The invention relates to a device for generating a pulsating fluid jet (16, 18) from fluid subjected to pressure. The device contains a line
system (36) having at least one
nozzle (38, 40), which has a
nozzle orifice (125), from which a fluid jet (16) of fluid subjected to pressure can exit. The device (20) has a chamber (22), in which a
pressure wave generation arrangement (24) for generating
fluid pressure waves (32) is constructed. The chamber (22) communicates with the line
system (36) through an exit opening (34) for the generated
fluid pressure waves (32). According to the invention, the device (20) contains an adjusting arrangement (31, 47, 62, 64) for controlling the amplitude AP of the
fluid pressure waves (22) in the line
system (36) upstream of the at least one
nozzle orifice (125). With the adjusting arrangement(31, 47, 62, 64), it is possible to adjust a Helmholtz number He:= L /
Lambda formed from the quotient of the
path length L for the fluid pressure waves(22) in the line system (36) between the exit opening (34) of the chamber (22) and the at least one nozzle orifice (125) of the at least one nozzle (38, 40), and the
wavelength Lambda of the fluid pressure waves (22) formed in the line system (36).