JP2008247078A - Vessel propeller and vessel - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a propeller and a vessel etc. with it capable of suppressing a drop of the lift-resistance ratio around the root of each propeller vane by relieving a stall condition owing to the peel of the flow around the vane root and achieving enhancement of the propeller efficiency. <P>SOLUTION: A flow peel decreasing member to suppress the peel of a water flow from the surface of a propeller vane is installed in the neighborhood of the root of each vessel propeller vane on its back face. Each peel decreasing member is formed from a vane-shaped member and a plate-form member and is positioned apart from the surface of the vane in the neighborhood of the vane front edge, rear edge, etc. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a marine propeller and a marine vessel, and more particularly to a marine propeller and a marine vessel that can reduce the size of a boss, reduce the weight of the entire propeller, and improve the propulsion efficiency and propulsion performance of the marine vessel.

  A marine propeller is disposed in the wake flow of the hull and has a different performance from a single propeller in a uniform flow. In order to increase the propulsion unit efficiency near the boss of this marine propeller, a propeller boss cap with fins and a propeller for a ship having a hub vortex eliminator are proposed. (For example, refer to Patent Documents 1 and 2.)

However, with current marine propellers, the blade cross-sectional shape near the propeller blade root has a large blade thickness ratio (blade thickness / cord length) to ensure strength, and when operated in the wake region at the stern of the vessel Since the inflow angle of attack to the propeller blade becomes large, the flow on the blade surface is easily separated and falls into a stalled state. Therefore, there is a problem that the lift-drag ratio (lift / drag) is greatly deteriorated and the propeller efficiency is lowered.
Japanese Examined Patent Publication No. 7-121716 JP 2002-104284 A

  The present invention has been made to solve the above problems, and its purpose is to reduce the lift-drag ratio near the propeller blade root by alleviating the stall condition due to the separation of the flow near the propeller blade root. It is intended to provide a propeller, a ship, and the like that can suppress propulsion and improve the propeller efficiency.

  In order to achieve the above object, a marine propeller according to the present invention is a separation reducing member that suppresses the separation of water flow from the surface of a propeller blade near the propeller blade root on the back of the propeller blade of the marine propeller. Are arranged. The separation reducing member is a member that suppresses the separation of water flow from the surface of the propeller blade. For example, the separation reducing member is separated from the surface of the propeller blade, but the blade member or plate formed along the surface of the propeller blade It can be formed of a member or the like.

  According to this configuration, by suppressing the separation of water flow in the vicinity of the propeller blade root and reducing the stall, the decrease in the lift-drag ratio of the propeller blade is suppressed, the torque is reduced, and the propeller efficiency is improved. In addition, since it is possible to increase the pitch ratio at the blade root while maintaining the lift-drag ratio, the boss ratio can be decreased, and further, the pitch ratio at the blade root can be increased. Therefore, the blade thickness required for the propeller blade strength is reduced, and from these aspects, the propeller weight can be reduced and the propeller efficiency can be improved.

  In other words, since the separation of the water flow can be prevented at the root portion of the propeller blade, that is, in the vicinity of the propeller boss, the separation does not occur even if the pitch of this portion is increased. Therefore, the propeller boss can be reduced by reducing the blade thickness of this portion. Therefore, the degree of freedom of the shape of the wing is increased, and the effect of reducing the weight of the wing is generated. In addition, the boss can be reduced in size and the effect of reducing the weight of the boss is generated. As a result, propulsion efficiency of the propeller is also improved, and the propulsion efficiency is improved as a whole.

  Further, in the above-described marine propeller, the separation reducing member is formed of a wing member or a plate-like member, and is separated from the surface of the propeller wing, and is disposed in the vicinity of the leading edge of the propeller wing. The separation reducing member is formed of a wing member or a plate-like member, and is arranged in the vicinity of the trailing edge of the propeller blade, being separated from the surface of the propeller blade. According to these configurations, since there is a separation reducing member formed of a blade or a flat plate in the vicinity of the front edge or the rear edge of the propeller where the water flow is easily separated, the separation is formed by a blade or a flat plate. Since peeling becomes difficult, an effect of reducing peeling can be achieved.

  Further, in the above-described marine propeller, the separation reducing member is formed of a wing member or a plate-like member, and is arranged from the vicinity of the front edge of the propeller wing to the vicinity of the rear edge, spaced from the surface of the propeller wing. If the separation reducing member is provided so as to pass all the way from the leading edge to the trailing edge in the direction of rotation of the propeller, the water flow near the blade root of the propeller blade becomes more difficult to peel off from the surface of the propeller blade, so that the effect of reducing separation is achieved. Can do.

  Furthermore, if the separation reducing member is provided with a slit in a direction intersecting the propeller rotation direction, the difference between the pressure on the surface of the propeller blade and the pressure on the side opposite to the surface of the propeller blade of the separation reducing member can be reduced. Therefore, the disturbance of the water flow at the rear end of the peeling reduction member can be reduced, the resistance of the peeling reduction member can be reduced, and an increase in propeller torque due to the addition of the peeling reduction member can be suppressed.

  In the above-described marine propeller, a plurality of the peeling reducing members are arranged in the diameter direction of the propeller. Thereby, since the force which acts on each peeling reduction member can be made small, the fixation support of a peeling reduction member becomes easy.

  In order to achieve the above object, a ship of the present invention is formed with the above-described ship propeller. With this configuration, the propulsion performance of the ship can be improved.

  In order to achieve the above object, a marine propeller performance improving method of the present invention is a method of disposing a peeling reducing member on a marine propeller. According to this method, even a propeller of a ship already in service can be easily improved with relatively simple construction, so the performance of the propeller of a ship already in service can also be improved. Can be improved.

  The ship performance improving method of the present invention for achieving the above object is a method of disposing a peeling reducing member on a propeller of a ship. According to this method, since the propeller performance of a ship already in service can be improved relatively easily, the propulsion performance of the ship can be improved even in a ship already in service.

  The ship construction method according to the present invention for achieving the above object is a method of performing a work for disposing a peeling reducing member on a propeller of a ship while adjusting the trim of the ship and floating the stern side. According to this method, it is possible to relatively easily perform the work of disposing the peeling reducing member on the propeller of the ship without entering the dock.

  The present invention can be applied not only to a fixed pitch propeller but also to a variable pitch propeller, and can also be applied to a nozzle propeller, a counter rotating propeller, a high skew propeller, and the like. That is, it can be applied to various types of marine propellers.

  According to the marine propeller and the marine vessel of the present invention, by reducing the stall condition by separation of the flow near the propeller blade root, the reduction of the lift-drag ratio near the propeller blade root is suppressed, and the improvement of the propeller efficiency is realized. it can.

  Embodiments of a marine propeller and a marine vessel according to the present invention, a marine propeller performance improving method, a marine vessel propulsion performance improving method, and a marine construction method will be described below with reference to the drawings.

  First, a marine propeller according to a first embodiment of the present invention will be described. 1 to 4 show a marine propeller 10A according to the first embodiment. In this marine propeller 10A, several (four in FIG. 1) propeller blades 2 are arranged around the propeller boss 1. In the vicinity of the propeller blade root on the back side (Back) of the propeller blade 3, a separation reducing member 3A that suppresses the separation of water flow from the surface of the propeller blade 2 is disposed. In this embodiment, a range from the position of 30% of the propeller diameter Dp to the propeller boss is adopted as the vicinity of the propeller blade root.

  This separation reducing member 3A is a member that suppresses the separation of water flow from the surface of the propeller blade 2, and is formed of a blade member as shown in FIG. 3, but is a plate-like member as shown in FIG. The formed delamination reducing member 3B may be used, and if it is formed of a plate-like member, the processing can be easily performed, so that the manufacture becomes easy.

  The separation reducing member 3A is separated from the surface of the propeller blade 2 as shown in FIG. 2, but along the surface of the back surface of the propeller blade 2, the propeller is removed as shown in FIGS. It is disposed in the vicinity of the leading edge of the wing 2.

  As the vicinity of the leading edge of the propeller blade 2, for example, when the chord (cord length) in the rotation direction R of the propeller 10A at that portion is Lpi, the front edge of the propeller blade 2 is 30% Lpi before the leading edge and behind the leading edge. A range in the range (0.0 to 0.3 × Lpi) is selected, and the peeling reducing member 3A is arranged so as to be within this range.

  According to this configuration, the water flow can be prevented from being peeled off at the root portion of the propeller blade 2, that is, in the vicinity of the propeller boss 1 of the propeller blade 2, so that even if the pitch of this portion is increased, the propeller blade 2 does not peel off. Therefore, the propeller boss 1 can be made smaller by reducing the blade thickness of this portion. Therefore, the degree of freedom of the shape of the propeller blade 2 is increased, the effect of reducing the weight of the propeller blade 2 is generated, and the propeller labs 1 can be reduced in size, and the effect of reducing the weight of the propeller bosses 1 is generated. As a result, the propulsion efficiency of the propeller 10A is also improved, and the propulsion efficiency is improved as a whole.

  Next, a marine propeller according to a second embodiment of the present invention will be described. 5 and 6 show a marine propeller 10C according to the second embodiment. In this marine propeller 10C, in addition to the configuration provided in the peeling reduction member 3Cb on the front edge of the propeller blade 2 in the vicinity of the propeller blade root on the back side of the propeller blade 3, the propeller blade 2 also has a trailing edge. A separation reducing member 3Cb that suppresses separation of the water flow from the surface is disposed. Other configurations are the same as those of the first embodiment.

  The marine propeller 10C according to the third embodiment can achieve the same effects as the marine propeller 10A according to the first embodiment. However, the peeling reducing member 3Cb is also disposed on the rear edge of the propeller 10C. Since it arrange | positions, it becomes possible to suppress peeling of a water flow not only on the front edge side but also on the rear edge side, and the water flow becomes more difficult to peel off, thereby increasing the peeling reduction effect.

  Next, a marine propeller according to a third embodiment of the present invention will be described. 7 and 8 show a marine propeller 10D according to the third embodiment. In this marine propeller 10D, the separation reducing member 3D is disposed in the vicinity of the propeller blade root on the back side of the propeller blade 3 from the vicinity of the front edge of the propeller blade 2 to the vicinity of the rear edge. Other configurations are the same as those of the first embodiment.

  In the third embodiment, since the separation reducing member 3D is provided so as to pass through from the front edge to the rear edge in the rotation direction R of the propeller 10C, the water flow in the vicinity of the blade root of the propeller 2 blade is propeller blade. Since it becomes more difficult to peel off from the surface of 2, the peeling reduction effect can be produced. However, in the case of full passage, the weight of the peeling reducing member increases as compared with the case of providing only in the vicinity of the front edge or only in the vicinity of the rear edge.

  Next, a marine propeller according to a fourth embodiment of the present invention will be described. 9 and 10 show a marine propeller 10E according to the fourth embodiment. In this marine propeller 10E, in the configuration of the marine propeller 10D according to the third embodiment, the peeling reduction member 3E is further irradiated in a direction intersecting the propeller rotation direction R, for example, a radiation centering on the propeller rotation axis. Directional slits 3Es are provided. 9 and 10, the slits 3Es are provided at two locations with respect to the rotation direction R of the propeller 10E.

  According to the fourth embodiment, in addition to the operational effects of the third embodiment, the difference between the pressure on the surface of the propeller blade 2 and the pressure on the side opposite to the propeller blade surface of the separation reducing member 3E is reduced. Therefore, the disturbance of the water flow at the rear end of the peeling reduction member 3E can be reduced, the resistance of the peeling reduction member 3F can be reduced, and an increase in propeller torque due to the addition of the peeling reduction member 3E can be suppressed.

  Next, a marine propeller according to a fifth embodiment of the invention will be described. 11 to 13 show a marine propeller 10F according to the fifth embodiment. In this marine propeller 10F, a plurality of separation reducing members 3F that suppress the separation of water flow from the surface of the propeller blades 2 are provided in the vicinity of the propeller blade roots on the back side of the propeller blades 2 (Back) (FIGS. 5 and 6). 3). Other configurations are the same as those of the first embodiment.

  The marine propeller 10F according to the fifth embodiment can achieve the same effect as the marine propeller 10A according to the first embodiment, but further includes a plurality of separation reducing members 3F in the diameter direction of the propeller 10A. Since they are arranged individually, the force acting on each separation reducing member 3F can thereby be reduced, and the separation reducing member 3F can be fixed and supported easily. Although not particularly illustrated, this configuration can be applied not only to the first embodiment but also to the second to fourth embodiments.

  And the ship of embodiment of this invention is provided with said propeller 10A, 10C, 10D, 10E, 10F for ships. With this configuration, the propulsion performance of the ship can be improved.

  Moreover, the performance improvement method of the ship propeller of embodiment of this invention is a method of arrange | positioning the peeling reduction members 3A-3F in the propellers 10A, 10C, 10D, 10E, and 10F of the ship. According to this method, even a propeller of a ship already in service can be easily improved with relatively simple construction, so the performance of the propeller of a ship already in service can also be improved. Can be improved.

  The ship performance improving method according to the embodiment of the present invention is a method of disposing the peeling reducing members 3A to 3F on the propellers 10A, 10C, 10D, 10E, and 10F of the ship. According to this method, since the propeller performance of a ship already in service can be improved relatively easily, the propulsion performance of the ship can be improved even in a ship already in service.

  Further, in the ship construction method according to the embodiment of the present invention, the work for arranging the separation reducing members 3A to 3F on the propellers 10A, 10C, 10D, 10E, and 10F of the ship is adjusted by adjusting the trim of the ship. This is a method that floats the side. According to this method, it is possible to relatively easily perform the work of disposing the peeling reducing member on the propeller of the ship without entering the dock.

  The present invention can be applied not only to a fixed pitch propeller but also to a variable pitch propeller, and can also be applied to a nozzle propeller, a counter rotating propeller, a high skew propeller, and the like. That is, it can be applied to various types of marine propellers.

It is a figure which shows the propeller of 1st Embodiment which concerns on this invention. FIG. 3 is a schematic diagram showing a front position in the rotation direction of the propeller, showing a mounting position of the peeling reducing member in FIG. 2. It is typical sectional drawing along the rotation direction of the propeller which shows the attachment state of the peeling reduction member of FIG. It is typical sectional drawing along the rotation direction of the propeller which shows the attachment state of another peeling reduction member of FIG. It is a figure which shows the propeller of 2nd Embodiment which concerns on this invention. It is typical sectional drawing along the rotation direction of the propeller which shows the attachment state of the peeling reduction member of FIG. It is a figure which shows the propeller of 3rd Embodiment which concerns on this invention. It is typical sectional drawing along the rotation direction of the propeller which shows the attachment state of the peeling reduction member of FIG. It is a figure which shows the propeller of 4th Embodiment which concerns on this invention. It is typical sectional drawing along the rotation direction of the propeller which shows the attachment state of the peeling reduction member of FIG. It is a figure which shows the propeller of 5th Embodiment which concerns on this invention. It is the typical figure which looked ahead of the rotation direction of the propeller which shows the attachment position of the peeling reduction member of FIG. It is typical sectional drawing along the rotation direction of the propeller which shows the attachment state of the peeling reduction member of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Propeller boss 2 Propeller wing | blade 3A-3F Peeling reduction member 10A, 10C-10F Propeller

Claims (10)

  A marine propeller in which a separation reducing member that suppresses separation of a water flow from the surface of a propeller blade is disposed in the vicinity of the propeller blade root on the back surface of the propeller blade of the marine propeller.   2. The marine propeller according to claim 1, wherein the separation reducing member is formed of a wing member or a plate-like member, and is disposed in the vicinity of a front edge of the propeller blade, spaced from the surface of the propeller blade.   The marine propeller according to claim 1 or 2, wherein the separation reducing member is formed of a wing member or a plate-like member, and is disposed in the vicinity of the trailing edge of the propeller wing so as to be separated from the surface of the propeller wing.   2. The marine propeller according to claim 1, wherein the separation reducing member is formed of a wing member or a plate-like member, and is disposed from the vicinity of the front edge of the propeller blade to the vicinity of the rear edge thereof, spaced from the surface of the propeller blade.   The marine propeller according to claim 4, wherein the separation reducing member is provided with a slit in a direction intersecting the propeller rotation direction.   The marine propeller according to claim 1, 2, 3, 4, or 5, wherein a plurality of the peeling reducing members are arranged in a diameter direction of the propeller.   A ship provided with the marine propeller according to claim 1, 2, 3, 4, 5 or 6.   A method for improving the performance of a marine propeller, wherein a separation reducing member is disposed on the propeller of the marine vessel.   A method for improving the propulsion performance of a ship, in which a separation reducing member is disposed on the propeller of the ship.   A construction method for a ship in which a peeling reduction member is disposed on a propeller of the ship by adjusting the trim of the ship and floating the stern side.

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