METHOD TO FORM TRAIN OF AIR IMPACT WAVES AND IMPACT PIPE FOR ITS REALISATION Russian patent published in 2013 - IPC G01M7/08 

FIELD: testing equipment.

SUBSTANCE: inventions may be used to create a train of air impact waves (AIW) in order to study AIW effect at various objects. The method consists in generation of an impact wave moving along a wave guide of an impact pipe and repetition of the specified cycle with the required time interval, and is implemented by the fact that a perforated disc and a membrane are installed in the wave guide of the impact wave with the possibility of the specified longitudinal displacement relative to each other, and the membrane is installed at the specified distance in front of the disc in direction of the outlet from the wave guide. Generation of the positive phase of the impact wave is carried out by disc speeding with further attachment of the membrane to it and their joint motion along the wave guide until stop in the extreme front position. Then additionally the negative phase is realised in the impact wave profile by means of disc displacement with the membrane in the reverse direction with sign-alternating acceleration until full stop in the extreme rear position, besides, before stop of the membrane with the disc in the extreme rear position they are again moved away from each other at the specified distance. The device comprises a wave guide with an impact wave generator installed on one end and a wave breaker installed on the opposite end. The impact wave generator is made in the form of a perforated disc and a membrane arranged in the wave guide as capable of displacement along it, a magazine with pyromechanical pushers installed at the end of the wave guide, and the pushers are arranged in it in a row in the vertical plane and are equipped with movable links, a stop and a return spring. The perforated disc at the rear side is equipped with a stem, which in turns contacts with movable links of the pyromechanical pushers. The membrane is installed in front of the disc in direction to the outlet from the wave guide with the possibility of its initial position fixation relative to the disc and variation of the distance between them. At the same time it is connected by mechanical links symmetrically stretching via perforation holes in the disc, with one end of the return spring, the other end of which is connected with a fixed support. The magazine is installed in guides at the end of the wave guide with the possibility of displacement along them downwards under its own weight until axes of the disc stem and the movable link of another pyromechanical pusher match. The stop is installed on one of the guides and is made as capable of limitation of magazine displacement until actuation of the next pusher. The stem of the disc at the side of the magazine may be equipped with a magnetic insert, and contacting movable links of pyromechanical pushers are at the same time made of a ferromagnetic material. The membrane may be made as multi-layer.

EFFECT: possibility to research reaction of various objects in laboratory conditions being exposed to air impact waves generated via specified intervals of time without contamination of working gas and environment with explosion products.

4 cl, 6 dwg