

It is advisable for the edges of moving guards 10 set of seals (not shown) for sealing a closed region in the longitudinal tunnel 6.

Also suitable on the top edge of each movable fence 10 to install the clamps 17 for additional fastening of the movable fence, as to a retracted and working positions.

The images shows the waterline 16 when creating an air cushion.

The operation of the vessel is as follows.

With a relatively small (economic) the speed of the vessel movable fence 10 is embedded in the upper horseshoe-shaped arch 7 and form a surface with minimal �soprotivlenie water. It is reasonable each movable fence 10 by means of clamps 17 further secured in a recess 12 to provide greater reliability of fastening of the movable fence 10 the operation of the vessel. In this case, the ship moves as a conventional displacement vessel propulsion through 13.

To operate the vessel at a high speed each movable fence 10 is rotated about the axis 11 in the working position. Wherein the movable fence 10 overlapping the longitudinal tunnel 6, creating, together with the vertical walls 8, a closed region. By every means 14 through the channel 15 in a closed area of the blown air from the high pressure, forming an air cushion in the longitudinal tunnel 6, which creates aerostatic force maintain. The hull of the vessel, due to the creation of an air cushion, out of the water at the waterline 16. The movement of the vessel by means of a propeller 13.

It is advisable for the edges of moving guards 10 into contact with the longitudinal walls of the tunnel 6 to install the seal (not shown) to effectively seal the enclosed area in the longitudinal tunnel 6.

It is also advisable each movable fence 10 in the working position by means of clamps 17 further secured in a recess 12 for securely�about the perception of stress in the movable enclosure 10 during movement of the vessel.

In the longitudinal tunnel 6 is almost completely air and a portion of the surface of the 4 sides out of the water by a new waterline 16, created an air bag, which considerably reduces the wetted area of the underwater body 3, thus reducing the frictional resistance of the water while the vessel is under.

This decreases displacement volume and sediment underwater housing 3, which reduces wave dispersion, due to the displacement of water when the vessel, and consequently, reduces wave resistance.

As a result the proposed tunnel hull-vessels of skeg type by creating an air cushion in the longitudinal tunnel 6 will improve performance and seaworthiness of the vessel by decreasing the resistance of the water when the vessel is at a relatively high speed, i.e. of its main components: friction drag and wave drag.

1. The tunnel hull-vessels of skeg type containing the above-water and underwater housing, the housing having a curved side below the designed waterline, converging to the nose, and a bottom longitudinal tunnel is made with the upper horseshoe-shaped arch and vertical walls extending along the entire hull below the designed waterline and with generatrices parallel to a diametrical plane�spine of the ship, a cross-sectional profile of the underwater hull at the design waterline has a maximum width in the stern, characterized in that the fore and aft ends of the longitudinal tunnel installed at least one movable fence, each with the possibility of rotation and fixation relative to the axis extending in the area of contact of the upper horseshoe-shaped arch and the vertical longitudinal walls of the tunnel and perpendicular to a diametral plane of the vessel, with each movable fence can be in the retracted position, wherein the movable fence built on top of a horseshoe arch, and in the working position, wherein the movable fence form a closed region in the longitudinal tunnel and the surface casing is set at least one means for injecting air into a closed region of the longitudinal tunnel.

2. The tunnel hull-vessels of skeg type according to claim 1, characterized in that the edges of moving guards installed seal for sealing a closed region in the longitudinal tunnel.

3. The tunnel hull-vessels of skeg type according to claim 1, characterized in that the upper edge of each of the movable fences detents for attaching the movable fences both in the retracted and working positions.



 

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