An air cannon test device and test method for accurately hitting the inner position of a narrow space

Abstract

The invention discloses an air cannon test device and test method for accurately striking the inner position of a narrow space. The device comprises an air cannon barrel and a bullet support positioned in the air cannon barrel, wherein the air cannon barrel comprises an elongated insertion tube, the front end of the insertion tube is provided with a bullet support emission outlet, the insertion tube is of an elongated shape, on the premise of not influencing the flying speed of a projectile, a muzzle is inserted into a narrow space, and the accurate striking of the whole blade disc blade in anarrow space is realized. The bullet support adopts a nylon material in order to reduce the quality of the bullet support, so that the damage and influence of the bullet support on the blade are reduced. The air cannon test device can improve the test precision of the tested blade in a narrow space.

Description

technical field [0001] The invention relates to the technical field of air cannons. Background technique [0002] When the aero-engine is working, it will inevitably inhale foreign small hard objects, causing damage to the fan or compressor blades. This phenomenon is called foreign object damage (FOD). The fatigue strength of the damaged blades decreases significantly, which may cause Serious aviation accident. In order to study the influence of foreign object damage on the fatigue strength of blades, in recent years, many scholars at home and abroad have carried out laboratory simulation of foreign object damage. The most widely used method at this stage is to use air cannons to fire hard objects to simulate aeroengine Impact damage from foreign objects on the blade. Since the size of the air cannon bore is fixed, in order to simulate the foreign object damage caused by hard objects of different shapes and sizes, the air cannon test system uses a bullet holder to carry ha...

AI Technical Summary

Problems solved by technology

In order to prevent additional damage to the test piece caused by the impact of the bullet holder, a fixed and rigid bullet holder separator is installed at the muzzle of the air gun. Causes the projectile to deviate when flying out of the muzzle, affecting the impact effect

And this kind of rigid collision will cause damage to the separator and barrel

In addition, due to the presence of a separator in the muzzle of a traditional air cannon, the impact damage to the position inside the narrow space (such as the narrow area formed by the twist angle of the blades and the overlapping of the spatial position in the blisk) will make it difficult for the muzzle to penetrate into this area , causing the muzzle to be far away from the expected damage location, resulting in inaccurate hitting locations

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