KR102074570B1 - Propulsion apparatus for ship and ship - Google Patents

Abstract

(Problem) In the ship propulsion apparatus and a ship, generation | occurrence | production of hub vortex is suppressed.
(Solution means) The propeller shaft 22 which is supported so that the rear part of the ship body 12 can rotate freely, and the propeller 21 connected to the edge part in the axial direction in the propeller shaft 22 are provided, The boss 21 includes a boss 32 fixed to an end of the propeller shaft 22, a plurality of propeller blades 33 fixed to the outer peripheral portion of the boss 32 at a predetermined interval in the circumferential direction, and a propeller 21 of the propeller 21. It has the guide vane 41 formed along the rotation direction A of the propeller 21 so that it may protrude from the negative pressure surface 33a of the propeller blade 33 in the rotation center O side in radial direction.

Description

Ship propulsion device and ship {PROPULSION APPARATUS FOR SHIP AND SHIP}

This invention relates to the propulsion apparatus of the ship using a screw propeller, and the ship provided with the propulsion apparatus of this ship.

In general, a propulsion device of a ship is to obtain a propulsion force by rotating a screw propeller by a main machine. In such a ship propulsion apparatus, it is known that hub swirl occurs from a hub portion that is a support portion of a screw propeller. This hub vortex is generated by the rotation of the screw propeller and is a loss of energy. Since a ship has an adverse effect of drag generated on a screw propeller due to the induction resistance caused by the hub vortex, the ship recovers energy of the hub vortex or diffuses the hub vortex to mitigate adverse effects on thrust. For example, there exist some described in the following patent document.

Japanese Unexamined Patent Publication No. 2009-051283 Japanese Unexamined Patent Publication No. 2010-215187 Japanese Unexamined Patent Publication No. 2013-129408

What is described in each patent document mentioned above spreads the hub vortex which generate | occur | produced from the hub part of a screw propeller, and does not suppress generation | occurrence | production of the hub vortex itself. Therefore, this hub vortex may cause cavitation, the hull vibrates through the stern bottom, and erosion may occur in the propeller, adversely affecting the durability of the propeller.

This invention solves the subject mentioned above, and an object of this invention is to provide the ship propulsion apparatus and ship which suppress generation | occurrence | production of a hub vortex.

The propulsion apparatus of the ship of this invention for achieving the said objective is provided with the propeller shaft supported so that it may rotate freely in the rear part of a ship body, and the propeller connected to the edge part in the axial direction in the said propeller shaft, The said propeller Is a boss fixed to an end of the propeller shaft, a plurality of propeller blades fixed at predetermined intervals in the circumferential direction on the outer circumference of the boss, and the surface of the propeller blade on the rotation center side in the radial direction of the propeller It characterized in that it has a guide vane formed along the direction of rotation of the propeller to protrude from.

Therefore, by forming guide vanes along the direction of rotation of the propeller so as to protrude from the surface of the propeller blades, when the propeller rotates, the flow of water flowing on the surface of the propeller blades is guided in a predetermined direction by the guide vanes, It will flow along the arc. Then, when water flows on the negative pressure surface of the propeller blades and water flows on the positive pressure surface merges at the rear edges of the propeller blades, the directions of the water flows are approximated to suppress the occurrence of vortices and to suppress the occurrence of hub swirls. can do.

In the propulsion apparatus of the ship of this invention, the said guide vane is arrange | positioned in the area | region from the outer peripheral surface of the said propeller blade | wing to the position of 1/10 radius of the said propeller from the outer peripheral surface of the said boss I am doing it.

Therefore, by arranging the guide vanes at the optimum positions in the rotational direction and the radial direction of the propeller blades, the flow of water flowing on the surface of the propeller blades can be appropriately guided, and the occurrence of hub swirl can be effectively suppressed.

In the propulsion apparatus of the ship of this invention, the said guide vane is formed in at least one of the negative pressure surface side and the positive pressure surface side of the said propeller blade. It is characterized by the above-mentioned.

Therefore, by forming the guide vane on at least one of the negative pressure side or the positive pressure side of the propeller blade, the flow of water flowing through the negative pressure side or the positive pressure side of the propeller blade can be appropriately guided.

In the propulsion apparatus of the ship of this invention, the said guide vane is arrange | positioned so as to oppose the limit streamline on the wing surface in the said propeller blade.

Therefore, by arranging the guide vanes opposite the limit streamline on the wing surface, the flow of water flowing through the negative pressure side or the positive pressure side of the propeller blade can be effectively corrected.

In the propulsion apparatus of the ship of this invention, the said guide vane in any one of the negative pressure side and the positive pressure side of the said propeller blade is arrange | positioned along the marginal streamline on the wing surface which arises in either of the negative pressure side and the positive pressure side of the said propeller blade. It is characterized by.

Therefore, by arranging the guide vanes along the limit streamline on the wing surface generated on the opposite surface, the flow along the limit streamline on one wing surface of the propeller blades and the positive pressure plane side is adapted to the other flow by the guide vanes. By correcting, it is possible to effectively suppress the occurrence of hub vortex.

In the propulsion apparatus of the ship of this invention, in the intersection with the rear edge of the rotation direction of the said propeller blade in the extension line along the said guide vane formed in either one of the said negative pressure surface side and the said positive pressure surface side, in the said intersection The angle formed by the tangent of the extension line along the guide vane and the tangent of the marginal streamline on the wing surface of the other of the negative pressure surface side and the positive pressure surface side at the intersection point is set in a range of 0 to 5 degrees. I am doing it.

Therefore, by providing a margin to the attachment angle of the guide vane, the production efficiency can be improved after sufficiently securing the suppression effect of the generation of the hub swirl.

In the propulsion apparatus of the ship of this invention, the said guide vane is formed in the range of 0-5 degree with respect to the attachment surface orthogonal to the surface of the said propeller blade.

Therefore, by providing a margin to the attachment angle of the guide vane, the production efficiency can be improved after sufficiently securing the suppression effect of the generation of the hub swirl.

In the propulsion apparatus of the ship of this invention, the said guide vane is set so that the length of the direction of rotation of the said propeller blade is set longer than the length of the direction orthogonal to the surface of the said propeller blade.

Therefore, the guide vane can be set to an optimum shape according to the shape of the propeller blades.

In the propulsion apparatus of the ship of this invention, the said guide vane is formed in multiple numbers at the negative pressure surface side or the positive pressure surface side of the said propeller blade at predetermined intervals in the radial direction of a propeller.

Therefore, by forming a plurality of guide vanes on the surface of the propeller blades, it is possible to effectively suppress the generation of hub swirls.

Moreover, the ship of this invention is provided with the propulsion apparatus of the said ship. It is characterized by the above-mentioned.

Therefore, when the water flows on the negative pressure surface of the propeller blades and the water flows on the positive pressure surface merge at the rear edge of the propeller blades, the directions of the water flows are approximated to suppress the generation of vortices and to suppress the occurrence of hub swirls. can do.

According to the propulsion apparatus and the ship of the ship of this invention, since guide vane is formed along the rotational direction of a propeller so that it may protrude from the surface of a propeller blade, generation | occurrence | production of a hub vortex can be suppressed.

BRIEF DESCRIPTION OF THE DRAWINGS It is a schematic diagram which shows the stern on which the propulsion apparatus of the ship of 1st Embodiment was attached.
It is a front view which shows the propulsion apparatus of the ship of 1st Embodiment.
3 is a side view showing the propulsion device of the ship.
It is a schematic diagram which shows the water flow of the negative pressure surface side of a general propeller blade.
It is a schematic diagram which shows the water flow of the static pressure surface side of a general propeller blade.
It is a schematic diagram which shows the water flow of the negative pressure surface side of the propeller blade of 1st Embodiment.
FIG. 7 is a VIII-VIII cross-sectional view of FIG. 6.
It is a schematic diagram which shows the water flow of the negative pressure surface side of the propeller blade in the propulsion apparatus of the ship of 2nd Embodiment.
It is a schematic diagram which shows the static pressure surface of the propeller blade in the propulsion apparatus of the ship of 3rd Embodiment.
10 is a sectional view taken along line XX of FIG. 9.
It is a schematic diagram which shows the water flow of the negative pressure surface side of the propeller blade in the propulsion apparatus of the ship of 4th Embodiment.

EMBODIMENT OF THE INVENTION Below, with reference to an accompanying drawing, preferred embodiment of the ship propulsion apparatus and ship which concerns on this invention is described in detail. In addition, this invention is not limited by this embodiment, Moreover, when there exist several embodiment, it also includes what comprises each embodiment combining.

[First Embodiment]

1 is a schematic view showing a stern on which a propulsion device for a ship of the first embodiment is mounted.

As shown in FIG. 1, the ship 11 is equipped with the propulsion apparatus 14 in the stern 13 of the ship body 12 as a uniaxial ship. This propulsion device 14 includes a propeller 21, a propeller shaft 22, and a key 23.

The propeller 21 is connected to an unshown power source mounted on the ship body 12 via the propeller shaft 22. The power source is, for example, an internal combustion engine such as a diesel engine or an electric motor. The hull 12 has a boss 31 formed on the stern 13. The propeller 21 is formed of a steel plate, and is composed of the boss 32 and a plurality of propeller blades 33 (in this embodiment, four pieces). The boss 32 is formed in a circumferential shape, and a plurality of propeller blades 33 are fixed at equal intervals in the circumferential direction on the outer circumferential portion. The end of the propeller shaft 22 is connected to this boss 32, and is supported so that the boss 32 can rotate freely via this propeller shaft 22. As shown in FIG. Therefore, when the propeller shaft 22 rotates by a power source, the propeller 21 which consists of the boss 32 and each propeller blade 33 rotates, and the ship 11 can acquire propulsion force and can propel.

The key 23 is formed of a steel plate, and is disposed behind the ship body 12 (stern 13 side) rather than the propeller 21. The key 23 is provided with the rudder horn 34 and the key main body 35. The rudder horn 34 is formed in a columnar shape, is disposed along the vertical direction, and the upper end is fixed to the stern 13 of the hull 12. The key body 35 is supported so that the rudder horn 34 can be freely rotated by a key axis (not shown) along the vertical direction. The key 23 is provided with the drive device which is not shown in figure. Therefore, the propulsion direction of the ship 11 can be changed by rotating the key main body 35 by a drive apparatus.

By the way, the propulsion apparatus 14 of the ship mentioned above is comprised with the boss 32 and the some propeller blade 33, and is a boss which is a source of each propeller blade 33 during rotation. It is known that hub swirl occurs from the outer peripheral portion of (32).

4 is a schematic view showing water flow on the negative pressure surface side of a general propeller blade, and FIG. 5 is a schematic view showing water flow on the positive pressure surface side of a general propeller blade.

As shown in FIG. 4, the negative pressure surface 33a of the propeller blade 33 when the propeller blade 33 rotates in the A direction (hereinafter, the rotation direction A) with the center O as a point. ), The water flow (hereinafter, the water flow direction B) is generated in the opposite direction to the rotation direction B on the (). At this time, on the negative pressure surface 33a of the propeller blade 33, the water flowing in the water flow direction B with respect to the climbing arc circular line (single-dashed line) Ca from the center O is on the wing surface upper limit. It flows along the wired line (solid line) Fa. And on the negative pressure surface 33a of the propeller blade 33, the climbing surface circle | round | yen limiting flow path Fa toward the tip end side of the propeller blade 33 from the center O side toward the water flow direction B. It is crossing the arc Ca.

On the other hand, as shown in FIG. 5, when the propeller blade 33 rotates to A direction (hereafter rotation direction A) with the center O as a point, the positive pressure surface 33b of the propeller blade 33 is carried out. Water flow (hereinafter, the water flow direction B) is generated toward the reverse direction B from the rotation direction A on the phase. At this time, on the positive pressure surface 33b of the propeller blade 33, the water flowing in the water flow direction B with respect to the climbing arc circular line (single-dashed line) Cb from the center O is on the wing surface upper limit. It flows along the wired line (solid line) Fb. And on the positive pressure surface 33b of the propeller blade 33, the climbing surface circle | limit limiting streamline Fb toward the center O side from the front end side of the propeller blade 33 toward the water flow direction B. It is crossing the arc Cb.

Then, as shown in FIG. 4 and FIG. 5, in the rear edge 33d of the propeller blade 33, the water flow which flows along the negative pressure surface 33a of the propeller blade 33 along the blade surface upper limit streamline Fa. And the water flows flowing along the static pressure surface 33b of the propeller blade 33 along the edge surface streamline Fb on the blade surface. At this time, since the directions of the water flows are different, it is considered that vortices are generated at this confluence, and a plurality of vortices move to the outer circumferential surface side of the boss 32 to join, thereby generating a hub vortex.

FIG. 2: is a front view which shows the propulsion apparatus of the ship of 1st Embodiment, and FIG. 3 is a side view which shows the propulsion apparatus of a ship.

So, in this embodiment, as shown to FIG. 2 and FIG. 3, in the propeller blade 33, it protrudes from the surface by the rotation center (center (O)) side in the radial direction of the propeller 21. A guide vane 41 is formed along the rotation direction A of the propeller 21.

The guide vane 41 is formed on the negative pressure surface 33a side of the propeller blade 33. This guide vane 41 is located from the outer circumferential surface of the boss 32 to the position of 1/10 radius of the propeller 21 on the rear edge 33d side of the rotation direction A of the propeller blade 33. It is arranged in the area.

That is, when the blade length (length of rotation direction A) of propeller blade 33 is set to C, guide vane 41 is sheared (front end of rotation direction A of propeller blade 33) ( The position of 41a) is formed from the front edge 33c of the propeller blade 33 to the rear side of the rotation direction A of the propeller blade 33 rather than 1 / 2C (0.5C). In addition, the position of the rear end (rear end of the rotation direction A of the propeller blade 33) 41b of the guide vane 41 is smaller than that of the rear edge 33d of the propeller blade 33. It is formed in the front side of the rotation direction A of the.

In addition, when the radius from the center O to the tip of the propeller blade 33 is R and the radius from the outer circumferential surface of the boss 32 to the center position in the thickness direction of the guide vane 41 is R1, the guide is The vanes 41 are formed in a region where 1 / 10R ≧ R1 (0.1R ≧ R1).

Hereinafter, the shape, formation position, etc. of the guide vane 41 are demonstrated in detail. FIG. 6: is schematic which shows the water flow of the negative pressure surface side of the propeller blade of 1st Embodiment, FIG. 7: is VII-VII sectional drawing of FIG.

As shown to FIG. 6 and FIG. 7, the guide vane 41 is arrange | positioned so that it may face the limit streamline Fa on the blade surface in the propeller blade 33 in the negative pressure surface 33a. That is, the guide vanes 41 collide with each other on the negative pressure surface 33a without flowing along the limit streamline Fa on the blade surface of the propeller blade 33, and flow along the limit streamline Fa on the blade surface. As a result, the flow direction is arranged at an angle that changes to the center (O) side. In this case, it is preferable that the guide vane 41 sets the angle which the guide surface 41c of the center O side and the limit streamline Fa on the wing surface make to an obtuse angle.

Specifically, the guide vanes 41 formed on the negative pressure surface 33a side of the propeller blade 33 are disposed along the wing surface upper limit streamline Fb generated on the positive pressure surface 33b of the propeller blade 33. It is desirable to be. In this case, the guide vane 41 may be curved or planar. However, when the guide vane 41 is a curved surface, when the guide surface 41c is a curved surface, the guide vane 41 is made into a plane parallel to the upper limit streamline Fb on the wing surface, and when the guide surface 41c is flat, the limit streamline on the wing surface Let it be a plane parallel to the tangent of (Fb). The tangent in this case is at the rear end 41b of the guide vane 41.

Moreover, the guide vane 41 formed in the negative pressure surface 33a side of the propeller blade 33 is always arrange | positioned along the wing surface upper limit streamline Fb which arises in the positive pressure surface 33b of the propeller blade 33. There is no need to do it. For example, at the intersection (rear end 41b) with the rear edge 33d of the rotation direction A of the propeller blade 33 in the extension line along the guide vane 41 formed on the negative pressure surface 33a side. The angle formed by the tangent of the extension line along the guide vane 41 at this intersection and the tangent of the limit streamline Fb on the blade surface at the positive pressure surface 33b side at the intersection is in the range of 0 to 5 degrees. Is preferably set to. That is, the guide vane 41 formed in the negative pressure surface 33a side of the propeller blade 33 has a wing surface upper limit streamline which the guide surface 41c produces in the positive pressure surface 33b of the propeller blade 33 ( You may make it incline to 5 degree with respect to Fb) to the center side of the propeller blade 33, or incline to 5 degrees to the front end side.

In addition, the guide vane 41 is formed in the range of 0 to 5 degrees with respect to the mounting surface orthogonal to the negative pressure surface 33a of the propeller blade 33. That is, the guide vane 41 is preferably fixed at a right angle (90 degrees) with respect to the negative pressure surface 33a of the propeller blade 33, but is 85 degrees to the negative pressure surface 33a of the propeller blade 33. You may be inclined and fixed to the center side or front-end | tip side of the propeller blade 33 in the range of 95 degree | times.

In addition, the guide vane 41 has a length (height) H in a direction in which the length L of the rotation direction A of the propeller blade 33 is perpendicular to the negative pressure surface 33a of the propeller blade 33. It is preferable to set longer. That is, the guide vane 41 makes an aspect ratio (length L of the rotation direction A of the length H / propeller blade 33 of the direction orthogonal to the negative pressure surface 33a) 1.0 or more.

Moreover, although it is preferable that the guide vane 41 makes the thickness t of the radial direction of the propeller blade 33 constant in the rotation direction A of the propeller blade 33, the rotation direction of the propeller blade 33 is sufficient. You may make it thicker or thinner toward (A). In addition, it is preferable that the guide vane 41 makes the length (height) H of the direction orthogonal to the negative pressure surface 33a of the propeller blade 33 constant in the rotation direction A of the propeller blade 33. However, you may lengthen or shorten it toward the rotation direction A of the propeller blade 33. In addition, the guide vane 41 may perform the process which rounds a corner part or cuts it.

Thus, in the propulsion apparatus of the ship of 1st Embodiment, it is connected with the propeller shaft 22 supported so that the back part of the ship body 12 can rotate freely, and the edge part in the axial direction in the propeller shaft 22. The propeller 21 is provided with the propeller 21, The propeller 21 is a plurality of propeller blades which are fixed to the boss 32 fixed to the edge part of the propeller shaft 22, and the outer peripheral part of the boss 32 at predetermined intervals in the circumferential direction. And 33 are formed along the rotation direction A of the propeller 21 so as to protrude from the negative pressure surface 33a of the propeller blade 33 at the rotation center O side in the radial direction of the propeller 21. It has a guide vane 41.

Therefore, when the propeller 21 rotates by forming the guide vane 41 along the rotation direction A of the propeller 21 so that it may protrude from the negative pressure surface 33a of the propeller blade 33, the propeller blade 33 will rotate. The water flow which flows through the negative pressure surface 33a of () is guided by the guide vane 41 in a predetermined direction, and flows along the climbing-curve circular line Ca. Then, when the water flow flowing on the negative pressure surface 33a of the propeller blade 33 and the water flow flowing on the positive pressure surface 33b merge at the rear edge of the propeller blade, the direction of each water flow is approximated, and the generation of the vortex is approximated. It can suppress and generate | occur | produce hub vortex.

In the propulsion apparatus of the ship of 1st Embodiment, the guide vane 41 is a propeller 21 from the outer peripheral surface of the boss 32 on the rear edge 33d side of the rotation direction A of the propeller blade 33. It is arrange | positioned to the area | region up to the position of 1/10 radius of). Therefore, the water flow which flows on the negative pressure surface 33a of the propeller blade 33 can be guided appropriately, and generation | occurrence | production of hub vortex can be suppressed effectively.

In the propulsion apparatus of the ship of 1st Embodiment, the guide vane 41 is arrange | positioned so that it may face the limit streamline Fa on the blade surface in the negative pressure surface 33a of the propeller blade 33. As shown in FIG. Therefore, the water flow flowing through the negative pressure surface 33a side of the propeller blade 33 can be effectively corrected.

In the propulsion apparatus of the ship of 1st Embodiment, the wing surface upper limit streamline which generate | occur | produces the guide vane 41 of the negative pressure surface 33a side of the propeller blade 33 on the positive pressure surface 33b side of the propeller blade 33. It arrange | positions along (Fb). Accordingly, the water flow along the limit streamline Fa on the wing surface of the negative pressure surface 33a of the propeller blade 33 is guided by the vane 41 on the wing surface of the positive pressure surface 33b side of the propeller blade 33. By correcting for the flow along the limit streamline Fb, it is possible to effectively suppress the generation of the hub vortex.

In the propulsion apparatus of the ship of 1st Embodiment, the intersection with the rear edge 33d of the rotation direction A of the propeller blade 33 in the extension line along the guide vane 41 formed in the negative pressure surface 33a side. In (rear end 41b), the angle formed by the tangent of the extension line along the guide vane 41 at this intersection and the tangent of the limit streamline Fb on the wing surface on the positive pressure surface 33b side at the intersection are And 0 degrees to 5 degrees. Therefore, by allowing the attachment angle of the guide vanes 41 to allow a margin, the manufacturability can be improved after sufficiently securing the suppression effect of the generation of the hub vortex.

In the propulsion apparatus of the ship of 1st Embodiment, the guide vane 41 is formed in the range of 0-5 degree with respect to the attachment surface orthogonal to the negative pressure surface 33a of the propeller blade 33. As shown in FIG. Therefore, by allowing the attachment angle of the guide vanes 41 to allow a margin, the manufacturability can be improved after sufficiently securing the suppression effect of the generation of the hub vortex.

In the propulsion apparatus of the ship of 1st Embodiment, the length L of the rotation direction A of the propeller blade 33 in the guide vane 41 orthogonally crosses the negative pressure surface 33a of the propeller blade 33. It is set longer than the length (H) of the direction. Therefore, the guide vane 41 can be set to an optimum shape according to the shape of the propeller blade 33.

Moreover, in the ship of 1st Embodiment, since the propulsion apparatus 14 is provided in the ship body 12, generation | occurrence | production of hub vortex can be suppressed.

Second Embodiment

Fig. 8 is a schematic diagram showing the water flow on the positive pressure surface side of the propeller blades in the propulsion device of the ship according to the second embodiment. In addition, the same code | symbol is attached | subjected to the member which has the function similar to embodiment mentioned above, and detailed description is abbreviate | omitted.

In the second embodiment, as shown in FIG. 8, in the propeller blade 33, the propeller blades 33 protrude from the surface at the rotation center (center O) side in the radial direction of the propeller 21 (see FIG. 2). The guide vane 51 is formed along the rotation direction A of the propeller 21.

The guide vane 51 is formed on the positive pressure surface 33b side of the propeller blade 33. This guide vane 51 is located from the outer circumferential surface of the boss 32 to the position of 1/10 radius of the propeller 21 on the rear edge 33d side of the rotation direction A of the propeller blade 33. It is arranged in the area.

That is, when setting the blade length (length of the rotation direction A) of the propeller blade 33 to C, the guide vane 51 is sheared (front end of the rotation direction A of the propeller blade 33) ( The position of 51a is formed in the rear side of the rotation direction A of the propeller blade 33 rather than 1 / 2C (0.5C) from the front edge 33c of the propeller blade 33. In addition, the position of the rear end (back end of the rotation direction A of the propeller blade 33) 51b of the guide vane 51 is smaller than that of the rear edge 33d of the propeller blade 33 at the propeller blade 33. It is formed in the front side of the rotation direction A of the.

In addition, when the radius from the center O to the tip of the propeller blade 33 is R and the radius from the outer circumferential surface of the boss 32 to the center position in the thickness direction of the guide vane 51 is R1, the guide is The vanes 51 are formed in a region where 1 / 10R? R1 (0.1R? R1).

Specifically, the guide vanes 51 are arranged to face the limit streamline Fb on the blade surface of the propeller blade 33 on the positive pressure surface 33b. That is, the guide vane 51 collides with the water flow which flows along the limit streamline Fb on the wing surface, without following the limit streamline Fb on the wing surface in the propeller blade 33 in the positive pressure surface 33b. The flow direction is arrange | positioned by the angle which changes to the front end side of the propeller blade 33 by this. In this case, it is preferable that the guide vane 51 sets the angle which the guide surface 51c of the tip end side of the propeller blade 33 and the limit streamline Fb on a blade surface make to an obtuse angle.

Specifically, the guide vanes 51 formed on the positive pressure surface 33b side of the propeller blade 33 are disposed along the wing surface upper limit streamline Fa generated on the negative pressure surface 33a of the propeller blade 33. It is desirable to be. In this case, the guide vane 51 may be curved or planar. However, when the guide vane 51 is a curved surface, when the guide surface 51C is a curved surface, it is set as a parallel surface with respect to the upper limit streamline Fa of a wing surface, and when the guide surface 51c is a plane, a limit streamline on a wing surface Let it be a surface parallel to the tangent of (Fa). The tangent in this case is at the rear end 51b of the guide vane 51.

Moreover, the guide vane 51 formed in the negative pressure surface 33a side of the propeller blade 33 is always arrange | positioned along the wing surface upper limit streamline Fa which generate | occur | produces on the negative pressure surface 33a of the propeller blade 33. There is no need to do it. For example, at the intersection (rear end 51b) with the rear edge 33d of the rotation direction A of the propeller blade 33 in the extension line along the guide vane 51 formed on the positive pressure surface 33b side. The angle formed by the tangent of the extension line along the guide vane 51 at this intersection and the tangent of the limit streamline Fa on the wing surface of the negative pressure surface 33a side at the intersection is in the range of 0 to 5 degrees. Is preferably set to. That is, the guide vane 51 formed on the positive pressure surface 33b side of the propeller blade 33 has a wing surface upper limit streamline (in which the guide surface 51c is generated on the negative pressure surface 33a of the propeller blade 33). You may make it incline to 5 degree with respect to Fb) to the center side of the propeller blade 33, or incline to 5 degrees to the front end side.

Moreover, the attachment angle with respect to the positive pressure surface 33b of the propeller blade 33 of the guide vane 51, the length L of the rotation direction A of the propeller blade 33, and the negative pressure surface of the propeller blade 33 ( The length (height) H of the direction orthogonal to 33a), the thickness t of the radial direction of the propeller blade 33, and shape may be changed like the above-mentioned 1st Embodiment.

Thus, in the propulsion apparatus of the ship of 2nd Embodiment, it is connected to the end in the axial direction in the propeller shaft 22 and the propeller shaft 22 supported so that the rear part of the ship body 12 can rotate freely. The propeller 21 is provided with the propeller 21, The propeller 21 is a plurality of propeller blades which are fixed to the boss 32 fixed to the edge part of the propeller shaft 22, and the outer peripheral part of the boss 32 at predetermined intervals in the circumferential direction. And 33 are formed along the rotation direction A of the propeller 21 so as to protrude from the static pressure surface 33b of the propeller blade 33 at the rotation center O side in the radial direction of the propeller 21. It has a guide vane 51.

Therefore, when the propeller 21 rotates by forming the guide vane 51 along the rotation direction A of the propeller 21 so as to protrude from the positive pressure surface 33b of the propeller blade 33, the propeller blade 33 The water flow which flows through the static pressure surface 33b of () is guided by the guide vane 51 in a predetermined direction, and flows along the climbing-curve circular line Cb. Then, when the water flow flowing on the negative pressure surface 33a of the propeller blade 33 and the water flow flowing on the positive pressure surface 33b merge at the rear edge 33d of the propeller blade 33, the direction of each water flow is It is approximated and generation | occurrence | production of a vortex is suppressed and it can suppress generation | occurrence | production of a hub vortex.

[Third Embodiment]

9 is a schematic view showing a negative pressure surface of a propeller blade in a propulsion apparatus for a ship according to a third embodiment, and FIG. 10 is an X-X cross-sectional view of FIG. 9. In addition, the same code | symbol is attached | subjected to the member which has the function similar to embodiment mentioned above, and detailed description is abbreviate | omitted.

In the third present embodiment, as shown in Figs. 9 and 10, in the propeller blade 33, the surface of the propeller 21 (see Fig. 2) is located on the rotation center (center (O)) side in the radial direction. The guide vanes 41 and 51 are formed along the rotation direction A of the propeller so as to protrude from.

The guide vane 41 is formed on the negative pressure surface 33a side of the propeller blade 33. This guide vane 41 is located from the outer circumferential surface of the boss 32 to the position of 1/10 radius of the propeller 21 on the rear edge 33d side of the rotation direction A of the propeller blade 33. It is arranged in the area. Moreover, the guide vane 51 is formed in the positive pressure surface 33b side of the propeller blade 33. This guide vane 51 is located from the outer circumferential surface of the boss 32 to the position of 1/10 radius of the propeller 21 on the rear edge 33d side of the rotation direction A of the propeller blade 33. It is arranged in the area.

The guide vanes 41 formed on the negative pressure surface 33a side of the propeller blade 33 and the guide vanes 51 formed on the positive pressure surface 33b side of the propeller blade 33 are in the thickness direction of the propeller blade 33. It is preferable to form in the position opposite to. Specifically, the guide vane 41 and the guide vane 51 have the same position in the radial direction of the propeller blade 33 at the position of the rear edge 33d, and the length of the rotation direction A is the same length. It is preferable to set to. However, the guide vanes 41 and the guide vanes 51 may be formed at different positions which do not face each other, or may have different shapes.

Thus, in the propulsion apparatus of the ship of 3rd Embodiment, of the propeller 21 so that it may protrude from the negative pressure surface 33a of the propeller blade 33 in the rotation center O side in the radial direction of the propeller 21. The propeller 21 so that the guide vane 41 formed along the rotation direction A may protrude from the positive pressure surface 33b of the propeller blade 33 at the rotation center O side in the radial direction of the propeller 21. The guide vane 51 formed along the rotational direction A of () is formed.

Accordingly, the respective guide vanes 41 and 51 correct the flow of water flowing on the negative pressure surface 33a of the propeller blade 33 and the flow of water flowing on the positive pressure surface 33b, thereby approximating and swirling the direction of each flow. Is suppressed, and it is possible to suppress the occurrence of hub swirl.

Fourth Embodiment

It is a schematic diagram which shows the water flow of the negative pressure surface side of the propeller blade in the propulsion apparatus of the ship of 4th Embodiment. In addition, the same code | symbol is attached | subjected to the member which has the function similar to embodiment mentioned above, and detailed description is abbreviate | omitted.

In the fourth embodiment, as shown in FIG. 11, the propeller blades 33 protrude from the surface on the rotation center (center O) side in the radial direction of the propeller 21 (see FIG. 2). Guide vanes 41 and 42 are formed along the rotation direction A of the propeller 21.

The guide vanes 41 and 42 are formed on the negative pressure surface 33a side of the propeller blade 33. These guide vanes 41 and 42 are located at the 1/10 radius of the propeller 21 from the outer circumferential surface of the boss 32 on the rear edge 33d side of the rotation direction A of the propeller blade 33. It is arranged in the area up to. The guide vanes 41 and 42 are formed at predetermined intervals in the radial direction of the propeller blade 33.

In addition, in this embodiment, you may form two guide vanes 41 and 42 in the negative pressure surface 33a side of the propeller blade 33, or may form three or more. Moreover, you may form two guide vanes 41 and 42 in a different position, or make it a different shape. Moreover, you may provide one or several guide vanes in the positive pressure surface 33b side of the propeller blade 33.

Thus, in the propulsion apparatus of the ship of 4th Embodiment, the guide vanes 41 and 42 are moved to the negative pressure surface 33a side or the positive pressure surface 33b side of the propeller blade 33 in the radial direction of the propeller 21. A plurality is formed at predetermined intervals. Therefore, it is possible to effectively suppress the occurrence of hub vortex.

11: ship
12: hull
13: stern
14: propulsion device
21: propeller
22: propeller shaft
23: key
31: Bossing
32: boss
33: propeller wing
33a: negative pressure surface
33b: Positive pressure surface
33c: front edge
33d: rear edge
41, 42, 51: guide vanes
41a, 51a: shear
41b, 51b: rear end
Ca, Cb: Climbing circle arc
Fa, Fb: marginal streamline on wing surface

Claims (10)

A propeller shaft supported at the rear of the hull to rotate freely;
It is provided with the propeller connected to the edge part in the axial direction in the said propeller shaft,
The propeller,
A boss fixed to an end of the propeller shaft,
A plurality of propeller blades fixed to the outer circumferential portion of the boss at predetermined intervals in a circumferential direction;
It has a guide vane formed along the rotation direction of the said propeller so that it may protrude from the surface of the said propeller blade in the rotation center side in the radial direction of the said propeller,
The guide vane is disposed so as to face a limit streamline on the blade surface of the propeller blade, and the guide vane is disposed on both the positive pressure side and the negative pressure side of the propeller blade,
The guide vane formed on either of the negative pressure surface side and the positive pressure surface side of the propeller blade is disposed along the limit streamline on the wing surface occurring on any other of the negative pressure surface side and the positive pressure surface side of the propeller blade. Propulsion unit. The method of claim 1,
The said guide vane is arrange | positioned in the area | region from the outer edge side of the rotational direction of the said propeller blade to the position of the 1/10 radius of the said propeller from the outer peripheral surface of the said boss. delete delete delete The method of claim 1,
The tangent of the extension line along the guide vane at the intersection at the intersection with the rear edge of the rotational direction of the propeller blade in the extension line along the guide vane formed at either one of the negative pressure side and the positive pressure side. And an angle formed by a tangential line between the negative pressure surface side and the positive pressure surface side of the intersection at the intersection of the limiting streamline on the wing surface is set in a range of 0 to 5 degrees. The method of claim 1,
The guide vane, the propulsion device of the ship, characterized in that formed in the range of 0 to 5 degrees with respect to the mounting surface orthogonal to the surface of the propeller blades. The method of claim 1,
The guide vane is a propulsion device of a ship, characterized in that the length of the rotation direction of the propeller blade is set longer than the length of the direction orthogonal to the surface of the propeller blade. The method of claim 1,
The guide vane is a propulsion device of the ship, characterized in that formed on the negative pressure side or the positive pressure side of the propeller blade at a predetermined interval in the radial direction of the propeller. The ship provided with the propulsion apparatus of the ship as described in any one of Claims 1, 2, and 6-9.

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