The piston serves to produce a pressure surge in a wind tunnel; it is moved in a suspended manner under the action of a gas pressure of at least 20 bar in a first tunnel from a starting position to an impact surface. A diaphragm at the end of the first tunnel breaks under the compression produced by the piston flying up; the pressure surge released as a result is directed to a foil through a second tunnel filled with test gas. The foil breaks and allows the test gas to flow as a shock wave in the supersonic range into a test chamber. The rear end of the piston has a locking extension which interacts with a fixed holder in the starting position. …IMAGE…
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