JPS6138541A - Testing device for raindrop collision - Google Patents

Abstract

PURPOSE:To reduce the size of a protection container by providing a swirl flow preventing mechanism composed of a swirl flow preventing window or partition plate and reducing the influence of a swirl flow due to the rotation of a rotating blade. CONSTITUTION:A protection device 101 is made of an enclosure type protection container 1, which is divided into a lower motor chamber 2 and an upper rainfall chamber 3 by the partition plate 6 to facilitate a discharge treatment extremely with the partition plate 6. Further, the swirl flow preventing window 4 to which a mesh body is adhered and a scatter preventing wall 5 are provided to a part corresponding to the rotating surface of the rotating blade 9, and the influence of a swirl flow in the rainfall chamber 3 due to the rotation of the rotating blade 9 is prevented, so the container 1 is reduced in size and the constitution of the whole device is also reduced in scale.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a raindrop collision test device that simulates raindrop collision conditions of an object flying or running in rain.

[Prior Art] Conventionally, a raindrop impact test device has been used to elucidate the mechanism of destruction of radomes, paint, etc. due to raindrop impact on aircraft flying in rain.

An example of this type of device is a method drop test in which raindrops are substituted for the method. However, this device lacks the ability to simulate the transient phenomenon that occurs when raindrops collide with an object, and as a testing method, it can only provide a limited estimate, and a technical solution has not yet been reached.

In addition, as another example, as shown in Figure 5, a large reinforced concrete wall [! A part of the front edge of the inner peripheral part of the rotary blade 52 is cut out, a small sample 55 is attached thereto, the rotor 1152 is supported by a pedestal 53, rotated at a predetermined speed, and a raindrop generator is installed. There is a raindrop collision test device that is devised to cause raindrops scattered by centrifugal force from a specimen 54 to collide with a specimen 55. Since this device uses actual raindrops, it can also simulate transient phenomena, making it extremely effective as a test device. However, these problems include the need for large-scale equipment, the small size of the specimen installation, which limits the shape of the specimen, and the difficulty in setting rainfall conditions (one rainfall amount, one particle size, one distribution). The problem is a technical barrier to improving this type of test method.

[Problems to be Solved by the Invention] As described above, the conventional apparatus has the following problems (1) to (4).

■　Protection requirements will be large-scale.

■ The shape and size of the sample is limited.

■ It is difficult to set rainfall conditions.

■ The equipment is expensive.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and in particular, to provide a raindrop impact test device that can reduce the influence of swirling flow caused by the rotation of rotor blades and can reduce the size of a protective container. With the goal.

[Means for Solving the Problems] The gist of the present invention is to reduce the influence of the swirling flow caused by the rotation of the rotor blade, which is the reason why the protective container cannot be made smaller, and to reduce the size of the protective container.

That is, the present invention includes a protective container, a rotary blade disposed in the protective container and having a specimen fixed to its tip, a drive motor that rotationally drives the rotary blade, and a drive motor that generates raindrops and applies the raindrops to the specimen. In a raindrop collision test device that simulates raindrop collision conditions of an object flying or running in rain, the device is equipped with a raindrop generator that collides with a raindrop generator, and a raindrop collision test device that simulates a raindrop collision condition of an object flying or running in rain. A swirl flow prevention mechanism is provided by a swirl flow prevention window formed by cutting out or a plurality of partition plates arranged radially from the rotation axis of the rotor blade.

[Operations and Effects of the Invention] Since the present invention is provided with a swirl flow prevention mechanism consisting of a swirl flow prevention window or a partition plate, the influence of swirl flow in the protective container caused by the rotation of the rotor blade is significantly reduced. be able to. Therefore, the protective container can be made smaller, and the overall structure can be made smaller, making it easier to handle, which has great practical advantages.

[Embodiments of the Invention] Details of the present invention will be described below with reference to illustrated embodiments.

FIG. 1 is a schematic configuration diagram showing a raindrop collision test apparatus according to an embodiment of the present invention. This device is roughly divided into protective groove 1
01. It is composed of a driving rib modification 102 and a rain ditch 103.

The protective dawn structure 101 consists of a cylindrical protective container 1, and this container 1 is divided by a partition plate 6 into a motor room 2 on the lower side and a rain room 3 on the upper side, forming a so-called two-story structure. There is. The lower surface of the motor room 2 is the earth, and the upper surface of the rain v3 is exposed to the atmosphere.

A swirling flow prevention window 4 and a scattering protection wall 5 are respectively provided in a portion of the container 1 corresponding to a rotating surface of a rotor blade 9, which will be described later. Here, the swirling flow prevention window 4 prevents the influence of the swirling flow inside the rain chamber 3 due to the rotation of the rotor blade 9, and as shown in FIG. It is formed by covering a mesh body. Further, the size H of the swirl flow prevention window 4 is determined by the relationship between the rotational speed V of the rotor blade 9 and the tip clearance, and depending on these selections,
The protective container 1 can be kept to a minimum size. The scattering protection wall 5 is for preventing accidents caused by the scattering of rotating bodies, and is made of a cylindrical body arranged so as to surround the swirling flow prevention window 4. The inner surface of the scattering protection wall 5 is constructed by attaching tassels or the like to a steel plate for the purpose of absorbing the kinetic energy of the flying objects. Further, a drainage slope is provided at the bottom of the scattering protection wall 5 and the partition plate 6', and a drainage pipe 19 is connected to the lowest part of the drainage slope. This one drain pipe is led outside the protective container 1 and connected to a drainage facility outside the container 1.

The drive mechanism 102 includes a drive motor 7 fixed to the ground;
Drive shaft 81 rotor blade 9. Bod 10 and motor control section 11
The test specimen is attached to the front part of the pod 10. Here, the motor 7 is fixed to the ground via a vibration isolation layer 20. The drive shaft 8 is directly connected to the rotating shaft of the motor 7, and is introduced into the rain chamber 3 through the partition plate 6.

Then, at the tip of the drive shaft 8 introduced during the rainfall 3,
A rotary blade 9 consisting of a pair of blades is attached. Rotation H9
As shown in FIG. 3, a bond 10 is attached to the tip thereof. A structural damping material 22 is attached to the surface of the blade surface of the rotary blade 9, and an aerodynamic damping material (fin) 21 is attached to the rear of the pond 10. Vibration of the rotor blade 9 is suppressed by these damping materials 21 and 22. In addition, sample 23
is attached to the front part of the body 10. Here, the front part of the pound 10 can be shared with the specimen 23.

Further, a partial test piece 24 such as a flat plate may be attached to the pound 10 as a sample.

Rainfall (j14i103 is installed on the upper surface of the protective container 1, that is, above the rain chamber 3, and consists of the following: a raindrop generator consisting of an injection nozzle 16 and a nozzle position @ adjustment mechanism 17, and a raindrop generator outside the protective container 1. Pump 12 which is water supply equipment. Gate valve 13. Pressure regulating valve 14. Water supply pipe 15 and water supply tank 18
It is composed of.

Here, the injection nozzle 16 can be set at any position in the vertical direction by a nozzle position adjustment mechanism 17. Further, the nozzle 16 can be replaced with one having a different diameter as appropriate. The amount of raindrops injected from the nozzle 16 is controlled by the pressure regulating valve 14.

In this device configured in this way, the sample 23 can be rotated! Attach the rotor blade 9 to the motor 7.
A raindrop impact test on the sample body 23 can be performed by rotating the sample body 23 and causing raindrops to be generated from the nozzle 16 using the rain compensation groove 103 and colliding with the sample body 23 .

In this case, the rain conditions in the rain chamber 3 are the diameter of the raindrops,
It is determined by the distribution, amount, etc., and these conditions are determined by changes in the injection position, nozzle diameter, water supply pressure, etc.

There is a correlation between these three parties (injection nozzle 1
Due to the characteristics of No. 6, larger raindrops may concentrate on the outside, and the particle size may change depending on the pressure. Therefore, by selecting various diameters of the nozzle 16, vertical positions of the nozzle 16, water supply pressure, etc. in advance and conducting preliminary tests,
It becomes possible to easily set various conditions.

Raindrops sprayed in the rain chamber 3 are finally blocked by the wall of the rain chamber 3 and the partition plate 6, and are led to an external drainage facility via a drain pipe 19 provided in the partition plate 6. Rotor blade9.
Rainwater that adheres to the surface of the pond 1o and scatters on the rotating surface due to centrifugal force is similarly guided to the partition plate 6 through the scattering protection wall 5. Further, the effect of the swirling flow inside the rain chamber 3 induced by the rotation II9 and the rotation of the bod 1o is avoided by the action of the swirling flow prevention window 4.

Therefore, according to the apparatus of this embodiment, the following effects (1) to (4) can be obtained.

(2) Since the protective container 1 has a two-story structure containing the motor v2 and the rain v3, and the motor room 2 and the rain room 3 are completely separated, it is possible to prevent raindrops from entering the motor 7. Therefore, the motor 7 and the rotary blade 9 can be brought sufficiently close to each other, and the motor 7 and the rotary blade 9 can be directly connected. As a result, the drive motor 7 can be made more compact, and the overall structure can be made more compact.

Further, due to the function of the partition plate 6, there is an advantage that waste water treatment can be performed extremely easily.

(2) Since the swirling flow prevention window 4 is provided on the wall of the protective container 1, the influence of the swirling flow inside the rain chamber 3 can be avoided, and thereby the protective container 1 can be made smaller.

The downsizing of the protective container 1 means that the overall configuration of the device becomes smaller.
It has great practical advantages because it is easy to handle and inexpensive. In addition, since the scattering protection wall 5 is provided, accidents caused by the scattering of the rotating body can be prevented, and safety can be improved.

■ Damping material 21°22 on rotor blade 9 and body 10
Since it is provided, a large vibration damping effect can be obtained. Therefore, the rotor blade 9 can be rotated at high speed, thereby increasing the test speed aVc. This effect enables testing in conditions close to the general view of an aeronautical radome, which is a great effect for this type of test equipment.

(2) Since the bod 10 is provided at the tip of the rotary blade 9, it is possible to test a relatively large sample. Furthermore, since the front part of the pound 10 can be shared with the specimen, there are fewer restrictions on the shape and size of the specimen.

■ As a rain mechanism, nozzle 16. Since the nozzle position adjustment mechanism 17 and pressure regulating valve 14 are used, the nozzle diameter,
It is possible to apply three-element control of injection pressure and water supply pressure, which allows (1) high accuracy in setting rainfall conditions, (2) arbitrary settings and easy handling, and (3) compact equipment. It is easy to respond to the scale of defense if (it can be realized at low cost, etc.), and other effects can be obtained.

Note that the present invention is not limited to the embodiments described above. For example, instead of providing the swirl flow prevention window 4, a fourth
As shown in Figures (a) and (b), a plurality of partition plates 25 may be provided radially from the center of the rotary blade 9. Furthermore, the number of rotary blades is not limited to one pair (two blades), and may be two or more blades for the purpose of improving the test speed. In addition, it can be applied not only to aircraft radomes but also to raindrop collision tests of various flying objects, automobiles, etc., and collision tests used for the purpose of understanding the effects of raindrops (surface damage, peeling of paint, erosion of outer panels, etc.) Of course, this is true.

In addition, various modifications can be made without departing from the gist of the present invention.

As detailed above, according to the present invention, since a swirling flow prevention mechanism is provided to prevent swirling flow within the protective container, the protective container can be sufficiently miniaturized, and the overall configuration can be downsized. , it is extremely effective as a raindrop impact test device.

[Brief explanation of drawings]

Fig. 1 is a schematic diagram showing the configuration of a raindrop collision test device according to an embodiment of the present invention, Fig. 2 is a schematic diagram showing the configuration of the anti-swivel window used in the above device, and Fig. 3 is a schematic diagram showing the configuration of the anti-swivel window used in the above device. FIG. 4 is a perspective view showing the shape of a rotary blade and a bond part, FIG. 4 is a sectional view for explaining a modified example, and FIG. 5 is a schematic configuration diagram showing a conventional raindrop impact test apparatus. DESCRIPTION OF SYMBOLS 1...Protective container, 2...-Motor empty, 3...Rain chamber, 4...Swirling flow prevention window, 5...Scatter protection wall, 6...
・Partition plate, 7... Drive motor, 8... Drive shaft, 9
...Rotary blade, 10...Bod, 11...Motor power supply, 12...Pump, 13...Gate valve, 14...
・Pressure regulating valve, 15... Water supply pipe, 16... Injection nozzle,
17... Nozzle position adjustment mechanism, 18... Water supply tank, 19... Drain pipe, 2o... Vibration isolation layer, 21...
・Aerodynamic damping material (fin) 22...Structural damping material, 23...Sample, 25...Partition plate, 101
...Boui! ! Mechanism, 102... Drive mechanism, 103.
...Rainfall mechanism. Applicant Sub-Agent Patent Attorney Takehiko Suzue Figure 4 (a) (b) Figure 5

Claims (1)

[Claims] A protective container, a rotary blade placed in the protective container and having the specimen fixed to its tip, a drive motor that rotationally drives the rotary blade, and a raindrop generator that generates raindrops and causes the raindrops to collide with the specimen. In a raindrop collision test device that simulates raindrop collision conditions of an object flying or running in rain, the protective container is provided with a portion of the protective container corresponding to the rotor blade to prevent swirling flow due to rotation of the rotor blade. A raindrop collision test device characterized by being provided with a swirling flow prevention mechanism.