JP6111491B2 - Ship propulsion device - Google Patents

Description

  The present invention relates to a propulsion device for a ship, and in particular, changes a draining wave generated at the bow to a propulsive force, resulting in a decrease in resistance associated with the traveling of the ship and a reduction in fuel consumption, thereby improving economy The present invention relates to a marine vessel propulsion device.

  As a method of reducing the resistance of the water draining wave at the bow that is generally used at present, first, as is called the so-called Barbasse bow, a protrusion is projected on the bow, and the water is drained by the interference between the wave generated there and the wave generated at the bow. To reduce the resistance by reducing the wave, secondly, to reduce the generation of waves by sharpening the tip of the bow, and thirdly, using hydrofoil attached at a position away from the hull, and using the shaking of the hull There are things to promote.

  Here, what should be considered is the magnitude of the effect, the wide range of use, and the economics. The first Barbasse bow is currently widely used, but the actual effective driving condition is in a certain speed range, and does not exhibit a sufficient effect at a speed outside the condition. The sharpened tip of the second hull has the effect of reducing the resistance as in the first method, but does not have the effect of generating thrust in itself. The third method uses propulsion of the entire ship due to the general wave rather than the bow wave, and a relatively large fin is necessary to obtain thrust effectively with gentle waves. In addition, the airfoil needs to be subject to the use of waves in both the upper and lower directions, but this causes a stall phenomenon and impairs its effectiveness. As a result, structural conditions such as making it movable or making it with a flexible material are added, resulting in complicated shapes and low durability. .

Japanese Patent No. 3571083 Japanese Patent No. 4831384

  The technical background is that fossil fuels are almost exhausted, and the practical application of technologies that have the effect of reducing the amount of fuel used for operation is an immediate task. However, these known technologies are widely applicable. There is virtually no method that can convert bow wave energy into thrust. There is a need for a method that can be easily applied to existing ships, is inexpensive, and can produce a propulsive force in a wide range of use.

  The problem to be solved by the present invention is comprehensively studied from the viewpoint of energy saving technology of the ship, and is unaffected by the size and speed of the ship, integrating the effects as a propulsion device, its versatility, and the implementation cost. To provide a marine vessel propulsion device having a significant improvement effect.

  Means for solving the above-mentioned problems of the present invention is characterized in that a wing-shaped member projecting right and left just below the draft surface near the bow of a ship and having a cross section of an aircraft wing cross section is fixedly provided. The propulsion device is provided.

  The effect of the present invention is to form a wave in which the water pushed by the hull at the bow of traveling swells on the water surface against gravity due to an increase in pressure. This flow has an upward angle of about 10 ° to 20 °. When this upward flow hits a wing member projecting from side to side, repulsive force is generated in a direction perpendicular to the flow. The positive component of the lift is the driving force of the ship. This is the same principle that gliders fly using updrafts. Furthermore, since the flow that has passed through the wing member is bent in the horizontal direction, the formation of waves rising rearward is suppressed, and as a result, the resistance to wave increase is reduced. These synergistic effects effectively convert the bow wave into thrust. According to the aquarium experiment, the reduction of the bow wave is very obvious visually, and it is confirmed that the propulsion resistance decreases at a wide ship speed, so that the generation of propulsive force by this wing member is effective. Proven.

FIG. 1 is a side view showing an embodiment of the present invention. FIG. 2 is a front view showing an embodiment of the present invention. FIG. 3 is a top view showing an embodiment of the present invention.

  The embodiment for simplifying and realizing in the range which does not impair the function of the vessel propulsion device of the present invention is shown.

FIG. 1 is a side view showing an embodiment of a marine vessel propulsion device according to the present invention, FIG. 2 is a front view showing one embodiment of the present invention, and FIG. 3 is an upper surface showing another embodiment of the present invention. FIG.
1, 2, and 3, a bow part 2 of a ship hull 1 is fixedly provided with a wing member 3 that protrudes right and left just below the draft surface and has a cross section of an aircraft wing cross section. The broken line 4 shows the streamline of the wave which generate | occur | produces at the bow of the conventional ship, and the continuous line 5 shows the streamline of this invention. In FIG. 1, the wing member 3 is preferably directly below the waterline 6, and the angle is substantially horizontal. The shape of the blade cross section may be vertically symmetrical, but a shape having a bulge on the upper side is desirable. As shown in FIG. 3 , the shape seen from the upper surface of the wing member 3 is preferably a shape whose tip is slender and inclined slightly later. The above-mentioned camber is almost flat at the tip of the blade, and in some cases, it is desirable that the leading edge is slightly lowered downward. In addition, when viewed from the front in FIG. 2, it is desirable that the wing member 3 is in a state where the tip is slightly lowered downward. Since the wing member 3 may be subjected to extremely large wave forces, it must have sufficient strength. Moreover, it is not deviated from the gist of the present invention to have a structure that can be folded downward or backward when the berth is at rest.

[Operation]
The operation of the marine vessel propulsion device of the present invention shown in the above embodiment will be described. As described above in the section of the effect of the invention, the water pushed by the hull at the bow of traveling forms a wave that swells on the water surface against gravity due to the increase in pressure. This flow has an upward angle of about 10 ° to 20 °. When this upward flow hits a wing member projecting from side to side, repulsive force is generated in a direction perpendicular to the flow. The positive component of the lift is the driving force of the ship. This is the same principle that gliders fly using updrafts. Furthermore, since the flow that has passed through the wing member is bent in the horizontal direction, the formation of waves rising rearward is suppressed, and as a result, the resistance to wave increase is reduced. These synergistic effects effectively convert the bow wave into thrust. In the above description, the wing member 3 often generates thrust by changing a flow having an upward angle of about 10 ° to 20 ° into a horizontal or slightly downward flow. Therefore, it is desirable to have a cross-sectional shape having a bulge (camber) upward like a main wing of an aircraft. However, if the tip portion forms such a cross section, a so-called blade tip vortex may be generated to generate induction resistance.

  In order to avoid this, it is necessary to reduce the camber and angle of attack at the blade tip. Therefore, it is desirable that the shape of the blade cross section be large at the base portion of the blade member 3 as shown in FIG. 1 and close to a symmetrical blade at the tip portion. In addition, as shown in FIG. 2, the wing member 3 is formed as if the tip is slightly lowered downward. The bow wave has an upward component, and at the same time, it is divided into left and right at the bow, and has a wide lateral component. This is to make sure that this flow can be fully understood. Furthermore, as shown in FIG. 3, the tip is inclined rearward in order to prevent floating substances and the like from being caught when navigating at sea. As shown in FIG. 3, the shape of the bow wave is narrowed because it is accelerated backward by attaching the wing member 3 of the present invention, and the wave energy is converted into propulsive force and absorbed. Therefore, it is shown that the height disappears in a short range because the height is greatly reduced.

  In addition, what is propelled by utilizing the general vertical motion of the ship due to waves is a known technology as a so-called wave eater propulsion device, etc., but is relatively large in order to effectively obtain thrust with gentle waves. In addition to the need for fins in the area, the airfoil needs to be subject to up and down in order to use the wave motion in both directions. However, the so-called angle of attack changes by a maximum of ± 90 ° in the up-and-down motion caused by the waves when the boat speed is slow, so that the stalling phenomenon occurs and the effectiveness is greatly impaired. As countermeasures, structural conditions such as making the trailing edge of the fins movable up and down or making it from a flexible material are added, resulting in a complicated shape and low durability. It has not been widely applied because of restrictions on usage conditions. The marine vessel propulsion device of the present invention is limited to the use of the bow wave, and as a result, the angle of the flow hitting the wing member 3 is limited to an upward angle of about 10 ° to 20 °, and the wing cross section of the wing member 3 is optimal for this angle. A camber having a bulge on the upper side can be attached, and it can be fixedly attached. The structure is simple and it is possible to prevent a stall phenomenon from occurring in the flow around the wing member 3. The stall phenomenon causes bubbles and must be avoided to promote corrosion of the material. As described above, the marine vessel propulsion device of the present invention is a technology in a field that is significantly different from a so-called wave eater propulsion device.

  As is apparent from the above description, the marine vessel propulsion apparatus of the present invention can change the bow wave into propulsive force by simply attaching a wing member in the vicinity of the bow of the hull. It can be applied to a wide range of applications without being affected by size, and can be easily installed on existing ships, and the structure is simple and the cost is not large, so it can be put to practical use at an early stage. The energy saving effect can be easily realized, and the industrial power enhancement effect on the ship industry is extremely remarkable.

1 hull 2 bow 3 wing member 4 broken line 5 solid line 6 draft line

Claims (1)

Projecting right and left from the side of the hull just below the draft surface on both sides of the hull near the bow of the ship, the top surface is similar to an aircraft wing, the cross section is an aircraft wing cross section, and the mounting angle to the hull is the side A marine vessel propulsion device, characterized in that a wing member is fixedly provided with a front edge part slightly lowered when viewed from the front and a wing tip lowered downward when viewed from the front.

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