Method and apparatus for generating a sequence of beam portions of a discontinuous, modified liquid jet

The invention relates to a method and apparatus for generating a sequence of portions of a liquid jet (20), wherein a single beam portion (21) of the discontinuous, modified liquid jet (20) prior to impinging on a target surface (26) in the direction of movement (28) has smaller length (L) after exit from a nozzle (10). According to the invention, the modification by different speeds within the individual beam portion (21) of the discontinuous, modified liquid jet (20) is produced in such a way that, due to a steady increase in jet velocity at the exit from the nozzle (10) in the direction of movement (28) of rear beam portion obtains a front beam portion of the beam portion (21) by the individual beam portion (21) with increasing speed from the nozzle (10) emerges, the later it exits from the nozzle (10), and wherein a disruption of the earlier (to the beam portion 21 ) combined liquid is prevented by a critical ratio of inertial force to the surface power is not exceeded. Another aspect of the invention relates to the application of the inventive method for cleaning, surface treatment or cutting.