JPS6037417B2 - wave making device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a wave-making device that generates waves in a towing tank, a Yuei pool, or other water tank used for testing the characteristics of water or underwater navigation engines.

Accurate waves are required when testing the surface and underwater characteristics of scale models of surface and underwater navigation engines such as ships and submarines, and in experimental tanks such as towing tanks, flap type,
There are three types of wave-making devices: float type and pneumatic chamber type. In the flap type, as shown in Fig. 1, a wave-making plate 2 is erected on the bottom 1 of the aquarium, and the wave-making plate is attached to the bottom 1 of the aquarium with a hinge or the like so that vibration can be spread, and the upper end of the wave-making plate 2 is moved forward and backward. It oscillates and causes waves. The wave amplitude (i.e., the ratio of wave height to wavelength) produced by this device is approximately 1/10.
However, the disadvantage is that the length L of the hinterland (see Figure 1) must be quite large. In addition, it is necessary to install a wave dissipating device 3 such as a wire mesh in the hinterland to absorb the violent vertical movement of water in the hinterland and the shaking energy of waves, and to prevent the water in the aquarium from overflowing to the outside. There are drawbacks like that. Further, as shown in FIG. 2, the float type is one in which a wedge-shaped float 4 is moved up and down to generate waves. This float type device has the advantage of not requiring a hinterland, but it requires a large force to sink the float 4 to a certain depth, and in order to avoid this, water is poured into the float 4. Adding weight by adding something like this has the disadvantage that the horsepower required to pull this heavy object upward increases. The maximum wave steepness of this type of device is about 1/15, and it has a medium wave-making ability. In addition, the pneumatic chamber type shown in FIG.
It generates waves outwards, but the steepness is about 1/2
Its wave-making ability is inferior. As a rough guide to the steepness of waves in the natural world, it is about 1/2 in the middle of the Pacific Ocean and about 1/1 in the northern Pacific Ocean where the peninsula and the Kuroshio Current collide, or where large rivers and tidal currents collide. , the maximum slope is about 1/1, and it can be considered that waves with a slope of 1/10 or more do not occur in the natural world, except for winding waves caused by typhoons and the like.

The purpose of the present invention is to eliminate the above-mentioned drawbacks of the conventional technology, to generate waves in experimental tanks for still water such as towing tanks and swimming pools, by eliminating the need for a hinterland and wave-dissipating equipment, and by eliminating the need for a hinterland or wave-dissipating device. The first invention is characterized in that a wave-making plate is horizontally arranged below the water surface, and the wave-making device is moved up and down to cause wave-making action by the wave-making plate,
The second invention is characterized in that a back plate is provided on the wave-making plate to eliminate the need for a large hinterland and a wave-dissipating device. This is because the width of the waves has been narrowed to increase wave-making efficiency.

Embodiments of the first and second inventions will be described in detail below with reference to the drawings.

FIG. 4 shows a first embodiment of the first invention, in which a wave-making device according to the invention is implemented in a towed water tank 11 containing still water 12.

A plurality of wave-making plates 13a, 13b, 13c, and 13d are coupled by two vertical coupling plates 14, 14 provided opposite to the wave-making plates at right angles, and a support provided at the upper end of the coupling plates. The wave-making plate is supported horizontally by a punch 15,
is a back plate that connects the rear end of the wave-making plate. If the support village 15 is moved up and down by an appropriate vertical movement means such as a motor, waves 13a, 13b, . . . are generated in the left direction in FIG. In this way,
The advantage is that waves can be given directionality, the back plate 16 can absorb the oscillating energy of the water, prevent the water in the tank from overflowing to the outside of the tank, and eliminate the need for the length L of the hinterland. has.

In addition, the second embodiment of the first invention shown in FIG. 5 does not directly move the wave-making plates up and down as in the previous embodiment, but is a swinging motion in which the wave-making plates 13a to 13d are supported substantially horizontally. The supporting punch 17 is swung by a motor 20 or the like about the fulcrum 19 of the support fitting 18, and the back plate 16 is formed into a suitable or preferably arcuate curved surface with a radius R that is curved in the vertical direction. .

In this way, water resistance is reduced and there is less oscillation on the water surface, and since the water at the end of the water tank of the wave-making device does not move, less horsepower is required, and there is no need for a large backland or wave-dissipating device. This is the result.

The wave-making plates 13a, 13b, etc. in this invention may be one or more, but in the second invention, when a plurality of wave-making plates are provided, the wave-making plates 13a, 13b, etc. shown in FIGS. As shown in the figure, the width in the water flow direction is narrowed and has the effect of increasing wave-making efficiency.

That is, waves are propagated by circular motion of water, and the amplitude of this circular motion decreases by 4.0 mm as the depth of water increases. For example, in deep sea waves, the amplitude of circular motion decreases to about 4% at a depth of 1/2 wavelength and to 0.2% at a depth of 1 wavelength. Therefore, it is thought to be effective to apply wave-making energy to a larger amount at the top and a smaller amount at the bottom. fact,
As mentioned above, in the flap-type wave-making device shown in Figure 1, instead of giving circular motion to the water, it moves it laterally, but due to its structure, the water surface moves more at the top, and smaller at the bottom. , the method of providing wave-making energy is adapted to the vertical distribution of wave energy, and for this reason,
The above-mentioned slope is large and allows effective waves to be obtained. As described above, the first invention has a structure that includes means for horizontally supporting the wave-making plate and means for moving the wave-making plate up and down, so that the wave-making plate can be used in still water experiments such as towed water tanks. By providing a back plate at the rear end, waves can be made directional and a large wave with an accurate slope can be generated for experiments without the need for a large back ground or wave dissipating device. is simple, and the vertical movement operation underwater can be easily performed with little resistance.The second invention is the first invention in which the width of the wave-making plate in the water flow direction is narrowed as it goes downward. With this configuration, it is possible to perform an effective wave-making action and increase the wave-making efficiency, and it has a remarkable effect as a wave-making device.

[Brief explanation of the drawing]

Figures 1 to 3 show conventional embodiments. Figure 1 is a reduced cross-sectional view of a flub type wave generator, Figure 2 is a cross-sectional side view of a float type wave generator, and Figure 3 is a cross-sectional side view of a float type wave generator. It is a cross-sectional side view of a pneumatic chamber type breaking device. Figures 4 and 5 show embodiments of this invention.
The figure is a cross-sectional side view of the first embodiment in still water such as a towed water tank, and FIG. 5 is a cross-sectional side view showing the second embodiment in still water such as a towed water tank. 13a, 13b, 13c, 13
d... Horizontal wave-making board, 15, 17... Horizontal support means for the wave-making board, 16... Back plate, 20... Vertical movement means for the wave-making board. Figure 1 Figure 2 Figure 3 Figure 4 Figure 5

Claims (1)

[Scope of Claims] 1. A wave-making device characterized by having means for supporting a wave-making plate having a back plate at its rear end substantially horizontally below the water surface, and means for vertically moving the wave-making plate. Device. 2. The wave-making device according to claim 1, which uses a curved back plate that is curved in an arc shape in the vertical direction as the back plate. 3. Means for supporting a plurality of wave-making plates each having a back plate at the rear end, the width of which is narrowed in the water flow direction as it goes downward, substantially horizontally below the water surface, and means for moving the wave-making plates up and down. A wave-making device characterized by having: 4. The wave-making device according to claim 2, which uses a curved back plate that is curved in an arc shape in the vertical direction as the back plate.