, Volume 40, Issue 1, pp 7-37

Investigation of water jet pulses generated by an impact piston device

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High speed water pulses for destruction of rock, concrete etc. have been studied for more than a decade. The high speed pulses can be created in different ways and some investigations have been published about supersonic pulse generators. In this paper a device called impact pipe is studied theoretically as well as experimentally. In an impact pipe the impact velocity of a piston is transferred to pressure in a pressure chamber provided with a small nozzle through which a jet comes out. It is shown that theoretically the maximum pressure of 400 MPa is achieved if the length of the impacting piston is sufficiently long. Pressure measurements and high speed photography show that the water pulse coming out through the nozzle has violent radial bursts due to the pressure waves in the pressure chamber.