JP6108600B2 - Wave propulsion performance improvement device and ship - Google Patents

Description

  The present invention relates to a wave propulsion performance improving device that reduces a flow rate of a fluid into a propeller surface and a ship equipped with the wave propulsion performance improving device.

  In the propeller attached to the stern of the hull, the flow of water in the direction of the captain on the bottom of the propeller is fast when descending and slow when rising. If the velocity of the fluid flowing into the propeller surface is large, the wake coefficient (1-w) is large and the propulsion efficiency in the waves is reduced.

  In Patent Document 1, even if the inclination angle of the bottom surface of the stern bottom is set to be considerably large, the flow of water along the bottom surface of the bottom of the stern can be smoothly guided during navigation, which hinders the flow into the pod propeller. There has been proposed a pod propeller ship with a propulsion performance improving device which is not provided, and a movable fin provided at the front end of the bottom surface of the ship bottom is disclosed.

  Further, in Patent Document 2, a plurality of wings are arranged in the pod portion so as to have a predetermined angle of attack with respect to the surrounding propeller water flow, and lifts are generated by these wings so that the wings move forward in the traveling direction of the ship. There has been proposed a contrapod propulsion device that generates a propulsive force in a direction.

  Moreover, in patent document 3, it is proposed to install a fin under a stern water line, and the stern vortex is eliminated or reduced.

  Further, in Patent Document 4, a first rectifying fin is attached to a submerged position below the inundation line on the ship side so as to extend from the rear end of the ship side parallel portion toward the stern, and the ship side parallel is near the ship bottom on the ship side. A second rectifying fin is attached at an intermediate position between the rear end of the section and the stern so as to rise gently toward the stern. Then, the downward flow from the ship side parallel portion is rectified by the first rectifying fin and guided to the stern side, and the upward flow from the bottom is rectified by the second rectifying fin and guided to the stern side.

  Further, in Patent Document 5, a fin having a length of 2.5 to 10% of the length of the captain is within a range of within 30% of the length of the ship from the position just before the propeller of the hull toward the bow, and the bow side mounting position is the draft from the bottom of the ship. A line where the stern side installation position is 0 to 5% high, the stern side installation position is from the bottom of the ship to 15% of the draft, and the line connecting the fin's bow side and stern side installation positions gradually rises toward the stern. In addition, a ship has been proposed in which the fins are mounted so as to project obliquely downward from the ship side so that the wing tips of the fins are approximately the same height as the ship bottom.

JP 2005-280709 A JP 2004-249874 A JP 59-50889 A JP-A-11-255178 JP 2002-137789 A

  Patent Document 1 does not prevent a decrease in propulsion efficiency due to an increase in the flow rate of fluid into the propeller surface when the hull is lowered, and therefore, the fins are not changed by raising and lowering the hull. When entering the dock, the fins are moved to be horizontal and stored above the bottom of the ship.

  The blades in Patent Document 2 are arranged on the downstream side of the propeller, and do not directly affect the inflow speed of the fluid to the propeller surface.

  The fins in Patent Document 3 to Patent Document 5 are fixed and are not changed by raising and lowering the hull.

  The present invention provides a wave propulsion performance improving device and a wave propulsion performance improving device capable of reducing the inflow speed of a fluid to the propeller surface when the hull descends and improving the propulsion efficiency in the wave. With the goal.

In the wave propulsion performance improvement device corresponding to the present invention described in claim 1, a propeller attached to the stern of the hull, a movable appendage provided in front of the propeller and operating in accordance with the movement of the hull, and a movable type A movable addend control means for controlling the movement of the addendum is provided. The movable addend control means is provided on the hull so that the movable addend can be rotated by the hinge means, and the pivot shaft of the hinge means is movable. It is constructed by placing it behind the center of gravity of the mold appendage, and the propeller surface is driven by the operation of the movable appendage by rotating the rear end of the movable appendage downward by the upward force acting on the center of gravity when the hull descends. It is characterized in that the flow rate of the fluid into the water is reduced. According to the first aspect of the present invention, the movable appendage can be operated in accordance with the descending motion of the hull, and the inflow speed of the fluid to the propeller surface when the hull descends can be reduced, and the inflow of the fluid to the propeller surface The propulsion efficiency in the waves can be improved by reducing the speed.

  According to a second aspect of the present invention, in the wave propulsion performance improving device according to the first aspect, the movable appendage projects from the outer edge of the propeller surface when the hull is viewed from the rear of the stern. It is characterized by that. According to the second aspect of the present invention, a fluid flow having a low speed can be reliably guided to the left and right lower surfaces of the propeller surface.

  According to a third aspect of the present invention, in the wave propulsion performance improving device according to the first or second aspect, the movable appendage has a fin shape. According to the third aspect of the present invention, the attachment to the hull is easy, and in particular, the movable appendage is easily operated independently on the left and right sides of the hull.

  According to a fourth aspect of the present invention, in the wave propulsion performance improving apparatus according to the first or second aspect, the movable appendage is a part of a duct type shape. According to the fourth aspect of the present invention, it is possible to capture the flow in front of the propeller over a wide range and to reliably guide the low-speed fluid flow to the propeller surface.

According to a fifth aspect of the present invention, in the wave propulsion performance improving device according to the third or fourth aspect of the invention, the cross section of the movable appendage has a wing shape. According to the fifth aspect of the present invention, it is possible to reduce the fluid flow disturbance due to the movable appendage and smoothly guide the fluid to the propeller surface. In addition, the movement of the movable appendage can be improved by the lift due to the action of the fluid on the airfoil shape .

The present invention 請 Motomeko 6 wherein, in the waves in propulsion performance improvement device according to any one of claims 1 to 5, as a movable type adduct control means for limiting the rotation range of the movable die adduct A stopper means is further provided . According to the sixth aspect of the present invention, since the movable appendage operates in accordance with the ascending or descending motion of the hull, a low-speed fluid flow can be applied to the propeller surface only by limiting the rotation range by the stopper means. Can be guided reliably .

In 請 Motomeko 7 Waves propulsion performance enhancer with a ship corresponding to the invention described, characterized by being equipped with Waves propulsion performance enhancing apparatus according to any one of claims 1 to 6. According to the present invention described in claim 7 , it is possible to realize a ship that can reduce the inflow speed of the fluid to the propeller surface when the hull descends and can improve the propulsion efficiency in the waves.

According to the present invention, the movable appendage is operated in accordance with the lowering motion of the hull, the flow rate of the fluid into the propeller surface when the hull is lowered is reduced, and the propulsion efficiency when the hull is moving up and down in the waves Can be improved.

  In addition, when the movable appendage has a shape that projects from the outer edge of the propeller surface in a state where the hull is viewed from the rear of the stern, the fluid flow having a low speed can be reliably guided to the left and right lower surfaces of the propeller surface. it can.

  In addition, when the movable appendage has a fin shape, it is easy to attach to the hull, and it is particularly easy to operate the movable appendage independently on the left and right sides of the hull.

  In addition, when the movable appendage is a part of the duct type shape, the flow in front of the propeller can be captured in a wide range, and a low-speed fluid flow can be reliably guided to the propeller surface.

In addition, when the cross section of the movable appendage has an airfoil shape, the fluid flow disturbance due to the movable appendage can be reduced, and the fluid can be smoothly guided to the propeller surface. In addition, the movement of the movable appendage can be improved by the lift due to the action of the fluid on the airfoil shape .

Also, as a movable type adduct control means, in the case of further comprising a stopper means for limiting the rotation range of the movable die adduct to operate the movable mold adduct according to ascending or descending operation of the ship, Only by limiting the rotation range by the stopper means, a low-speed fluid flow can be reliably guided to the propeller surface .

Also, according to the present invention, when equipped with Waves propulsive performance improving apparatus the inlet velocity of fluid into the propeller plane during hull descending can be reduced, thereby improving the propulsion efficiency in Waves ship Can be realized.

1 is a schematic side view showing a stern of a hull equipped with a wave propulsion performance improving device according to a first embodiment of the present invention. Schematic front view of the hull as seen from the rear of the stern Schematic top view showing the stern of the hull Explanatory drawing which shows operation | movement of the movable appendage by this embodiment at the time of ship hull descending Explanatory drawing which shows operation | movement of the movable appendage by this embodiment at the time of a hull rising Explanatory drawing which shows the isoline of the fluid flow in the propeller surface (left half) when the hull is viewed forward from the rear of the stern Schematic side view showing a stern of a hull equipped with a wave propulsion performance improving device according to a second embodiment of the present invention. Schematic side view showing a stern of a hull equipped with a wave propulsion performance improving device according to a third embodiment of the present invention. Schematic side view showing a stern of a hull equipped with a wave propulsion performance improving device according to a fourth embodiment of the present invention. Schematic top view showing the stern of a hull according to a fifth embodiment of the present invention Schematic side view showing a stern of a hull equipped with a wave propulsion performance improving device according to a sixth embodiment of the present invention. Schematic front view of the hull as seen from the rear of the stern Explanatory drawing which shows operation | movement of the movable appendage by this embodiment at the time of ship hull descending Explanatory drawing which shows operation | movement of the movable appendage by this embodiment at the time of a hull rising Front schematic view of a wave propulsion performance improving apparatus according to a seventh embodiment of the present invention as viewed from the rear of the stern Side surface schematic diagram showing a wave propulsion performance improving device according to an eighth embodiment of the present invention

Below, the ship equipped with the propulsion performance improvement apparatus in the waves by embodiment of this invention is demonstrated.
FIG. 1 is a schematic side view showing a stern of a hull equipped with a wave propulsion performance improving apparatus according to a first embodiment of the present invention, FIG. 2 is a front schematic view of the hull as viewed from the rear of the stern, and FIG. It is a top schematic diagram showing the stern of the same hull. In the figure, X indicates the axis of the propeller.

The ship according to the present embodiment is provided with a movable appendage 10 in front of the propeller 2 attached to the stern of the hull 1. A rudder plate 3 is provided behind the propeller 2.
The movable appendage 10 according to the present embodiment has a fin shape. As shown in FIG. 1, the fin-shaped movable appendage 10 has a wing-shaped cross section in the flow direction, and is provided on the left and right sides of the hull 1 as shown in FIG.
As shown in FIG. 2, the movable appendage 10 has a shape protruding from the outer edge 2 a of the propeller surface of the propeller 2 when the hull 1 is viewed from the rear of the stern.

As shown in FIGS. 1 and 3, the movable appendage 10 is provided on the hull 1 so as to be rotatable by a hinge means 11. The pivot shaft of the hinge means 11 is arranged behind the center of gravity A of the movable appendage 10 (in the direction of the propeller 2). As shown in FIG. 3, the movable appendage 10 has a side edge close to the hull 1 along the stern shape in a top view, and the trailing edge is configured wider than the leading edge. ing.
As shown in FIGS. 1 and 2, at least the pivot shaft of the hinge means 11 is attached below the axis X of the propeller, and the movable addend 10 in the plain water is positioned below the axis X of the propeller. Let

The hinge means 11 according to the present embodiment includes a stopper means (movable addend control means) 12 that limits the rotation range of the movable addend 10.
The movable appendage 10 is arranged in accordance with the movement of the hull 1 because the pivot shaft of the hinge means 11 is arranged behind the center of gravity A of the movable appendage 10 (in the direction of the propeller 2).
However, the movement of the movable addend 10 is limited by the stopper means (movable addend control means) 12.

  Note that the movable addend control means may be provided as a mechanism interlocked with the hinge means 11 instead of externally attaching the stopper means 12 as shown in FIG. Further, instead of the stopper means 12, a rotation drive control means for driving and controlling the rotation of the movable appendage 10 may be used. When the rotational drive control means is used as the movable appendage control means, the pivot shaft of the hinge means 11 need not be arranged behind the center of gravity A of the movable appendage 10 (in the direction of the propeller 2). It is preferable to dispose at least the center of the movable appendage 10 in the front-rear direction.

FIG. 4 is an explanatory diagram showing the operation of the movable appendage according to this embodiment when the hull is lowered, and FIG. 5 is an explanatory diagram showing the operation of the movable appendage according to this embodiment when the hull is raised.
As shown in FIG. 4, when the hull 1 starts to descend from the flat water, an upward force is applied to the center of gravity A of the movable appendage 10, and the movable appendage 10 acts as a pivot shaft of the hinge means 11. Is rotated in a direction (clockwise in the figure) in which the rear end is downward. In addition, since the movement of the movable appendage 10 is restricted by the stopper means 12, the movable appendage 10 stops in a state of being rotated by a predetermined angle.

  As shown in FIG. 5, when the hull 1 starts to move up from the flat water, a downward force acts on the center of gravity A of the movable appendage 10, and the movable appendage 10 rotates the hinge means 11. Around the axis, it rotates in a direction (counterclockwise in the figure) in which the rear end is upward. In addition, since the movement of the movable appendage 10 is restricted by the stopper means 12, the movable appendage 10 stops in a state of being rotated by a predetermined angle.

FIG. 6 shows an isoline of fluid flow on the propeller surface (left half) when the hull is viewed from the rear of the stern, and FIG. 6A is an explanatory diagram showing the isoline when the hull descends. 6 (b) is an explanatory diagram showing an isoline when the hull is raised. In addition, the value of the isoline in a figure has shown the ratio with respect to ship speed.
In particular, when the isolines in the circles enclosed by the broken lines in the figure are compared in FIGS. 6 (a) and 6 (b), in FIG. 6 (a) showing the lowering of the hull 1, the figure showing the rising of the hull 1 is shown. It can be seen that the velocity of the fluid flow is larger on the lower surface of the propeller surface than 6 (b).

  In the present embodiment, as shown in FIG. 4, when the hull 1 starts to descend from flat water, the propeller is rotated in the waves by rotating the movable appendage 10 in the direction in which the rear end is downward. The inflow speed of the fluid to the propeller surface can be reduced with respect to the lower surface of the propeller surface where the flow of the surface becomes faster, and the wake coefficient (1-w) can be reduced and the propulsion efficiency can be improved.

In the present embodiment, since the movable appendage 10 has a shape protruding from the outer edge 2a of the propeller surface, a fluid flow having a low speed can be reliably guided to the left and right lower surfaces of the propeller surface.
In the present embodiment, the movable appendage 10 has a fin shape, so that it can be easily attached to the hull 1, and in particular, the movable appendage 10 can be operated independently on the left and right sides of the hull 1. . The independent operation of the movable appendage 10 can be easily realized by providing rotation drive control means for driving and controlling the rotation of the movable appendage 10 independently on the left and right.
Moreover, in this embodiment, the cross section of the movable appendage 10 has an airfoil shape, so that the fluid flow disturbance due to the movable appendage 10 can be reduced, and the fluid can be smoothly guided to the propeller surface. Further, by making the movable appendage 10 into an airfoil shape, even if the sliding resistance of the hinge means 11 increases with time, the movement of the movable appendage 10 can be improved by the lift due to the action of the fluid.

Further, in the present embodiment, the movable appendage 10 is provided on the hull 1 so as to be rotatable by the hinge means 11, and the pivot shaft of the hinge means 11 is arranged behind the center of gravity A of the movable appendage 10. The movable appendage 10 can be operated in accordance with the raising or lowering operation of the hull 1.
Further, in the present embodiment, the movable appendage control means is the stopper means 12 that restricts the rotation range of the movable appendage 10, so that the movable appendage 10 can be moved according to the rising or lowering motion of the hull 1. Since it operates, the fluid flow with a low speed can be reliably guided to the propeller surface only by limiting the rotation range by the stopper means 12.

In this embodiment, the movable addend control means is a rotation drive control means for driving and controlling the rotation of the movable addend 10 in place of the stopper means 12, so that the movement of the movable addend 10 is controlled. It can be operated at the optimal timing. In this case, the rotation drive control means can be adopted from various methods such as a combination of a motor and a drive mechanism, or a mechanism using hydraulic pressure or air pressure. When the rotation drive control means itself has a holding force, the function of the stopper means 12 can be fulfilled by controlling the special rotation and holding it at an appropriate position. Further, a stopper mechanism may be provided in the mechanism portion of the rotation drive control means.
The turning drive control means drives and controls the turning of the movable appendage 10 based on the detected values of the lowering and raising of the hull 1, so that the hull 1 is lowered according to the lowering and raising of the hull 1. It is possible to control the flow rate of the fluid into the propeller surface at the optimum time. Various detection means, such as a draft sensor, a sea level sensor, and an accelerometer, can be used to detect the descending and rising of the hull 1.

  Further, in this embodiment, the rotational drive control means controls the movable appendage 10 independently on the left and right sides of the hull 1, so that the left and right movable appendages are added according to the wave direction and the traveling direction of the hull 1. The object 10 can be operated independently, and the fluid on the left and right lower surfaces of the propeller surface can be set to the optimum inflow speed.

Below, the ship equipped with the wave propulsion performance improvement apparatus by the 2nd Embodiment of this invention is demonstrated.
FIG. 7 is a schematic side view showing a stern of a hull equipped with the wave propulsion performance improving device according to the embodiment. In the figure, X indicates the axis of the propeller.

The movable appendage 10a according to the present embodiment has a flat plate shape, and has a cross section in the flow direction in a square shape instead of the airfoil shape. In addition, in the movable addend 10a having a flat plate shape, the cross section of the front edge and / or the rear edge may be an arc shape or a triangle shape, and the flat plate may be a curved surface.
In the movable appendage 10a having a flat plate shape, the fluid resistance can be reduced by setting the cross section of the front edge and / or the rear edge to an arc shape or a triangle shape, or making the flat plate a curved surface.
By configuring the movable appendage 10a in a flat plate shape, it is possible to provide the movable appendage 10a that is easy to process and inexpensive.
Since other configurations and operational effects are the same as those of the first embodiment, description thereof is omitted.

Below, the ship equipped with the wave propulsion performance improvement apparatus by the 3rd Embodiment of this invention is demonstrated.
FIG. 8 is a schematic side view showing a stern of a hull equipped with the wave propulsion performance improving device according to the embodiment. In the figure, X indicates the axis of the propeller.

The movable appendage 10b according to the present embodiment has the thickest cross section in the flow direction at the position of the hinge means 11, and the leading edge and the trailing edge are thinned. For example, the cross section in the flow direction of the movable appendage 10b is divided into two isosceles triangles with the position of the hinge means 11 as the base and the front edge as the apex, and with the position of the hinge means 11 as the base and the rear edge as the apex. The shape can be an equilateral triangle. The upper and lower surfaces of the movable appendage 10b may be curved surfaces.
In the movable appendage 10b, the cross section in the flow direction is the thickest at the position of the hinge means 11, and the fluid resistance can be reduced by making the front edge and the rear edge thin.
By configuring the movable appendage 10a in a shape that combines flat plates, it is possible to provide the movable appendage 10a that is relatively easy to process and inexpensive, and that can be expected to have a function of an airfoil shape.
Since other configurations and operational effects are the same as those of the first embodiment, description thereof is omitted.

Below, the ship equipped with the propulsion performance improvement apparatus in the waves by the 4th Embodiment of this invention is demonstrated.
FIG. 9 is a schematic side view showing a stern of a hull equipped with the wave propulsion performance improving device according to the embodiment. In the figure, X indicates the axis of the propeller.

The movable appendage 10c according to the present embodiment has a flat plate shape having a predetermined thickness, and the cross section of the front edge end and the rear edge end has an arc shape.
In the movable appendage 10c, the fluid resistance can be reduced by making the cross section of the front edge and the rear edge into an arc shape.
Since other configurations and operational effects are the same as those in the first and second embodiments, the description thereof will be omitted.

Below, the ship equipped with the wave propulsion performance improvement apparatus by the 5th Embodiment of this invention is demonstrated. In addition, 5th Embodiment changes the attachment position of the hinge means 11 in 1st Embodiment, and can be applied also in 2nd Embodiment-4th Embodiment.
FIG. 10 is a schematic top view showing the stern of the hull.

  In the hinge means 11 according to the present embodiment, the pivot shaft of the hinge means 11 is arranged in front of the movable appendage 10 in the front-rear direction (in the bow direction). When the movable appendage 10 has a relatively small shape and the rotational drive control means is used as the movable appendage control means, the pivot axis of the hinge means 11 is set from the center in the front-rear direction of the movable appendage 10. May be arranged forward (in the bow direction).

Below, the ship equipped with the wave propulsion performance improvement apparatus by the 6th Embodiment of this invention is demonstrated.
FIG. 11 is a schematic side view showing a stern of a hull equipped with a wave propulsion performance improving device according to a sixth embodiment of the present invention, and FIG. 12 is a front schematic view of the hull as viewed from the rear of the stern. In the figure, X indicates the axis of the propeller.

The movable appendage 20 according to the present embodiment has a duct shape together with the fixed duct portion 21. It is preferable that the movable appendage 20 as a part of the duct type shape has a wing shape in the cross section in the flow direction. Moreover, it is preferable that the cross section of a flow direction is also an airfoil shape also about the fixed duct part 21. FIG. The movable appendage 20 is disposed below the fixed duct portion 21. The fixed duct portion 21 is attached to the hull 1 by a column 22.
As shown in FIG. 12, the movable appendage 20 has a shape protruding from the outer edge 2 a of the propeller surface of the propeller 2 when the hull 1 is viewed from the rear of the stern.

The movable appendage 20 is provided by the hinge means 11 so as to be rotatable with respect to the fixed duct portion 21, that is, with respect to the hull 1. The rotation axis of the hinge means 11 is arranged behind the center of gravity A of the movable appendage 20 (in the direction of the propeller 2).
As shown in FIGS. 11 and 12, at least the pivot shaft of the hinge means 11 is attached at the position of the propeller axis X or below the propeller axis X, and the movable addend 20 in plain water is the propeller. It is located below the axial center X of.

The hinge means 11 according to the present embodiment includes a stopper means (movable addend control means) 12 that limits the rotation range of the movable addend 20.
The movable appendage 20 is arranged in accordance with the movement of the hull 1 because the rotational axis of the hinge means 11 is arranged behind the center of gravity A of the movable appendage 20 (in the direction of the propeller 2).
However, the movement of the movable appendage 20 is limited by the stopper means (movable appendage control means) 12.

  The movable appendage control means may be a rotation drive control means for driving and controlling the rotation of the movable appendage 10 instead of the stopper means 12. When the rotational drive control means is used as the movable appendage control means, the pivot shaft of the hinge means 11 does not need to be arranged behind the center of gravity A of the movable appendage 20 (in the direction of the propeller 2). It is preferable to dispose at least the center of the movable appendage 20 in the front-rear direction.

  FIG. 13 is an explanatory diagram showing the operation of the movable appendage according to the present embodiment when the hull is lowered, and FIG. 14 is an explanatory diagram showing the operation of the movable appendage according to the present embodiment when the hull is raised.

As shown in FIG. 13, when the hull 1 starts to descend from the flat water, an upward force is applied to the movable portion gravity center A of the movable appendage 20, and the movable appendage 20 is rotated by the hinge means 11. It rotates in the direction (clockwise in the figure) in which the rear end is downward with the moving shaft as the center. In addition, since the movement of the movable appendage 20 is limited by the stopper means 12, the movable appendage 20 stops in a state of being rotated by a predetermined angle.
Note that a cover 25 is provided in a gap between the movable appendage 20 and the fixed duct portion 21 that is generated when the rear end of the movable appendage 20 is rotated downward (clockwise in the drawing). preferable.

  Further, as shown in FIG. 14, when the hull 1 starts to move up from the flat water, a downward force acts on the center of gravity A of the movable appendage 20, and the movable appendage 20 rotates the hinge means 11. Around the axis, it rotates in a direction (counterclockwise in the figure) in which the rear end is upward. In addition, since the movement of the movable appendage 20 is limited by the stopper means 12, the movable appendage 20 stops in a state of being rotated by a predetermined angle.

  In the present embodiment, as shown in FIG. 13, when the hull 1 starts to descend from flat water, the propeller is rotated in the waves by rotating the movable appendage 20 in the direction in which the rear end is downward. The inflow speed of the fluid to the propeller surface can be reduced with respect to the lower surface of the propeller surface where the flow of the surface becomes faster, and the wake coefficient (1-w) can be reduced and the propulsion efficiency can be improved.

In the present embodiment, the movable appendage 20 has a shape protruding from the outer edge 2a of the propeller surface, so that a fluid flow having a low speed can be reliably guided to the left and right lower surfaces of the propeller surface. By making the movable appendage 20 a part of the duct shape, a fluid flow having a low speed can be reliably guided to the propeller surface.
In addition, the flow in front of the propeller can be captured in a wide range at the front part of the duct-like movable appendage 20 and the fixed duct portion 21, and a low-speed fluid flow can be reliably guided to the propeller surface.
Further, in this embodiment, the cross section of the movable appendage 20 and the fixed duct portion 21 is formed into an airfoil shape, so that the fluid flow disturbance due to the movable appendage 20 and the fixed duct portion 21 is reduced, and the propeller surface is formed. Fluid can be guided smoothly.

  Further, in the present embodiment, the movable appendage 20 is provided on the hull 1 so as to be rotatable by the hinge means 11, and the pivot shaft of the hinge means 11 is arranged behind the center of gravity A of the movable appendage 20. The movable appendage 20 can be operated in accordance with the raising or lowering operation of the hull 1.

  In the present embodiment, the movable addend control means is the stopper means 12 that restricts the rotation range of the movable addend 20, so that the movable addend 20 can be moved according to the ascending or descending motion of the hull 1. Since it operates, the fluid flow with a low speed can be reliably guided to the propeller surface only by limiting the rotation range by the stopper means 12.

  Further, in the present embodiment, the movable addend control means is a rotation drive control means for driving and controlling the rotation of the movable addend 10 in place of the stopper means 12 so that the movement of the movable addend 20 is controlled. It can be operated at the optimal timing. The rotation drive control means drives and controls the rotation of the hinge means 11 based on the detected values of the lowering and raising of the hull 1, so that the hull 1 is lowered when the hull 1 is lowered and raised. The flow rate of the fluid flowing into the propeller surface can be controlled to be optimum.

Below, the ship equipped with the propulsion performance improvement apparatus in the waves by the 7th Embodiment of this invention is demonstrated.
FIG. 15 is a schematic front view of the wave propulsion performance improving apparatus according to the embodiment viewed from the rear of the stern.

The movable appendage 20a according to the present embodiment is obtained by dividing the movable appendage 20 according to the sixth embodiment into a plurality of members, and each member can operate independently.
The movable addend 20a according to this embodiment includes a first movable addend 20a1 and a second movable addend 20a2 connected to the fixed duct portion 21 by the hinge means 11, and a first movable addend 20a1. And the second movable appendage 20a2 and the third movable appendage 20a3 connected by the hinge means 11.

  According to the movable type appendage 20a according to the present embodiment, the first movable type appendage 20a1 and the second movable type appendage 20a2 can be independently operated with respect to the fixed duct portion 21, and further the third The movable appendage 20a3 can be operated with respect to the first movable appendage 20a1 and the second movable appendage 20a2.

In the present embodiment, the rotational drive control means drives and controls the first movable appendage 20a1 and the second movable appendage 20a2 independently on the left and right sides of the hull 1, so that the wave direction, frequency, The left and right first movable appendages 20a1 and the second movable appendage 20a2 can be independently operated according to the height and the traveling direction of the hull 1, and the optimal inflow of fluid at the left and right lower surfaces of the propeller surface It can be speed.
Since other configurations and operational effects are the same as those of the sixth embodiment, description thereof is omitted.

Below, the ship equipped with the wave propulsion performance improvement apparatus by the 8th Embodiment of this invention is demonstrated.
FIG. 16 is a schematic side view showing the wave propulsion performance improving apparatus according to the embodiment.
In the present embodiment, the movable appendage 10 according to the first embodiment is applied to the POD propulsion device 30, and the movable appendage 10 according to the first embodiment is replaced with the hull 1 and the POD propulsion device 30. Provided.
Since other configurations and operational effects are the same as those of the first embodiment, description thereof is omitted.
Although not described in detail, the second to seventh embodiments can also be provided in the POD propulsion device 30 instead of the hull 1.

  According to the present invention, it is possible to reduce the inflow speed of the fluid to the propeller surface by slowing the flow in the captain direction on the lower surface of the propeller when the hull descends, and to improve the propulsion efficiency. Widely applicable.

DESCRIPTION OF SYMBOLS 1 Hull 2 Propeller 2a Outer edge 10, 10a, 10b, 10c Movable appendage 11 Hinge means 12 Stopper means 20, 20a Movable appendage 21 Fixed duct part A Center of gravity X Propeller axis

Claims (7)

A propeller attached to the stern of the hull, a movable appendage provided in front of the propeller and operating in accordance with the movement of the hull, and a movable appendage control means for controlling the movement of the movable appendage, The movable addend control means is provided on the hull so that the movable addend can be rotated by a hinge means, and the pivot shaft of the hinge means is disposed behind the center of gravity of the movable addenda. And the rear end of the movable appendage is rotated downward by an upward force acting on the center of gravity when the hull is lowered , and the flow rate of the fluid into the propeller surface is controlled by the operation of the movable appendage. A device for improving propulsion performance in waves, characterized in that it has been reduced.   The in-wave propulsion performance improvement device according to claim 1, wherein the movable appendage has a shape protruding from an outer edge of a propeller surface in a state in which the hull is viewed from the rear of the stern.   The wave propulsion performance improving apparatus according to claim 1, wherein the movable appendage has a fin shape.   The wave propulsion performance improving apparatus according to claim 1, wherein the movable appendage is a part of a duct shape.   The wave propulsion performance improving device according to claim 3 or 4, wherein a cross section of the movable appendage has an airfoil shape. The wave propulsion performance improvement according to any one of claims 1 to 5, further comprising stopper means for restricting a rotation range of the movable addend as the movable addend control means. apparatus. A marine propulsion performance improving device equipped with the wave propulsion performance improving device according to any one of claims 1 to 6 .