JP3449981B2 - High lift rudder for ships - Google Patents

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a high lift rudder for ships.

[0002]

2. Description of the Related Art Conventionally, as shown in FIGS. 8 to 9, a high lift rudder 2 is disposed behind a propulsion propeller 1 as one means for improving the maneuverability of a ship. This high lift rudder 2 is provided with a flat plate-shaped top end plate 4 and a bottom end plate 5 projecting to the left and right sides of the rudder blade 3 at the top end and bottom end, respectively. The rudder shaft 3a is connected to the rudder blade 3 with a slightly bent shape.

The top end plate 4 and the bottom end plate 5 effectively take in the wake of the propeller propeller to the side surface of the rudder blade 3 and contribute to the rudder action. It rectifies and improves the steering effect.

The rudder blade 3 has a front edge portion 6 whose semi-circular shape is projected forward in a horizontal cross section, and a width is increased in a streamlined manner continuously with the front edge portion 6 and then toward the minimum width portion 7a. It has a shape including an intermediate portion 7 of which the width is gradually reduced and a fish tail trailing edge portion 8 of which the width is gradually increased toward the rear end 8a of a predetermined width continuously from the intermediate portion 7.

With this configuration, when the rudder blade 3 is steered, for example, to the port side, the wake of the propulsion propeller 1 is swept to the rudder blade 3.
Along the port side of the fish, and is deflected at the trailing edge 8 of the fish tail. As a result, a higher lift is generated on the rudder blade 3 as compared with a normal rudder having only a streamline shape. This pushes the rear part of the ship with more force in the starboard direction, which allows the ship to turn left in a smaller turning area.

[0006]

By the way, when the propeller rotates clockwise (rotates right) when viewed from the rear, the flux of the wake of the propeller propeller flows to the rear while rotating to the right and at the center of the flux. It is known to generate hub vortices in the line part. Since this hub vortex gives a negative thrust to the propulsion propeller, eliminating the hub vortex improves propulsion efficiency. On the other hand, if the rotational energy of the flux of the wake of the propeller is converted into a lift force by the rudder, the forward direction component of the lift force can be used as a thrust force, thus improving the propulsion efficiency.

The present invention solves the above-mentioned problems, and an object of the present invention is to provide a high lift rudder for a marine vessel configured so that the propulsion efficiency of the high rudder rudder can be increased in connection with the propulsion propeller.

[0008]

In order to solve the above problems, a high lift rudder for a ship according to the present invention according to claim 1 is arranged coaxially behind a propulsion propeller and has a top end of a rudder blade. It has a top end plate and a bottom end plate that project to the left and right sides, respectively, and the rudder blade is continuous with the front edge and the front edge that protrude forward in a semicircular shape in the contour of the horizontal section. The width of the fishtail is gradually increased toward the minimum width part, and then the width is gradually decreased toward the minimum width part. In a high lift rudder for a ship having a shape consisting of, a boss cap is provided at the leading edge of the rudder blade, and a cylindrical protrusion that opposes the boss cap of the propeller propeller on the axis of the propeller propeller with a predetermined gap between the end faces. And cylindrical projections with a continuous cylindrical surface The end surface of the cylindrical protrusion forms a convex arc surface forming a part of a circular locus about the rudder axis, and the end surface of the boss cap forms one of the circular loci about the rudder axis. Concave arc surface forming part or the end of the boss cap
The surface is a straight-cut surface.

With the above structure, since there is no space on the centerline of the flux of the wake of the propeller to generate a hub vortex due to the cylindrical projection and the subsequent rudder blade, negative thrust does not act on the propeller. The propulsion efficiency can be improved.

According to a second aspect of the present invention, a high lift rudder for a ship according to the present invention is disposed coaxially behind a propulsion propeller and has a top end plate and a bottom end plate at the top end and bottom end of the rudder blade, respectively. Then
The rudder blade has a semicircular shape that projects forward in a semi-circular shape in the contour of the horizontal cross section, and the width increases in a streamlined manner continuously to the front edge, and then gradually decreases toward the minimum width. In a high lift rudder for a ship having a shape of a fishtail trailing edge whose width is gradually increased toward the rear end of a specified width continuously from the middle part and the middle part, the top end plate and the bottom end plate are directed toward both sides. The overhanging and top end plates form a camber with a positive angle of attack in which the overhanging plate surface facing the one side where the propeller blades rotate in the ascending direction has a downward slope from the front edge toward the rear, and the bottom end plate is The overhanging plate surface facing the other port side where the propeller blades rotate in the descending direction forms a reverse camber having a negative attack angle with an upward slope from the front edge toward the rear.

With the above configuration, for example, when the propeller propeller rotates clockwise (clockwise) when viewed from the rear, the wake of the propeller propeller flows into the rudder on the starboard side of the rudder blade with a downward vector. Therefore, lift is generated in the reverse camber of the bottom end plate, and on the port side of the rudder blade, the wake of the propulsion propeller flows into the rudder with an upward vector, so lift is generated in the camber portion of the top end plate. Since these lifts have a component in the propulsion direction, the difference between the lift component and the drag component opposing the lift is a thrust that contributes to propulsion, and the propulsion efficiency can be improved.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. In the present embodiment, FIG.
9 to 9, members having the same functions as those of the conventional configuration described in FIG.

1 to 5, a high lift rudder 2 is arranged coaxially behind the propulsion propeller 1, and the top end and the bottom end of the rudder blade 3 are protruded to the left and right port sides, respectively. It has a plate 4 and a bottom end plate 5.

The rudder blade 3 has a front edge portion 6 which protrudes forward in a semicircular shape in the contour of the horizontal section, and a width which increases in a streamlined manner continuously with the front edge portion 6 and thereafter gradually increases toward the minimum width portion 7a. It has a shape including an intermediate portion 7 having a reduced width and a fishtail trailing edge portion 8 which is continuous with the intermediate portion 7 and gradually increases in width toward a rear end 8a having a predetermined width.

The front edge 6 of the rudder blade 3 is provided with a cylindrical projection 9 on the axis of the propeller propeller.
On both ends 9 of the boss cap 10 of the propeller 1
A and 10a face each other with a predetermined gap. This gap is preferably as small as possible.

The cylindrical projection 9 and the boss cap 10 have a continuous cylindrical shape on their peripheral surfaces, and the end surface 9a of the cylindrical projection 9 is part of a circular locus centered on the axial center of the rudder shaft 2a. Boss cap 1
The end surface 10a of 0 forms a concave arc surface forming a part of a circular locus centered on the axis of the rudder shaft 2a.
The end surface 10a of 0 is a straight cut surface , that is, a straight cut surface.
It is also possible to form (planar) .

In the present embodiment, description will be given below as a structure in which the propeller propeller 1 rotates clockwise (clockwise rotation) when viewed from the rear. The top end plate 4 and the bottom end plate 5 project in the port side direction. The apex plate 4 has a camber forming a positive angle of attack in which a projecting plate surface 4a facing one port side (port side) where the propeller blades rotate in an ascending direction forms a positive slope at a downward slope from the front edge toward the rear. There is. The bottom end plate 5 forms a reverse camber in which a projecting plate surface 5a facing the other port side (starboard side) where the propeller blades rotate in the descending direction forms a negative attack angle with an upward slope from the front edge toward the rear. is doing.

Although not shown, when the propulsion propeller 1 is rotated counterclockwise (counterclockwise) when viewed from the rear, the top end plate 4 has the starboard side projecting plate surface 4b rearward from the front edge. Form a camber to form a positive angle of attack toward
The reverse camber is formed so that the port side single plate surface 5b of the bottom end plate 5 forms a negative angle of attack from the front edge toward the rear.

The operation of the above structure will be described below. The wake of the propulsion propeller 1 produces a hub vortex when a water space exists at the centerline of the flux, which gives the propulsion propeller 1 a negative thrust. However, according to the present embodiment, the propeller 1
Since the boss cap 10, the cylindrical projection 9 and the rudder blade 3 themselves continuously exist, the water space does not exist at the site where the hub vortex should be generated, and the hub vortex is eliminated, so that the propulsion propeller 1 becomes negative. Propulsion efficiency is improved because thrust is not applied.

End surface 9a of the cylindrical projection 9 of the rudder blade 3
Since the end surface 10a of the boss cap 10 of the propulsion propeller 1 and the end surface 10a of the boss cap 10 each have a convex arc surface and a concave arc surface centered on the axis of the rudder shaft 2a, the cylindrical projection 9 is rotated by the rotation of the rudder blade 3. It does not interfere with the boss cap 10 of the propulsion propeller 1.

For example, as shown in FIGS. 2 to 5, when the propulsion propeller 1 rotates clockwise (rightward) when viewed from the rear, the wake of the propulsion propeller 1 rotates backward while rotating to the right. Flowing. As a result, on the starboard side of the rudder blade 3, the wake of the propulsion propeller 1 flows into the rudder blade 3 with backward and downward vectors, and this is the reverse camber of the overhang plate surface 5a on the starboard side of the bottom end plate 5. To generate lift.

On the other hand, on the port side of the rudder blade 3, the wake of the propulsion propeller 1 flows into the rudder blade 3 with a backward and upward vector, and this flows on the overhanging plate surface 4a of the top end plate 4 on the port side. It acts on the camber and generates lift.

Since these lifts have the components in the propulsion direction, they contribute to the propulsion force by the difference between these propulsion direction components and the components of the drag force that opposes them, thus improving the propulsion efficiency.

FIGS. 6 to 7 show another embodiment relating to the recovery of the propeller rotating wake energy of the present invention. In some cases, due to the shape of the stern of the ship, the flux of the wake of the propulsion propeller 1 flows backward with a strong upward vector. For such a case, as shown in FIGS. 6 to 7, a camber is formed so that both sides of the top plate 4 form a positive angle of attack from the front edge toward the rear.

The ascending wake of the propeller 1 flowing into the rudder blade 3 acts on the camber of the projecting plate surfaces 4a and 4b on both sides of the top plate 4 to generate lift. Since this lift has a component in the direction of propulsion, the difference between this component in the direction of propulsion and the drag component that opposes it contributes to the propulsion force, improving propulsion efficiency.

[0026]

As described above, according to the present invention, the hub of the propeller propeller is provided by providing the cylindrical projection on the front edge of the rudder blade so as to be continuous with the peripheral surface of the boss cap of the propeller propeller. The vortex can be eliminated to improve the propulsion efficiency, and the overhanging plate surfaces of the top end plate and the bottom end plate have positive and negative angles of attack, respectively, to reduce the rotational energy of the wake of the propeller propeller. It has the outstanding effect that it can be converted into thrust to improve propulsion efficiency.

[Brief description of drawings]

FIG. 1 is an overall partial plan view of a high lift rudder for a ship according to an embodiment of the present invention.

FIG. 2 is a side view of the high lift rudder for the ship as viewed from the starboard side.

FIG. 3 is a view of the high lift rudder for the marine vessel taken along arrow aa in FIG. 2.

FIG. 4 is a side view of the high lift rudder for the marine vessel viewed from the port side.

FIG. 5 is a bb arrow view of FIG. 2 of the high lift rudder for the same ship.

FIG. 6 is a side view of a high lift rudder for a ship according to another embodiment of the present invention as viewed from the starboard side.

FIG. 7 is a cc arrow view of FIG. 6 of the high lift rudder for the ship.

FIG. 8 is a bird's eye view showing a conventional high lift rudder for a ship.

FIG. 9 is a view showing a horizontal sectional contour of a rudder blade of the high lift rudder for the ship.

[Explanation of symbols] 1 Propulsion propeller 2 high lift rudder 2a Rudder shaft 3 rudder blade 4 top plate 4a, 4b Overhanging plate surface 5 Bottom end plate 5a, 5b Overhanging plate surface 6 front edge 7 Middle part 7a Minimum width part 8 Uo tail trailing edge 8a rear end 9 Cylindrical protrusion 9a end face 10 Boss Cap 10a end face

─────────────────────────────────────────────────── --- Continuation of the front page (56) Reference JP-A-10-297593 (JP, A) JP-A-5-39089 (JP, A) JP-A-5-39090 (JP, A) JP-A-11- 139395 (JP, A) JP-A-47-15895 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) B63H 25/38

Claims (2)

(57) [Claims] 1. A rudder blade having a top end plate and a bottom end plate, which are arranged coaxially behind a propulsion propeller and project to the left and right port sides, respectively, at the top end and bottom end of the rudder blade. In the contour of the front part, which has a semicircular shape that protrudes forward, and the width of which increases continuously in a streamlined manner, and then gradually decreases toward the minimum width part. In a high lift rudder for a ship, which has a shape of a fishtail trailing edge whose width gradually increases toward the rear end of a predetermined width, the leading edge of the rudder blade has the propeller propeller axially aligned with the propeller propeller. Cylindrical protrusions facing each other with a predetermined gap between the boss cap and the end face are provided, and the boss cap and the cylindrical protrusion are formed into a continuous cylindrical shape on the peripheral surface, and the end face of the cylindrical protrusion is the rudder shaft. Form a convex arc surface that forms part of a circular locus centered on the heart. , Arcuate surface of the concave forming part of a circle trajectory end surface of the boss cap around the steering shaft axis,
Alternatively, a high lift rudder for a ship, characterized in that the end surface of the boss cap is a straight surface. 2. A rudder blade is disposed coaxially behind a propulsion propeller, and has a top end plate and a bottom end plate at the top end and bottom end of the rudder blade, respectively, and the rudder blade is forwardly half in a horizontal cross-sectional profile. A front edge that protrudes in a circular shape and a width that continuously increases from the front edge to a streamlined shape and then gradually decreases toward the minimum width area In a high lift rudder for a ship, which has a shape of a fishtail trailing edge whose width gradually increases toward the rear end, the top end plate and the bottom end plate project toward both sides, and the propeller blades rise in the top end plate in the ascending direction. The overhanging plate surface facing one of the rotating port sides forms a camber with a positive angle of attack with a downward slope from the front edge toward the rear, and the bottom end plate is the other port side where the propeller blades rotate in the descending direction. The overhanging plate surface facing the Marine high lift rudders and forming a reverse camber forming an e corner.