JPH0743402U - Shape and fine vibration that suppress the resistance of an object in a fluid - Google Patents

Abstract

(57) [Summary] [Purpose] To reduce drag due to drag and friction of an object (ship) in a fluid, smooth direction change, and prevent deceleration. Improve the sailing of the yacht to the windward. [Structure] A small hole is made in the rudder and center board to reduce drag due to turbulence. Make the rudder and center board wings
Use lift. A flexible film is put on the inside of the rigid structure of the rudder. When the rudder is turned off, the film spills water into a wing shape (sail shape), generating lift. Acceleration of water flow by jet pump enhances lift. To reduce fluid friction by installing a micro-vibration generator such as sound waves (including ultrasonic waves) on the surface of airplanes and ships.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention is a device for suppressing deceleration of an object in a fluid (for example, a ship, an airplane, a ball, etc.), smoothing navigation, flight and direction change, contributing to speeding up and improving fuel efficiency. (Hereinafter, the rudder of the ship will be mainly described.)

[0002]

[Prior art]

 With respect to claims 1 to 4, the conventional rudder generates a drag force due to turbulent flow, resulting in unnecessary deceleration.

A conventional rudder is a single-plate rudder or a streamlined rudder, whose cross section is a target, and has a rigid structure.

[0004] Although some skegs form an airfoil in a pseudo manner, none of them transform the rudder blade into an airfoil.

Regarding claim 5, none of the acceleration flows enhance the lift.

As for claim 6, there is no method for reducing resistance by using fine vibration.

[0006 ']

[Problems to be solved by the device]

 Prevents drag due to turbulence and suppresses deceleration.

By utilizing the lift force, the direction is smoothly changed even at a low speed. (At the center board of a yacht, lift on the upwind side is used to prevent a leeway downwind, improving the upwind lift.)

Fine vibrations are used to reduce the resistance of the fluid.

[0009]

[Means for Solving the Problems]

 In claims 1 and 2, a small hole is formed in the rudder. (Small holes may be slots.)

According to the third and fourth aspects, the rudder and the center board are made to have an airfoil shape of an airplane to generate lift.

According to the fifth aspect, the jet pump is used to speed up the flow velocity at the rudder and the center board to enhance the lift.

According to claim 6, the surface of the ship (flying object) or water (air) near the surface is finely vibrated to reduce the resistance of the fluid.

[0013]

[Action]

 In claims 1 and 2, the small holes suppress the bursting phenomenon, reduce the turbulent flow due to the wake of the Karman vortex street, and reduce the drag force, so the speed does not decrease.

According to the third and fourth aspects, since the lift force of the airfoil is used, the direction can be smoothly changed. (The center board of a yacht uses lift on the windward side to prevent re-winding to the leeward, which makes it easier to climb upwind.)

According to the fourth aspect, when the rudder is turned off, the flexible structure portion of the rudder swells into a sail shape due to the pressure of water, and lift can be utilized to reduce turbulence and smoothly change the direction.

According to claim 5, the acceleration flow by the jet pump enhances the lift force.

Regarding claim 6, the microvibration reduces the resistance of the fluid.

[0018]

【Example】

 In claims 1 to 2, the rudder is provided with a small hole (a drum shape, an abacus ball shape) or a slot.

A small hole opening / closing device is provided, and the hole is closed when straight traveling or deceleration is required (in the center board, the hole is opened / closed depending on the degree of yawing or re-way required).

According to the third aspect, the surface of the rudder surface opposite to the traveling direction (rear side) is inflated by hydraulic pressure or the like to make the rudder wing-shaped and generate lift. (Even if the front surface of the streamlined rudder is flattened, the same effect can be obtained.)

The rudder may be deformed physically or mechanically, and a large number of plates (plate-shaped or rod-shaped) are vertically projected (raised diagonally) on the surface of the rudder to form an airfoil as a whole. Make a structure.

The strength of the lift is adjusted by changing the shape of the airfoil.

According to a fourth aspect, the rudder has a double structure of a frame having a rigid structure and a flexible rudder plate portion (for example, rubber) inside the frame.

The rubber film may be a cloth or the like, and gives tension like a sailboat sailing.

The rudder is transformed into an airfoil of an airplane to generate lift.

A guide frame such as a board sailing boom is provided in the horizontal direction of the frame to guide the frame to a shape that easily generates lift and prevent it from expanding more than necessary.

In the case of straight traveling, unnecessary fluttering is suppressed by narrowing the width of the guide frame (having a structure that allows it) and pressing the film.

By changing the thickness (strength) of each part of the rubber or inserting a core rod (core wire), the wing is guided to an ideal wing shape and unnecessary flapping is suppressed.

Alternatively, a structure such as a sail of a yacht capable of adjusting tension may be used.

As another method, the rudder may be provided with a partition to change the left and right bulges by using electric or hydraulic power.

In claim 5, the water accelerated by the jet pump is applied to the rudder or the center board to enhance the lift.

According to the sixth aspect, a diaphragm (speaker) is installed in front of the surface of the underwater portion of the ship to generate sound waves (including ultrasonic waves). Vibrate the hydrofoil surface of the hydrofoil.

The intensity and frequency of vibration are adjusted according to the speed and the state of water (air).

A golf ball or the like has an optimum natural frequency.

[0035]

[Effect of device]

 With regard to claim 1, the bursting phenomenon is suppressed by the small holes, the turbulent flow due to the wake of the Karman vortex street is reduced, and the drag force is reduced, so that the speed does not decrease.

According to the second and third aspects, the turbulent flow is further suppressed by the shape of the small holes (the hourglass shape, the abacus ball shape).

With respect to claims 4, 5, and 6, since the drag force is reduced and the lift force is used, the direction can be smoothly changed. (In the case of the center board of a yacht, lift force on the windward side is used to prevent a leeway downwind, which improves the uphill windward.)

Due to the lift of the airfoil and the effect of the small holes, it is possible to steer smoothly at a small rudder angle (or without rotating the rudder), reduce turbulence and reduce drag, so speed is reduced. Don't you?

In combination with the center board, it is possible to achieve the same effect as steering a 4WS automobile.

The flow velocity of the jet pump enhances the lift, and the steering can be performed even at a low speed.

In the case of a dinghy yacht or small boat, it can be used as a propulsion force (in the absence of wind) as an alternative to a turret (like flippers) in tiller operation.

Fine vibrations generated by a navigating (submersible, flying) object reduce the resistance of the fluid.

These contribute to speeding up and improving fuel efficiency.

[0044]

[Brief description of drawings]

FIG. 1 is a perspective view showing a rudder with a small hole, a center board, and a jet pump according to the present invention.

[Explanation of symbols]

 1 Rudder with small holes 2 Jet pump 3 Center board with small holes

FIG. 2 is a plan view of a wing-shaped rudder according to the present invention.

[Explanation of symbols]

 1 airfoil rudder

Claims (7)

[Scope of utility model registration request] 1. A wing, a rudder, or a center board (keel) having small holes to prevent turbulent flow and suppress deceleration. 2. A small hole in a wing, a rudder, or a center board, in which the small hole has a drum shape (both openings are wide and central part is narrow). 3. A small hole in a wing, rudder, or center board (the shape of the vertical cross section) is a ball-shaped abacus (both openings are narrow and the center is wide). 4. A rudder or a center board, which is formed into a wing shape to utilize a lift force to smoothly change the direction or to improve the windward uphill. 5. A rudder or a center board, in which water is caught like a sail when the rudder is turned off, and its lift is used to change the direction. 6. A wing, a rudder, or a center board, which uses a jet pump to enhance lift. 7. A microvibration and its generator for reducing the fluid frictional resistance of an object in a fluid.