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A pulsating liquid jet gun, comprises, a housing which defines a cylinderbore having a small diameter portion defining a liquid chamber with an outer end having a discharge nozzle and an inner end which is connected to an intermediate diameter portion of a greater diameter than the smaller diameter

A pulsating liquid jet gun, comprises, a housing which defines a cylinderbore having a small diameter portion defining a liquid chamber with an outer end having a discharge nozzle and an inner end which is connected to an intermediate diameter portion of a greater diameter than the smaller diameter portion and it, in turn, is connected at its opposite end to a large diameter portion. A free piston has a first portion which is movable in the intermediate diameter portion and a second portion of small diameter in the first portion which is movable in the small diameter portion of the bore in sealing engagement therewith. An ignition piston has a first portion which is movable in the large diameter portion and a second portion of a smaller diameter which is movable in the large diameter portion and into and out of this intermediate diameter portion. The second portion of the ignition piston and the first portion of the free piston have opposed end faces in the intermediate diameter portion which define a combustion space therebetween. A mechanism is provided for periodically delivering a charge of liquid into the small diameter portion and, in addition, a mechanism is provided for periodically delivering apropellant charge to the combustion space and to cause the ignition of the propellant charge to generate hot reaction gases between the ignition piston and the free piston so as to cause relative displacement therebetween in respective opposite directions and to cause the expulsion of the liquid instantaneously through the nozzle under high force.

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A pulsating liquid jet gun, comprising, a cylinder having a cylinder bore with a combustion space for periodically receiving a propellant charge and a bore portion defining a liquid chamber, a free piston movable in said cylinder bore between said combustion space and said liquid chamber, means for

A pulsating liquid jet gun, comprising, a cylinder having a cylinder bore with a combustion space for periodically receiving a propellant charge and a bore portion defining a liquid chamber, a free piston movable in said cylinder bore between said combustion space and said liquid chamber, means for generating hot reaction gases by ignition of said propellant charge periodically in said combustion space, means for filling liquid into said liquid chamber prior to every ignition of said propellant charge, said means for generating hot reaction gases for causing ignition of the propellant charge being by an adiabatic compression thereof thermally initiating the ignition.