Pressure impulse generator - for research and testing of gaseous or liquid-contg. systems e.g. rocket motors

A device for generating press. impulses of selected magnitude for introducing disturbances in non-solid media has a first cylindrical driving tube, a conically constructed pipe section, connected to driving tube in an axial direction and a connecting tube axially connected to pipe section. A membrane separates driving tube from the other tubes. A piston can move inside driving tube from the other tubes. A piston stopping position along the axial direction and the piston is provided on the side facing the membrane with a needle which can pierce the membrane when the piston moves towards it. Openings, which can be closed, are provided in the wall fo driving tube, on either side of piston in its start position and enables predetermined vols. of gas to be introduced into the chambers to produce controllable pressures in the chambers. The device is used for examining the effects of impulses in pipelines, vessels and on the stability of burner systems, turbines, air jets, rocket motors, calibration of instruments with square wave form input and checking acoustic damping systems.