JP2011021981A - Ejection tester - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an ejection tester keeping excessive pressure from acting on an acceleration tube even where a sabot and a flying object are separated from each other by a sabot stopper, and preventing the sabot from scattering. <P>SOLUTION: This ejection tester 1 includes the acceleration tube 4 for accelerating the sabot 3 that holds the flying object 2 by using acceleration energy, a vacuum chamber 6 housing a front end of the acceleration tube 4 while housing a target 5 with which the flying object 2 accelerated in the acceleration tube 4 is made collide, and the sabot stopper 7 provided in the vacuum chamber 6 and used for receiving the accelerated sabot 3 to separate the flying object 2 from the sabot 3 while making only the flying object 2 collide with the target 5. In the ejection tester 1, the sabot stopper 7 is disposed apart from the acceleration tube 4, and a slidable positioning/scattering-preventing cylinder 29 is provided between the acceleration tube 4 and the sabot stopper 7 for coupling the two while positioning the acceleration tube 4 to the sabot stopper 7. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an injection test apparatus for testing a high-speed collision phenomenon by causing a flying object to collide with a target at a high speed in order to study a high-speed collision phenomenon such as a bird strike to a jet engine.

  Since a jet engine or the like may be damaged by a bird strike or the like, it is necessary to test its impact resistance performance to confirm safety. Therefore, a flying object such as a metal piece, a bird or gelatin imitating it is accelerated and collided with a target such as a jet engine at a high speed to test its impact resistance performance.

  The injection test apparatus used for this test is an apparatus that accelerates the flying object using the explosive energy of compressed gas or explosives and collides with the target at high speed.

  The injection test apparatus generally includes an acceleration energy supply system that supplies acceleration energy, an acceleration tube (straight tube portion) for accelerating the flying object, and a collision part between the flying object and the target. Since the shape and dimensions of the flying object differ depending on the target test, there is a method in which the flying object is put in a container called Sabo, accelerated, separated immediately before the collision with the target, and only the flying object collides with the target. It is general purpose.

  As a method of separating the sabo and the flying object, (1) a method of naturally separating the flying object held in the divided sabo using air resistance, and (2) a vent hole is provided at the tip of the acceleration tube , And a method of attaching a sabo stopper that is made to collide with the sabo with a reduced diameter, and (3) the exit of the accelerating tube is a free space, and a sabo stopper that separates the flying object by colliding with the sabo in front of it There is a method to provide in.

JP 2004-77323 A

  However, in the method (1) in which the sabot and the flying object are separated using air resistance, a very long distance is required for the separation part, and there is a problem that the total length of the injection test apparatus becomes long. In addition, there is a possibility that speed reduction and posture change may occur due to the presence of air.

  In addition, in the method (2) in which a sabot stopper is directly attached to the tip of the acceleration tube, an excessive force due to the axial direction of the acceleration tube and the pressure caused by the expansion of the sabot acts, and damage to the acceleration tube or its attached parts is caused. It is a problem that may occur or the sabot may not be removed.

  Further, in the method (3) in which the acceleration tube and the sabot stopper are installed independently, there are problems that it is difficult to adjust the positional relationship between the two and that the sabot repelled by the sabot stopper is scattered and collides with the surroundings.

  SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide an injection test apparatus capable of preventing sabo from being scattered without causing excessive pressure to act on the accelerating tube even when the sabo and the flying object are separated by a sabo stopper.

  The present invention was devised in order to achieve the above object, and the invention of claim 1 accommodates a sabot holding a flying object at the rear end and uses the explosive energy of a compressed gas or explosive. An acceleration tube for accelerating, a vacuum chamber containing the tip of the acceleration tube and a target for colliding the flying object accelerated in the acceleration tube, and a vacuum chamber provided in the vacuum chamber for acceleration In addition, in the injection test apparatus comprising a sabot stopper for receiving the sabot and separating the projectile from the sabot and causing only the projectile to collide with the target, the sabot stopper is separated from the acceleration tube. The slidable positioning is arranged between the accelerating tube and the sabot stopper and connects the accelerating tube to the sabot stopper. An injection test apparatus characterized by shatterproof tube is provided.

  According to a second aspect of the present invention, the sabot stopper has a through hole that is smaller than the sabot and allows only the flying object to pass therethrough, and the positioning and scattering prevention cylinder is fitted to the center of the positioning and scattering prevention cylinder. The injection test apparatus according to claim 1, further comprising a fitting groove for positioning at the center.

  According to a third aspect of the present invention, a gas vent pipe having a gas vent hole formed on the outer periphery is fitted to the tip of the acceleration pipe, and the positioning scattering prevention cylinder is slidably provided on the outer circumference of the gas vent pipe. An injection test apparatus according to claim 1 or 2.

  A fourth aspect of the invention is the injection test apparatus according to the third aspect, wherein the centers of the accelerating tube, the degassing tube, and the positioning scattering prevention cylinder are positioned so that the centers thereof are the same.

  According to the present invention, it is possible to provide an injection test apparatus in which excessive pressure does not act on the accelerating tube even when the sabo and the flying object are separated by a sabo stopper, and the sabo can be prevented from scattering.

(A) is a schematic side view of the injection test apparatus which concerns on one embodiment of this invention, (b) is a figure which shows the sabot holding the flying body. It is sectional drawing which shows the principal part of the injection test apparatus of FIG.

  Preferred embodiments of the present invention will be described below with reference to the accompanying drawings.

  Fig.1 (a) is a schematic side view of the injection | emission test apparatus based on this Embodiment, FIG.1 (b) is a figure which shows the sabot holding the flying body. FIG. 2 is a cross-sectional view showing the main part (part A of FIG. 1A). In FIG. 2, the target is schematically illustrated in a simplified manner.

  As shown in FIGS. 1 and 2, the injection test apparatus 1 accommodates a sabot 3 holding a flying object 2 at the rear end (left side in the figure), and uses the explosive energy (acceleration energy) of compressed gas or explosives. And an accelerating tube 4 for accelerating, a vacuum chamber 6 that accommodates a tip 5 (right side in the figure) of the accelerating tube 4 and a target 5 that collides the flying object 2 accelerated in the accelerating tube 4; Provided in the vacuum chamber 6 is provided with a sabo stopper 7 for receiving the accelerated sabo 3 to separate the flying object 2 from the sabo 3 and causing only the flying object 2 to collide with the target 5. In this embodiment, a case where compressed gas is used as acceleration energy will be described.

  The target 5 to be tested is, for example, a material that requires impact resistant design such as a fan blade of a jet engine. As the flying object 2, various things such as a bird, gelatin imitating it, or a metal piece are used. As a test of a high-speed collision phenomenon using these, for example, there is a test for confirming impact resistance when a bird is sucked into a jet engine.

  The sabot 3 is made of a polymer material such as polyethylene. Since the polymeric material has a large elongation at break and is not easily broken even when it collides with the sabo stopper 7, it is possible to prevent the sabo 3 from being broken and the fragments from being scattered. The shape of the sabot 3 is formed in a cylindrical shape with one end opened, and the flying object 2 is held in the opening 8. Therefore, the opening 8 of the sabo 3 is formed into various shapes according to the shape of the flying object 2 that collides with the target 5 (in FIG. 1 (b), the flying object 2 is formed into a rectangular shape because it has a quadrangular prism shape. Have been).

  The acceleration tube 4 is supported by a plurality (three in FIG. 1) of support pillars S along the longitudinal direction thereof, and the center thereof is made to be substantially in a straight line. An acceleration energy supply system 9 is connected to the rear end of the acceleration tube 4. The acceleration energy supply system 9 includes a pressure accumulation container 10 for accumulating gas, a gas cylinder 11 for supplying gas to the pressure accumulation container 10, and a valve 12 connected to the rear end of the acceleration pipe 4.

For example, helium (He) or nitrogen (N ₂ ) is used as the gas supplied to the pressure accumulating vessel 10. As an inert gas, helium having a small molecular weight is preferable because it is most easily accelerated.

  The valve 12 is composed of, for example, an electromagnetic valve. After accumulating gas in the pressure accumulating container 10, the sabot 3 accommodated at the rear end of the accelerating tube 4 is accelerated by opening the electromagnetic valve at once.

  The acceleration energy supply system 9 and the acceleration tube 4 are connected via a flange portion 13. When installing the sabot 3 holding the flying object 2 at the rear end of the acceleration tube 4, the acceleration energy supply system 9 and the acceleration tube 4 are separated from each other with the flange portion 13 as a boundary, and the flight at the rear end of the acceleration tube 4 is performed. The sabot 3 is installed in the body installation unit 14. Therefore, the acceleration energy supply system 9 is movable in the left-right direction in the figure.

  A target 5 that collides the flying object 2 accelerated in the acceleration tube 4 is accommodated in a vacuum chamber 6 connected to the tip of the acceleration tube 4. In the vacuum chamber 6, devices for capturing a high-speed collision phenomenon such as a laser and a high-speed camera are installed. Further, an observation window W is provided on the side wall of the vacuum chamber 6.

  Further, a seal flange 16 having a seal portion 15 (for example, packing) is formed at the tip of the acceleration tube 4. The tip of the acceleration tube 4 is inserted into the insertion hole 18 formed in the side wall 17 of the vacuum chamber 6 and the seal flange 16 is screwed to the side wall 17 with a screw 19 so that the tip of the acceleration tube 4 is placed in the vacuum chamber 6. Sealed and housed. Thereby, the inside of the acceleration tube 4 is also evacuated, and the sabo 3 holding the flying object 2 in the acceleration tube 4 is sufficiently accelerated.

  A through hole 20 that is smaller than the sabot 3 and passes only the projectile 2 is formed in the sabot stopper 7 that receives the accelerated sabot 3 and separates the projectile 2 from the sabot 3. Therefore, the accelerated sabot 3 is stopped by colliding with the outer peripheral portion of the through hole 20, and only the flying object 2 collides with the target 5. Needless to say, the sabot stopper 7 is formed of a material and a design that have soundness against the impact force of the sabot 3. For example, the reinforcing portion 21 is formed on the surface opposite to the surface where the sabo 3 of the sabo stopper 7 collides (that is, the surface on the target 5 side) so as to withstand the impact when the sabo 3 collides. The sabot stopper 7 is supported by a support base 23 screwed into the vacuum chamber 6 with a screw 22 and fixed by screwing from the side and below (screw fixing portion 24).

  Further, a gas vent pipe 26 having a gas vent hole 25 formed on the outer periphery is fitted to the tip of the acceleration pipe 4. A center positioning flange 27 for positioning and fixing the center of the accelerating tube 4 and the center of the gas venting tube 26 is formed at the rear end of the gas venting tube 26 fitted to the tip of the acceleration tube 4. That is, when the gas vent pipe 26 is fitted to the acceleration pipe 4, the center positioning flange 27 is fixed to the side wall 17 of the vacuum chamber 6 by screwing with the screw 28 while being positioned. Accordingly, the center of the acceleration tube 4 and the gas vent tube 26 are positioned and fitted so that the centers thereof are the same. The gas vent pipe 26 is for discharging gas from the rear of the sabo 3 from the gas vent hole 25 and preventing the residual pressure from acting on the acceleration pipe 4. Therefore, the gas vent hole 25 is formed in such a size that the gas behind the sabo 3 can be released in a short time.

  Now, in the injection test apparatus 1 according to the present embodiment, the sabot stopper 7 is arranged separately from the acceleration tube 4. This is because when the flying object 2 is separated from the sabot 3, vibration and stress when the sabot 3 collides with the sabot stopper 7 are transmitted to the acceleration tube 4, and excessive force is applied to the acceleration tube 4 and its attached parts. This is to prevent damage from occurring due to the action.

  However, if the accelerating tube 4 and the sabot stopper 7 are arranged apart from each other, there are problems that it is difficult to adjust the positional relationship between them and that the sabot 3 repelled by the sabot stopper 7 is scattered and collides with the surroundings. End up.

  In order to solve this problem, the injection test apparatus 1 is provided with a slidable positioning and scattering prevention cylinder 29 that connects between the acceleration tube 4 and the sabot stopper 7 and positions the acceleration tube 4 on the sabot stopper 7. Structure. The positioning scattering prevention cylinder 29 includes a large-diameter portion 30 serving as a scattering cover that prevents the sabot 3 from scattering and a small-diameter sliding portion that slidably fits on the outer periphery of the gas vent pipe 26 fitted to the tip of the acceleration tube 4. The positioning / scattering prevention cylinder 29 is provided so that the center thereof is the same as the center of the acceleration tube 4. Further, the sabot stopper 7 of the injection test apparatus 1 has the same diameter as the positioning and scattering prevention cylinder 29 for fitting the positioning and scattering prevention cylinder 29 and positioning the center of the positioning and scattering prevention cylinder 29 at the center of the through hole 20. A fitting groove 32 is provided.

  That is, by providing the positioning scattering prevention cylinder 29 that connects between the acceleration tube 4 and the sabot stopper 7 on the outer periphery of the gas vent tube 26 fitted to the tip of the acceleration tube 4, the sabot repelled by the sabot stopper 7. 3 is prevented from scattering. Since the sabo 3 repelled by the sabo stopper 7 collides with the gas vent pipe 26 and the positioning scattering prevention cylinder 29, the gas vent pipe 26 and the positioning scattering prevention cylinder 29 may be formed of, for example, SUS304. Thereby, the impact by the collision of the sabot 3 can be absorbed, and these damages can be prevented. Further, by providing a slidable positioning scattering prevention cylinder 29 on the outer periphery of the gas vent pipe 26, vibrations and stresses of the sabo stopper 7 due to the collision of the sabo 3 are not transmitted to the acceleration pipe 4. Further, the center of the positioning / scattering prevention cylinder 29 is positioned at the center of the through hole 20 by fitting the positioning / scattering prevention cylinder 29 in the fitting groove 32.

  Next, an injection test using the injection test apparatus 1 will be described.

  First, before the test, the positioning scattering prevention cylinder 29 fitted to the gas vent pipe 26 is slid and fitted into the fitting groove 32 of the sabot stopper 7, thereby preventing positioning scattering from the through hole 20 of the sabot stopper 7. The centers of the cylinder 29 and the acceleration tube 4 are made the same. Further, the acceleration tube 4 and the acceleration energy supply system 9 are separated from each other with the flange portion 13 as a boundary, and the sabo 3 holding the flying object 2 is accommodated and installed in the flying object installation unit 14 at the rear end of the acceleration tube 4.

  Thereafter, the inside of the vacuum chamber 6 is evacuated to a desired degree of vacuum, and gas is supplied from the gas cylinder 11 to the pressure accumulating vessel 10. By evacuation, the inside of the vacuum chamber 6 and the inside of the acceleration tube 4 to the valve 12 are evacuated. When the accumulator 10 is filled with sufficient gas to accelerate the sabo 3 at a desired speed, the valve 12 is opened at once, and the sabo accommodated in the rear end of the acceleration tube 4 with the filled compressed gas. Accelerate 3 That is, the sabo 3 is accelerated at a desired speed by appropriately adjusting the pressure in the pressure accumulating vessel 10 and the degree of vacuum in the accelerating tube 4 to the valve 12 according to the test environment. Can do.

  The sabo 3 accelerated in the accelerating tube 4 passes through the gas vent pipe 26 fitted to the tip of the accelerating tube 4 and then collides with the sabo stopper 7 so that the flying object 2 is separated from the sabo 3. At this time, the sabot 3 that has collided with the sabot stopper 7 is deformed, but if the diameter of the gas vent pipe 26 is made sufficiently large, it does not interfere with the deformation of the sabot 3 and therefore no pressure is generated due to expansion. In addition, the positioning scattering prevention cylinder 29 serves as a scattering cover against the bounce of the sabot 3 and the sabot 3 is contained. The gas from the rear of the sabo 3 is released from the vent hole 25 of the vent pipe 26, and no residual pressure acts on the acceleration pipe 4. Further, the impact due to the bounce of the sabot 3 is absorbed by the sliding of the positioning and scattering prevention cylinder 29, and the impact is not transmitted to the acceleration tube 4 and excessive stress is not applied.

  The flying object 2 separated from the sabo 3 collides with the target 5 previously stored in the vacuum chamber 6. The impact resistance performance of the target 5 is investigated based on the information obtained from the target 5 after the collision and various devices such as a laser and a high-speed camera.

  When the repeated test is performed, the positioning / scattering prevention cylinder 29 is slid toward the accelerating tube 4 to remove the sabot 3 remaining on the positioning / scattering prevention cylinder 29, and the positioning / scattering prevention cylinder 29 is again inserted into the fitting groove of the sabot stopper 7. The test is performed after fitting and positioning to 32.

  As described above, according to the injection test apparatus 1 according to the present embodiment, the sabot stopper 7 is disposed apart from the acceleration tube 4, and the acceleration tube 4 and the sabot stopper 7 are connected to each other while the sabot stopper 7 is connected. Since the stopper 7 is provided with a slidable positioning scattering prevention cylinder 29 for positioning the acceleration tube 4, vibrations and stresses of the sabot stopper 7 due to the collision of the sabot 3 can be prevented from being transmitted to the acceleration tube 4, and the sabot stopper The sabo 3 that has been deformed and expanded upon collision with 7 can be confined in the positioning / scattering prevention cylinder 29 so as not to scatter around.

  Further, according to the injection test apparatus 1, the fitting groove 32 for positioning the center of the positioning / scattering prevention cylinder 29 at the center of the through hole 20 by fitting the positioning / scattering prevention cylinder 29 to the sabot stopper 7 is formed. In addition, since the centers of the acceleration tube 4, the gas vent tube 26, and the positioning and scattering prevention cylinder 29 are made the same, the acceleration pipe 4 can be obtained simply by fitting the positioning and scattering prevention cylinder 29 into the fitting groove 32. Further, the center of the gas vent pipe 26 and the positioning scattering prevention cylinder 29 can be easily positioned at the center of the through hole 20.

  Further, in the injection test apparatus 1, the acceleration tube 4 and the gas vent tube 26 are independent structures, so that it is not necessary to make a hole in the long acceleration tube 4 or to perform screw processing.

  In short, according to the injection test apparatus 1, even if the sabot 3 and the flying object 2 are separated by the sabot stopper 7, excessive pressure does not act on the acceleration tube 4, and scattering of the sabot 3 can be prevented.

DESCRIPTION OF SYMBOLS 1 Injection test apparatus 2 Flying object 3 Sabo 4 Acceleration pipe 5 Target 6 Vacuum chamber 7 Sabo stopper 29 Positioning scattering prevention cylinder

Claims (4)

A sabo holding a flying object is accommodated at the rear end, and an acceleration tube for accelerating it using the explosive energy of compressed gas or explosive, and the tip of the acceleration tube are accommodated and accelerated in the acceleration tube. A vacuum chamber in which a target for colliding the flying object is housed, and a vacuum chamber provided in the vacuum chamber for receiving the accelerated sabot to separate the flying object from the sabot and using only the flying object as the target. In an injection test apparatus equipped with a sabo stopper for collision,
The sabot stopper is disposed apart from the acceleration tube, and a slidable positioning and scattering prevention cylinder is provided between the acceleration tube and the sabot stopper to connect the acceleration tube and the sabot stopper. An injection test apparatus characterized by being provided.   The sabot stopper is a fitting for positioning the center of the positioning and scattering prevention cylinder at the center of the through hole by fitting the through hole that is smaller than the sabot and allows only the flying object to pass therethrough and the positioning and scattering prevention cylinder. The injection test apparatus according to claim 1, further comprising a groove.   The degassing pipe | tube with which the gas vent hole was formed in the outer periphery is fitted by the front-end | tip of the said acceleration pipe | tube, The said positioning scattering prevention cylinder is slidably provided in the outer periphery of the said gas vent pipe. Injection test equipment.   The injection test apparatus according to claim 3, wherein the centers of the acceleration tube, the gas vent tube, and the positioning scattering prevention cylinder are positioned so that the centers thereof are the same.

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