JP2011178222A - Ship - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To further improve performance for assisting the propulsive force of a ship in a ship with a propeller provided on a stern part. <P>SOLUTION: The ship includes the propeller 3 provided on the stern part 2, a circular duct 5 which is arranged above central positions X of stern vertical vortexes S generated on the front side of the propeller 3 and on the stern part 2 and which has a diameter increasing toward the front side from the rear side of the ship, and main fins 6 extending between both lower ends of the duct 5 and a side surface of the stern part 2 in the radial direction of the propeller 3 and inclining upwardly toward the front side from the rear side of the ship. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a ship having a propeller provided at a stern part.

  A technique for arranging a circular duct in front of a propeller is known in order to reduce the required output of the ship.

  The circular duct opens from the rear to the front of the ship and is formed into a wing cross-sectional shape that protrudes radially inward of the propeller, thereby producing the effect as a wing and generating thrust. By assisting the propulsive force of the ship with the duct, it becomes possible to reduce the required thrust of the ship.

  However, there is a problem that thrust cannot be obtained in the lower half of the circular duct and the lower half of the circular duct causes an increase in resistance, and a semicircular duct having only the upper half has been proposed (Patent Document 1). 2).

Japanese Patent Laid-Open No. 2003-11880 JP 2008-308023 A

  However, even in a semicircular duct, there is a problem that thrust is mainly generated in the upper part and no thrust is generated in the side part. That is, there is a problem that thrust cannot be obtained at the side portion of the semicircular duct, and the side portion of the semicircular duct causes an increase in resistance.

  Therefore, an object of the present invention is to further enhance the performance of assisting the propulsion power of the ship.

  In order to achieve the above-mentioned object, the present invention is provided with a propeller provided at the stern part and a front position of the propeller and above the center position of the stern vertical vortex generated at the stern part. The arc-shaped duct expanded in diameter and the main propeller that extends in the radial direction of the propeller between the lower ends of the duct and the side surfaces of the stern part, and inclines forward from the rear to the front. It is equipped with fins.

  The main fin may further include auxiliary fins that extend from the radially outer end of the propeller to the outer side in the radial direction of the propeller and are inclined forward and downward from the rear of the ship toward the front.

  According to the present invention, there is an excellent effect that the performance of assisting the propulsive force of the ship can be further enhanced.

FIG. 1 is a perspective view of a main part of a ship according to an embodiment of the present invention. FIG. 2 is a rear view of the ship according to the embodiment of the present invention. FIG. 3 is a side view of an essential part of a ship according to an embodiment of the present invention. 4A is a cross-sectional view taken along line AA in FIG. 2, FIG. 4B is a cross-sectional view taken along line BB in FIG. 2, and FIG. 4C is a cross-sectional view taken along line CC in FIG. FIG. 4D is a cross-sectional view taken along the line DD of FIG. 5 (a) to 5 (d) relate to another embodiment, and are cross-sectional views corresponding to FIGS. 4 (a) to 4 (d), respectively.

  DESCRIPTION OF EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

  As shown in FIGS. 1 to 3, the ship 1 according to the present embodiment includes a propeller 3 provided on the stern part 2. The propeller 3 is rotatably provided at the tip of a stern tube 4 that is provided in the stern portion 2 and protrudes rearward of the ship.

  As shown in FIGS. 2 and 3, the ship 1 according to the present embodiment is disposed in front of the propeller 3 and above the center position X of the stern vertical vortex S generated in the stern part 2, and forward from the rear of the ship. The arc-shaped duct 5 having a diameter expanded toward the front, and both the lower end portions of the duct 5 and the side surfaces of the stern portion 2 extend in the radial direction of the propeller 3 so as to rise forward from the rear toward the front. A pair of inclined main fins 6 is provided.

  In this embodiment, the duct 5 is formed in a blade cross-sectional shape that protrudes radially inward of the propeller 3 (see FIG. 4A). In addition, the duct 5 is formed in an arc shape that protrudes upward in a rear view and has a radius smaller than the radius of the propeller 3. Further, the duct 5 is disposed above the axis O of the propeller 3 and on the inner side in the ship width direction from the center position X of the stern vertical vortex S.

  In this embodiment, the main fin 6 is formed in the blade | wing cross-sectional shape convex downward (refer FIG.4 (b) and FIG.4 (c)). The main fin 6 also serves as a stay that supports the duct 5, and the duct 5 is supported by the stern tube 4 by the main fin 6. That is, in the present embodiment, one end of the main fin 6 is fixed to the lower end portion of the duct 5, and the other end of the main fin 6 is fixed to the stern tube 4. Further, the main fin 6 is disposed on the inner side in the ship width direction with respect to the center position X of the stern vertical vortex S, and extends obliquely upward from the stern tube 4 in a rear view.

  Furthermore, the boat 1 according to the present embodiment extends from the end of the main fin 6 on the outer side in the radial direction of the propeller 3 (that is, one end of the main fin 6) to the outer side in the radial direction of the propeller 3, and forward from the rear of the boat to the front. A pair of auxiliary fins 7 that are inclined forward and downward are provided.

  In the present embodiment, the auxiliary fins 7 are formed in a blade cross-sectional shape that protrudes upward (see FIG. 4D). The auxiliary fins 7 are disposed on the outer side in the ship width direction with respect to the center position X of the stern vertical vortex S, and extend obliquely upward from the end of the main fin 6 in a rear view.

  Next, the operation of this embodiment will be described.

  When the flow field behind the hull is measured, as shown in FIG. 2, there are two stern vertical vortices S that are substantially symmetrical. Each stern vertical vortex S flows from the outside in the radial direction of the propeller 3 above the center position X of the stern vertical vortex S, and from the inside in the radial direction of the propeller 3 below the center position X of the stern vertical vortex S. Flowing. Due to the cross-sectional shape of the duct 5 that is expanded from the rear to the front of the ship, the duct 5 generates thrust when receiving a flow from the outside to the inside of the duct 5, while the flow from the inside to the outside of the duct 5. When received, the duct 5 does not generate thrust and increases resistance.

  In the present embodiment, the duct 5 whose diameter is increased from the rear to the front of the ship is disposed above the center position X of the stern vertical vortex S. The duct 5 receives a flow from the radially outer side to the inner side of the propeller 3 (that is, a flow from the outer side to the inner side of the duct 5) to generate thrust, and a flow from the radially inner side to the outer side of the propeller 3 (that is, Further, the resistance is not increased by receiving the flow from the inside to the outside of the duct 5), so that the thrust can be generated more efficiently.

  Further, in the present embodiment, the main fins 6 that extend between the lower end portions of the duct 5 and the side surfaces of the stern portion 2 in the radial direction of the propeller 3 and incline forward from the rear of the ship to the front are provided. The ship 1 is configured. Since the main fin 6 can obtain auxiliary thrust from the flow (downflow) flowing from the upper side to the lower side inside the duct 5, it can efficiently generate thrust and does not increase resistance. .

  Furthermore, in the present embodiment, auxiliary fins 7 that extend from the radially outer end of the propeller 3 in the main fin 6 to the outer side in the radial direction of the propeller 3 and are inclined forward and downward from the rear of the ship are provided. A ship 1 is configured. Since the auxiliary fin 7 can obtain the auxiliary thrust from the flow (upward flow) flowing from the lower side to the upper side of the duct 5, the auxiliary fin 7 can efficiently generate a thrust and does not increase the resistance. .

  The preferred embodiments of the present invention have been described above. However, the present invention is not limited to the above embodiments, and various other embodiments can be adopted.

  For example, in the above embodiment, the main fin 6 and the auxiliary fin 7 are formed in a blade cross-sectional shape, but the present invention is not limited to this, for example, in FIGS. 5 (b) to 5 (d). As shown, it may be formed in a flat plate shape. That is, the main fin 6 may be any one that inclines forward from the rear to the front of the ship, and both the upper surface and the lower surface of the main fin 6 may be flat (FIGS. 5B and 5B). c)). Moreover, the auxiliary fin 7 should just incline in the front downward from the back of a ship, and both the upper surface and lower surface of the auxiliary fin 7 may become a plane (refer FIG.5 (d)). However, although it is conceivable that the duct 5 is also formed in a flat plate shape, the duct 5 has a blade cross-sectional shape as shown in FIG. It is preferable to form.

1 Ship 2 Stern 3 Propeller 4 Stern Tube 5 Duct 6 Main Fin 7 Auxiliary Fin

Claims (2)

  A propeller provided at the stern part, an arcuate duct arranged in front of the propeller and above the center position of the stern vertical vortex generated in the stern part, and having a diameter increased from the rear to the front of the ship; A ship provided with main fins that respectively extend in the radial direction of the propeller between both lower ends of the duct and the side surface of the stern part and incline forward from the rear of the ship toward the front.   The marine vessel according to claim 1, further comprising auxiliary fins that respectively extend from the radially outer end of the propeller in the main fin to the outer side in the radial direction of the propeller and are inclined forward and downward from the rear of the vessel. .

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