JPS6138542A - Testing device for raindrop collision - Google Patents

Abstract

PURPOSE:To reduce the size of a motor by employing the two-story structure of a motor chamber and a rainfall chamber for a protection container, and preventing a raindrop from entering the motor and coupling the motor directly with a rotating blade. CONSTITUTION:The protection container 1 and a partition plate 6 are divided to form the two-story structure of the motor chamber 2 and rainfall chamber 3, preventing a rainfall from entering the motor 7. Therefore, the rotating shaft of the motor 7 is coupled directly with the driving shaft 8 of the rotating blade 9, so the size of the motor 7 is reduced.

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 a steel ball drop test in which raindrops are substituted for the assembly 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.

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 wall 51, and a small sample 55 is attached thereto. There is a raindrop collision test device in which the sample is supported by a frame 53 and rotated at a predetermined speed, and the raindrops scattered by centrifugal force from a raindrop generator 54 collide with a sample 55. Since this device uses actual raindrops, it can also simulate transient phenomena, making it extremely effective as a test device. However, there are problems such as the large scale of the equipment, the small size of the specimen installation, which limits the shape of the specimen, and the difficulty of setting rainfall conditions (rainfall O1 particle size 9 distribution). This problem is a technical barrier to improving the test method for this balance.

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

■ The protection room 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 it is an object of the present invention to provide a raindrop collision test device in which the drive system can be made more compact and the overall structure can be made more compact.

[Means for Solving the Problems] The gist of the present invention is to provide a configuration in which the rotary blades and the drive motor can be directly connected in order to make the drive system more compact, and to prevent raindrops from entering the motor. The purpose is to separate it from the room.

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 protective container is provided in a motor chamber housing the motor and an upper part thereof. It has a two-story structure including a rain chamber housing the rotary blades and a raindrop generator.

[Operations and Effects of the Invention] In the present invention, the protective container has a two-story structure consisting of a motor room and a rain room, and each room is completely separated, so that inconveniences such as raindrops entering the motor can be avoided. I can do it. Also,
Since the motor and the rotary blade can be directly connected, the capacity of the motor can be small, the motor can be made more compact, and the overall configuration can be made more compact.

[Embodiments of the Invention] Details of the present invention will be explained 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 protection mechanism 1.
01. It is composed of a drive mechanism 102 and a rain mechanism 103.

The protective groove 101 consists of a cylindrical protective container 1, and this container 1 is divided by a partition plate 6 into a lower motor chamber 2 and an upper rain chamber 3, resulting in a 112-story structure. There is. 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 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 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 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 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 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.

At the tip of the drive shaft 8 introduced into the rain chamber 3,
A rotary blade 9 consisting of a pair of blades is attached. rotor blade 9
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 wing surface of the rotation 'R9, and an aerodynamic damping material (fin) 21 is attached to the rear of the bod 10. And, by these damping materials 21 and 22, the rotor blade 9
vibration is suppressed. In addition, sample 2
3 is attached to the front part of the body 10. Here, the front part of the bond 10 can be shared with the sample 23. Further, a partial test piece 24 such as a flat plate may be attached to the bond 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, 1. The nozzle 16 can be replaced with one having a different diameter as appropriate. The suspension of raindrops sprayed 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 bond 10 of rotation m9, the rotor blade 9 is rotated by the motor 7, and the nozzle 1 is rotated by the rain mechanism 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, 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 bond 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 pot 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.

■ The protective container 1 has a two-story structure consisting of the motor room 2 and the rain room 3, and the motor room 2 and the rain room 3 are completely connected to each other, so it is possible to prevent raindrops from entering the motor 7. can. 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 action of the partition plate 6, there are advantages such as being able to bend and easily perform wastewater treatment.

(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 bond 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 range. This effect enables testing under conditions close to actual aircraft, such as the Akebono radome, and is a significant effect for this type of test equipment.

(2) Since the bond 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 bond 10 can be shared with the sample, there are fewer restrictions on the shape and size of the sample.

■ 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 the injection position and water supply pressure, which (1) increases the accuracy of setting rainfall conditions (2HQ constant is optional and is easy to handle) (3) the device 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 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 used not only for aircraft radomes, but also for raindrop impact tests on various flying objects, automobiles, etc., and surface impact tests used to determine shadows caused by raindrops9 (surface damage, peeling of paint, erosion of outer panels, etc.). Of course, it can be applied.

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

As detailed above, according to the present invention, by making the protective container have a two-story structure consisting of the motor room and the rain room, it is possible to make the motor more compact and the overall structure smaller, and it is possible to carry out the raindrop impact test. It is extremely effective as a device.

[Brief explanation of the drawing]

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 room, 3... Rain room, 4... Swirling flow prevention window, 5... Scattering 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 vJ blocking layer, 21...
... Aerodynamic damping material (fin) 22 ... Structural damping material, 23 ... Sample body, 25 ... Partition plate, 10
1... Protection (hole groove, 102... drive mechanism, 103...
・・Rainfall 1 several times.

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 the raindrop collision conditions of an object flying or running in rain, the protective container includes a motor chamber that accommodates the motor, and a motor chamber provided above the motor chamber that accommodates the rotary blade and the rotary blade. A raindrop collision test device characterized by having a two-story structure including a rain chamber that houses a raindrop generator.