KR100544899B1 - The type of ship with airpoil-fin - Google Patents

Abstract

The present invention relates to a linear, which is equipped with an airfoil-type fin, in particular, to reduce the receiving area of the hull causing the viscous resistance during the propulsion of the ship to improve the propulsion efficiency, to suppress the horizontal yaw during operation and It is to provide a chine linear equipped with an airfoil fin on the CHINE LINE to secure stability and to reduce maintenance costs. The high speed vessel having 20 knots or more has a width a and b of a≥b starting at the line 10, and an inclination angle Ø of 3 degrees to 10 degrees. In ships with less than 20 knots in which the line 20 is formed in the hull left and right ships and

The airfoil fins 20 of which a triangle (a) and a height (b) are a <b and the inclination angle (Ø) of 3 degrees-10 degrees are provided, starting from the draft in the light-down state. The above object can be achieved by including a linear, which is a vehicle having an airfoil-type fin, which is characterized by a linear, which is a vehicle having a foil-type fin.

Line, airfoil, fin, angle of inclination

Description

Linear with airfoil fins {TH TYPE OF SHIP WITH AIRPOIL-FIN}             

1 is a conventional linear front view

2 is a linear front view of the present invention.

3 is a linear side view of the present invention

4a, b is a front view of the airfoil fin of the present invention

Figure 5a, b is a comparison of the trim angle and the sinking effect of the present invention

Figure 6 is a comparison of the resistance performance effect of the present invention

<Description of Symbols for Main Parts of Drawings>

 10: CHINE LINE

 12: Repair (WATER LINE)

 20: (Air Foil Type) Pin

100: hull

        Bm: line width

  a: (pin) width

  b: height of (pin)

        Ø: (pin) angle of inclination

The present invention relates to a linear, which is a car equipped with airfoil fins, in particular, to reduce the receiving area of the hull causing viscous resistance during the propulsion of the vessel to improve the propulsion efficiency, and to suppress the horizontal yaw during operation with The present invention relates to a vehicle linear having an airfoil fin (FIN) in a CHINE LINE to secure stability and to reduce maintenance costs.

Generally, in order to improve the safety and rapidity of the ship, there is a method of installing bilge keels on both bilge parts, but this is not used as a cause of decreasing the propulsion efficiency due to the increase of the viscous resistance in small ships. Device,

There is a fin stabilizer similar to the bilge kill, but this device penetrates the hull and installs expensive machinery inside the ship, and avoids installation due to high maintenance costs.

In addition, there is an ANTI Rolling Tank (ART) for restraining sideways, but small vessels, especially fishing vessels, are not used due to lack of installation space and burden of installation cost.

In the conventional patent technology, as shown in FIG. 1, an inverted U-shaped 'wave curtain' is installed to use the waves extending in the stern direction from the bow, such as the shoulder wave of the bow, to make lateral fluctuations during high-speed operation. As a hull structure for prevention, there is a 'high-speed stable hull structure' (patent application No. 199-16198) filed on August 20, 1993 by Mitsubishi Heavy Industries in Japan, but most of them are designed to see the reaction force vector effect on the surface of the water. will be

Another conventional technology is a structure that installs a floating structure at the edge of the left and right sides of a shipboard for the management of aquaculture farms or to operate on a low-depth terrain and applied to a small ship with low resilience, filed on October 19, 2001 at Ilheung Shipbuilding Co., Ltd. Although there is a 'small ship draft reduction structure' (Utility Model Registration Application No. 2001-31936), it is configured to reduce the height under the water by installing a float below the line along the line, but these conventional techniques are used to promote the ship. Increasing the receiving area of the hull causing the viscous resistance at the time or the propulsion efficiency is reduced, and the increase in the horizontal demand during the operation with the Nether, causing problems in stability and maintenance costs.

Accordingly, the present invention has been proposed to solve the conventional problems as described above, the object of the present invention is to improve the propulsion efficiency by reducing the receiving area of the hull causing viscous resistance during the propulsion of the ship, It is to provide a linear, which is a car with an airfoil-type fin, which is suitable for securing stability and reducing maintenance costs by suppressing sideways during operation.

In order to achieve the above object, the vehicle linear having the airfoil-type fin according to an embodiment of the present invention is a high speed ship of 20 knots or more in which a lane line is formed in the hull left and right, starting from the lane line. Width a and height b of 2 are a≥b, and an airfoil fin having a right triangle shape having an inclination angle Ø of 3 degrees to 10 degrees is provided; In ships of less than 20 knots with a hull line formed on the hull side and right side, a straight triangle having a width (a) and a height (b) of a <b and an inclination angle (Ø) of 3 degrees to 10 degrees starting from the draft in the light tilted state It is characterized in that the technical configuration of the airfoil-type fin is provided including a linear, which is provided with a difference between the airfoil-type fin is provided.

Hereinafter, an embodiment of the present invention configured as described above, an airfoil-type fin is provided in detail with reference to the accompanying drawings. Figure 2 is a front view of the linear of the present invention, Figure 3 is a side view of the linear of the present invention, Figures 4a, 4b is a detailed front view of the airfoil fin of the present invention, Figure 5a, b is a trim of the present invention It is an angle and a sinking effect comparison figure, and FIG. 6 is a comparison of resistance performance effect of this invention.

First, the linear of the present invention shown in Figure 2 shows a vessel provided with an airfoil fin 20 on the line 10 of the hull bilge bilge portion of the hull in general, the bottom of the hull is the line 10 And the airfoil fin 20 is not provided so that the bottom surface is rounded or formed in a V shape.

In addition, Figure 3 is a side view schematically showing a line (LINES) of the present invention is provided with the line 10 extends from the bow portion to the stern portion, the upper portion of the airfoil fin 20 is formed on the bow shoulder Extends from the stern.

4A and 4B are front views showing in detail the line 10 and the airfoil fin 20 shown in FIGS. 2 and 3 of the present invention. FIG. 4A is a hull of a high speed boat having a speed of 20 knots or more. While showing the shape of the line 10 and the airfoil fins 20 connected to the waterline 5 of the cross section of the hull central part shown in the lines, the width a and the height b starting from the line 10 ) Is a≥b, and the inclination angle (Ø) is a view showing that the airfoil-shaped fin 20 of a right triangle shape having a 3 degree to 10 degree is installed.

FIG. 4B also shows the draft in the lightly loaded state located at the upper part of the lane line 10 formed in the waterline 5 of the midship cross-sectional view shown in the hull line diagram of the ship less than 20 knots. The width a and the height b is a <b, it shows that the air-foil fin 20 of the right triangular shape having an inclination angle (Ø) of 3 degrees to 10 degrees.

First, in the shape of the airfoil fins of FIGS. 4A and 4B, both the line width Bm and the width a of the airfoil fins are such that the ratio is composed of 3% to 4% of the line width Bm. In addition, the height (b) of the airfoil fins is also 2% to 3% of the line width (Bm), and the right side of the right triangle of the airfoil fins 20 of the triangular shape is provided to be parallel to the water surface. And, it is desirable to apply these shapes to ships with a total tonnage of 50 tons or less.

As a detailed description of their operation, the characteristics of the general high speed boats are that a substantial portion of the weight is supported by dynamic lift, and the dynamic pressure acting on the hull in Hangzhou is the relative velocity of the ship moving forward over a wide range of the hull surface except for the front and rear ends. As it is greater than the speed, it becomes lower than the static pressure and the buoyancy decreases, causing the hull settlement.

5A shows the change in bowing amount of the high speed linear according to the ship speed change, and the vertical axis represents the bower sinking, where the amount of hull settlement in the bow is dimensionless by the percentage (%) of the ship length (Lpp). The speed of the ship is the square root of the product of gravity acceleration and ship length. It represents the Freud Number (Fn: Froude Number),

As shown in the above diagram, the model experiments in the water tank show that the present invention continuously shows less bow syncage even if the number of Freunds (Fn: Froude Number) having no dimension of ship speed is increased.

In addition, Figure 5b shows the change in the trim angle (Trim deg.) Of the high-speed linear according to the line speed change, the horizontal axis represents the Freud Number (Fn: Froude Number), the vertical axis represents the trim angle according to the ship speed ,

As shown in the above diagram, the present invention shows that the trim angle is continuously smaller than that of the prior art even if the Freud number (Fn: Froude Number) having no dimension of ship speed is increased. Therefore, it can be seen that the present invention stabilizes the posture because the sinking and trim angles are smaller than those of the prior art even though the ship speed increases.

6 is a comparison of the resistance performance according to the ship speed of the present invention and the prior art, the horizontal axis represents the Freud number (Fn: Froude Number), the vertical axis represents the excess resistance limiting the frictional resistance at the total resistance applied to the hull As a surplus resistance index dimensioned by 2/3 power of the ship surface area and the drainage volume, etc., it shows that the resistance is improved over the entire speed range by the high speed linear airfoil fin 20 according to the present invention.

Here, large mountains appear in the resistance curve near the dimensionless ship speed Fn 0.5 because of the characteristic of the ship at high speed, the stern trim is remarkable at the same time, the whole settles, and the average draft is increased, thereby increasing the wave resistance.

As another factor to improve the resistance performance, the dynamic pressure of the lower part of the hull is increased by the airfoil fins 20 attached to the hull center at the time of the high speed boat in order to reduce the stern sinkage change and to climb the ship side. By blocking the flow of fluid, the frictional resistance and wave resistance due to the draft increase are improved.

Although the preferred embodiment of the present invention has been described above, the present invention may use various changes, modifications, and equivalents. It is clear that the present invention can be applied in the same manner by appropriately modifying the above embodiments. Accordingly, the above description does not limit the scope of the invention as defined by the limitations of the following claims.

As described above, the present invention improves the propulsion efficiency by reducing the settlement amount and trim angle of the hull causing the viscous resistance such as the wave resistance and friction resistance generated during the advance of the high-speed ship, and improves the transverse yaw during operation By suppressing, the stability of the high speed hull is secured, and maintenance costs are also reduced.

Claims (8)

In the high speed vessel of 20 knots or more in which the lane line 10 is formed in the hull left and right strings, Width (a) and height (b) a≥b starting from the line 10, characterized in that the inclination angle (Ø) of the right angle of the triangular-shaped airfoil-type fin 20 is installed Linear with airfoil fins The airfoil fin 20 of the triangular shape has a width a of 3% to 4% of a line width Bm and a height b of 2% to 3% of a line width Bm. Linear with airfoil fins, characterized in that the According to claim 1 or 2, wherein the right triangle of the airfoil-type fin 20 is linear with the airfoil-type fins, characterized in that one side perpendicular to the water surface is provided in parallel with the water surface. According to claim 1 or 2, wherein the difference is the linear is a vehicle having an airfoil fin is characterized in that the gross tonnage of 50 tons or less In ships of less than 20 knots in which the lane line 10 is formed on the hull left and right strings, The airfoil fins 20 of which a triangle (a) and a height (b) are a <b and the inclination angle (Ø) of 3 degrees-10 degrees are provided, starting from the draft in the light-down state. Difference linear with foil pins The airfoil fin 20 of the triangular shape has a width a of 3% to 4% of the line width Bm and a height b of 2% to 3% of the line width Bm. Linear with airfoil fins, characterized in that the According to claim 5 or 6, wherein the right triangle-shaped airfoil-type fin 20 is a linear with airfoil-type fins, characterized in that the right side is provided in parallel with the water surface. The linear vehicle is a vehicle having an airfoil fin, characterized in that the total tonnage of 50 tons or less.

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