JPS6138545A - Testing device for raindrop collision - Google Patents

Abstract

PURPOSE:To improve the setting precision of rainfall conditions by composing a fainfall generator of an injection nozzle and a nozzle position adjusting mechanism, and varying the diameter and position of the nozzle. CONSTITUTION:A rainfall mechanism 103 is installed above the top surface of a protection container 1, i.e. rainfall chamber 3 and consists of the raindrop generator composed of the injection nozzle 16 and a nozzle position adjusting mechanism 17, and a pump 12, partition valve 13, relief valve 14, water supply pipe 15, and feed supply tank 18 as feed supply facilities. The injection nozzle 16 is settable at an optional vertical position by the nozzle position adjusting mechanism 17 and replaceable with a nozzle having a different diameter. Then, the amount of raindrops injected from the nozzle 16 is controlled through the relief valve 14. Therefore, the nozzle diameter, injection position, and feed water pressure are varied to easily set rainfall conditions and improve the setting precision greatly.

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. of aircraft flying in rain due to raindrop impact.

An example of this type of device is one that uses an assembly method drop test in which raindrops are substituted with m-balls. 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.

As another example, as shown in Fig. 5, a part of the leading edge of the inner peripheral part of the rotor blade 52 is cut out in a large reinforced concrete 1/11v51, a small sample 55 is attached thereto, and the rotor blade 52 is mounted on a mount. This equipment is equipped with a raindrop collision test device that is supported by a raindrop generator 53 and rotated at a predetermined speed, and is designed to cause raindrops scattered by centrifugal force from a raindrop generator 54 to collide with a sample 55! Because it uses actual raindrops, it can also simulate transient phenomena, making it extremely effective as a testing device. However, there are problems such as the large-scale installation, the small size of the specimen installation, which limits the shape of the specimen, and the difficulty in setting rainfall conditions (9 particle size distributions per rainfall). These problems pose technical barriers to improving this type of test method.

[Problem 1 to be Solved by the Invention As mentioned above, the conventional device has the following problems (1) to (2).

■ Protected type 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 problems, and provides a raindrop impact test device that can particularly easily set rainfall conditions and increase the setting accuracy, thereby improving test accuracy. The purpose is to

[Means for Solving the Problems] The gist of the present invention is to use a spray nozzle that is easy to handle and whose spray amount etc. can be easily varied, and to utilize raindrops sprayed from this nozzle.

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 on an object flying or running during rain, the raindrop generator is equipped with an injection nozzle and the vertical position of the nozzle. It is configured with a nozzle position adjustment mechanism for setting.

[Operations and Effects of the Invention] In the present invention, since the rain generator is composed of an injection nozzle and a nozzle position adjustment mechanism, rain conditions can be easily varied by changing the nozzle diameter and nozzle position. . Roughly speaking, rain conditions can be easily variably set by changing the water supply pressure to the injection nozzle. By controlling these three elements, any condition can be created, and it is extremely easy to set the rain conditions. Moreover, since each of the above-mentioned elements has high reproducibility, the accuracy of setting the rainfall conditions can be made sufficiently high. Therefore, it is possible to significantly improve test accuracy.

[Embodiments of the invention] Hereinafter, details of the present invention will be explained 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 11 protection structures, 101. It is composed of a drive v1 groove 102 and a rain mechanism 103.

The protection mechanism 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 rainwater seedling 3 on the upper side, forming a so-called two-story structure. . The lower surface of the motor chamber 2 is the earth, and the upper surface of the rain chamber 3 is open to the atmosphere.

A swirling flow prevention window 4 and a scattering protection wall 5 are provided in a portion of the container 1 corresponding to a rotation surface of a rotation m9 to be described later, respectively. 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 (■) of the rotor blade 9 and the tip clearance, but depending on these selections,
The protective container 1 can be kept to a minimum scale. 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 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 thereof. This drain pipe 19 is connected to the protective container 1
It is led outside and connected to a drainage facility outside the container 1.

The axle drive mechanism 102 is a drive motor 97 fixed to the ground.
Drive shaft 81 rotor blade 9. Bod 10 and motor control section 11
The specimen is mounted on the front part of the 1° body. 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.

At the tip of the drive shaft 8 introduced into the rain v3,
A rotary blade 9 consisting of a pair of blades is attached. rotor blade 9
As shown in FIG. 3, a bod 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 bod 1o 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.

The rain mechanism 103 is installed on the upper surface of the protective container 1, that is, above the rain chamber 3, and consists of the following components. That is, injection nozzle 1
6 and a raindrop generator consisting of a nozzle position adjustment mechanism 17;
A pump 12 which is a water supply equipment outside the protective container 1. Gate valve 1
3. Pressure regulating valve 14. It is composed of a water supply pipe 15 and a water supply tank 18.

Here, the injection nozzle 16 can be set to 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 apparatus configured in this way, the sample 23 is attached to the body 10 of the rotor 9, the rotor 9 is rotated by the motor 7, and the nozzle 1 is connected to the nozzle 1 by the pre-rainfall groove 103.
By generating raindrops from 6 and causing them to collide with the sample body 23, a raindrop impact test on the sample body 23 can be performed.

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, various conditions can be easily set by selecting in advance the diameter of the nozzle 16, the vertical position of the nozzle 16, the water supply pressure, etc., and conducting a preliminary test.

The raindrops sprayed in the rain chamber 3 are finally blocked by the partition plate 6 and guided 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 bod 10 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 of the rotary blades 9 and the pound 10 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.

■ The protective container 1 has a two-story structure consisting of a motor room 2 and a rain room 3, and the motor room 2 and rain room 3 are completely separated, making it possible to prevent raindrops from entering the motor 7. . Therefore, it is possible to bring the motor 7 and the rotary blade 9 sufficiently close to each other, and the motor 7 and the rotation rA9 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 in the rain v3 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 pound 10
19, a large side transport effect can be obtained. Therefore, the rotor blade 9 can be rotated at high speed, thereby increasing the test speed range. This effect makes it possible to test aircraft radomes and the like in conditions close to the intended purpose, which is a great effect for this type of testing device.

(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 the pressure regulating valve 14 are used, the nozzle diameter,
It is possible to apply three-element control of the injection position and water supply pressure, which allows (1) high accuracy in setting rainfall conditions (2) arbitrary settings and easy handling (3I equipment is compact and can be installed in a protected room) Effects such as ease of adaptation to scale (4) and low cost 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 the figures (a>(b), a plurality of partition plates 25 may be provided radially from the center of the rotor blade 9.Furthermore, the number of rotor blades is not limited to one pair (two pieces), and the test speed For the purpose of improving the performance, two or more sheets may be used.Also, it is not limited to aircraft radomes, but also raindrop impact tests on various flying objects, automobiles, etc., and the effects of raindrops (surface damage, peeling of paint, erosion of outer panels, etc.) ), it goes without saying that it can be applied to crash tests used for the purpose of understanding.

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 the rain generator is composed of the injection nozzle and the number of nozzle position adjustment structures,
Rain conditions can be easily set, and the setting accuracy can be made sufficiently high, so that test accuracy can be significantly improved.

[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 the rotary blade and the body 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. 1...Protective container, 2...Motor room, 3...Rainfall, 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, 20... Vibration fault, 21...
・Aerodynamic damping material (fin) 22...IR damping material, 23...Sample, 25...Partition plate, 10
1... Protection (number of structures, 102... Rib rock structure, 103...
14 Rain IM.

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 raindrop generator is equipped with an injection nozzle and a nozzle position adjustment mechanism that sets the vertical position of the nozzle. A raindrop collision test device characterized by comprising: